Document:

<PAGE>
                                                                    EXHIBIT 4.11

                              CERTIFICATE OF TRUST
                                       OF
                                 LENNOX TRUST II

         THIS CERTIFICATE OF TRUST of Lennox Trust II (the "Trust"), dated as of
January 23, 2003, is being duly executed and filed by the undersigned, as
trustees, with the Secretary of State of the State of Delaware to form a
statutory trust under the Delaware Statutory Trust Act (12 Del. Code Section
3801 et seq.) (the "Act").

         1. Name. The name of the statutory trust being formed hereby is "Lennox
Trust II".

         2. Delaware Trustee. The name and business address of the trustee of
the Trust with a principal place of business in the State of Delaware are The
Bank of New York (Delaware), 700 White Clay Center, Route 273, Newark, Delaware
19711.

         3. Effective Date. This Certificate of Trust shall be effective at the
time of its filing with the Secretary of State of the State of Delaware.

         4. Counterparts. This Certificate of Trust may be executed in one or
more counterparts.

<PAGE>

         IN WITNESS WHEREOF, the undersigned, being all of the trustees of the
Trust at the time of filing this Certificate of Trust, have executed this
Certificate of Trust as of the date first above written pursuant to Section
3811(a) of the Act.

                                   THE BANK OF NEW YORK (DELAWARE),
                                   not in its individual capacity but solely
                                   as Delaware Trustee

                                   By:  /s/ William T. Lewis
                                        ----------------------------------------
                                           Name:  William T. Lewis
                                           Title:  Senior Vice President

                                   THE BANK OF NEW YORK,
                                   not in its individual capacity but solely
                                   as Property Trustee

                                   By:  /s/ Beata Hryniewicka
                                        ----------------------------------------
                                           Name:  Beata Hryniewicka
                                           Title:  Assistant Treasurer

                                   RICHARD A. SMITH,
                                   not in his individual capacity,
                                   but solely as Regular Trustee

                                   /s/ Richard A. Smith
                                   ---------------------------------------------<PAGE>
                                                                    EXHIBIT 4.13

================================================================================

                                     FORM OF

                            LENNOX INTERNATIONAL INC.

                               GUARANTEE AGREEMENT

                              LENNOX TRUST [I] [II]

                        ---------------------------------

                         DATED AS OF ________ ___, ____

                        ---------------------------------

================================================================================

<PAGE>

                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                               PAGE
                                                                                                               ----
<S>                                                                                                            <C>
ARTICLE I           DEFINITIONS...................................................................................1
      SECTION 1.1          Definitions............................................................................1

ARTICLE II          TRUST INDENTURE ACT...........................................................................5
      SECTION 2.1          Trust Indenture Act; Application.......................................................5
      SECTION 2.2          Lists of Holders of Preferred Securities...............................................5
      SECTION 2.3          Reports by the Guarantee Trustee.......................................................5
      SECTION 2.4          Periodic Reports to the Guarantee Trustee..............................................6
      SECTION 2.5          Evidence of Compliance with Conditions Precedent.......................................6
      SECTION 2.6          Events of Default; Waiver..............................................................6
      SECTION 2.7          Disclosure of Information..............................................................6
      SECTION 2.8          Conflicting Interest...................................................................7

ARTICLE III         POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE............................................7
      SECTION 3.1          Powers and Duties of the Guarantee Trustee.............................................7
      SECTION 3.2          Certain Rights and Duties of the Guarantee Trustee.....................................8
      SECTION 3.3          Not Responsible for Issuance of Guarantee.............................................10
      SECTION 3.4          The Guarantee Trustee May Own Preferred Securities....................................10
      SECTION 3.5          Moneys Received by the Guarantee Trustee to Be Held in Trust Without Interest.........10
      SECTION 3.6          Compensation, Expenses and Indemnification of Guarantee Trustee.......................10

ARTICLE IV          GUARANTEE TRUSTEE............................................................................11
      SECTION 4.1          Qualifications........................................................................11
      SECTION 4.2          Appointment, Removal and Resignation of the Guarantee Trustee.........................11

ARTICLE V           GUARANTEE....................................................................................12
      SECTION 5.1          Guarantee.............................................................................12
      SECTION 5.2          Waiver of Notice......................................................................12
      SECTION 5.3          Obligations Not Affected..............................................................12
      SECTION 5.4          Enforcement of Guarantee..............................................................13
      SECTION 5.5          Guarantee of Payment..................................................................14
      SECTION 5.6          Subrogation...........................................................................14
      SECTION 5.7          Independent Obligations...............................................................14

ARTICLE VI          LIMITATION OF TRANSACTIONS; SUBORDINATION....................................................14
      SECTION 6.1          Limitation of Transactions............................................................14
      SECTION 6.2          Subordination.........................................................................15

ARTICLE VII         TERMINATION..................................................................................15
      SECTION 7.1          Termination...........................................................................15
</Table>

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<Table>
<S>                                                                                                            <C>
ARTICLE VIII        LIMITATION OF LIABILITY; INDEMNIFICATION.....................................................16
      SECTION 8.1          Exculpation...........................................................................16
      SECTION 8.2          Indemnification.......................................................................16
      SECTION 8.3          Survive Termination...................................................................16

ARTICLE IX          MISCELLANEOUS................................................................................17
      SECTION 9.1          Successors and Assigns................................................................17
      SECTION 9.2          Amendments............................................................................17
      SECTION 9.3          Notices...............................................................................17
      SECTION 9.4          Genders...............................................................................18
      SECTION 9.5          Benefit...............................................................................18
      SECTION 9.6          Governing Law.........................................................................18
      SECTION 9.7          Counterparts..........................................................................18
      SECTION 9.8          [Exercise of Over-allotment Option]...................................................18
</Table>

                                       ii
<PAGE>

                               GUARANTEE AGREEMENT

                  This GUARANTEE AGREEMENT, dated as of ___________, ____, is
executed and delivered by Lennox International Inc., a Delaware corporation (the
"Guarantor"), and The Bank of New York, a New York banking corporation, as the
initial Guarantee Trustee (as defined herein) for the benefit of the Holders (as
defined herein) from time to time of the Preferred Securities (as defined
herein) of Lennox Trust [I] [II], a Delaware statutory trust (the "Issuer").

                  WHEREAS, pursuant to an Amended and Restated Declaration of
Trust (the "Declaration"), dated as of __________, ____, among the trustees of
the Issuer named therein, Lennox International Inc., as Sponsor, and the Holders
from time to time of preferred undivided beneficial interests in the assets of
the Issuer, the Issuer may issue up to $___________ aggregate liquidation amount
of its ___% [[Convertible] Trust Preferred Securities] (the "Preferred
Securities") representing preferred undivided beneficial interests in the assets
of the Issuer and having the terms set forth in the Declaration[, of which
$__________ liquidation amount of Preferred Securities is being issued as of the
date hereof. Up to the remaining $__________ liquidation amount of Preferred
Securities may be issued by the Issuer if and to the extent that the
over-allotment option granted by the Guarantor and the Issuer pursuant to the
Underwriting Agreement (as defined in the Declaration) is exercised by the
underwriters named in the Underwriting Agreement]; and

                  WHEREAS, as incentive for the Holders to purchase Preferred
Securities, the Guarantor desires to irrevocably and unconditionally agree, to
the extent set forth herein, to pay to the Holders the Guarantee Payments (as
defined herein) and to make certain other payments on the terms and conditions
set forth herein;

                  NOW, THEREFORE, in consideration of the purchase by the
initial purchasers thereof of Preferred Securities, which purchase the Guarantor
hereby agrees shall benefit the Guarantor, the Guarantor executes and delivers
this Guarantee Agreement for the benefit of the Holders from time to time.

                                   ARTICLE I
                                   DEFINITIONS

         SECTION 1.1 Definitions.

                  (a) Capitalized terms used in this Guarantee Agreement but not
defined in the preamble or recitals above have the respective meanings assigned
to them in this Section 1.1.

                  (b) A term defined anywhere in this Guarantee Agreement has
the same meaning throughout.

                  (c) All references to "the Guarantee Agreement" or "this
Guarantee Agreement" are to this Guarantee Agreement as modified, supplemented
or amended from time to time.

                                       1
<PAGE>

                  (d) All references in this Guarantee Agreement to Articles and
Sections are to Articles and Sections of this Guarantee Agreement unless
otherwise specified.

                  (e) A term defined in the Trust Indenture Act has the same
meaning when used in this Guarantee Agreement unless otherwise defined in this
Guarantee Agreement or unless the context otherwise requires.

                  (f) A reference to the singular includes the plural and vice
versa.

                  "Affiliate" of any specified Person means any other Person
directly or indirectly controlling or controlled by, or under direct or indirect
common control with, such specified Person. For the purposes of this definition,
"control" of a Person shall mean the power to direct the management and policies
of such Person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise, and the terms "controlling" and
"controlled" shall have meanings correlative to the foregoing.

                  "Commission" means the Securities and Exchange Commission.

                  "Common Securities" means the securities representing common
undivided beneficial interests in the assets of the Issuer and having the terms
set forth in the Declaration.

                  "Debenture Trustee" means The Bank of New York, a New York
banking corporation, as trustee under the Indenture until a successor is
appointed thereunder and thereafter means such successor trustee.

                  "Debentures" means the series of [convertible] unsecured
[senior] [junior] [subordinated] debentures issued to the Property Trustee by
the Guarantor under the Indenture and entitled the "___% [Convertible] [Senior]
[Junior] [Subordinated] Debentures due ____."

                  "Declaration" has the meaning set forth in the recitals above.

                  "Declaration Event of Default" means any Event of Default as
defined in the Declaration.

                  "Distributions" means the periodic distributions and other
payments payable to Holders in accordance with the terms of the Preferred
Securities set forth in Article 6.01 of the Declaration.

                  "Event of Default" means a default by the Guarantor on any of
its payment or other obligations under this Guarantee Agreement; provided,
however, that, except with respect to a default in payment of any Guarantee
Payment, any such default shall constitute an Event of Default only if the
Guarantor shall have received notice of such default and shall not have cured
such default within 60 days after receipt of such notice.

                  "Extension Period" has the meaning set forth in Section ___ of
the Supplemental Indenture.

                                       2
<PAGE>

                  "Guarantee Payments" means the following payments or
distributions, without duplication, with respect to the Preferred Securities, to
the extent not paid or made by or on behalf of the Issuer: (i) any accumulated
and unpaid Distributions and the Redemption Price, including all accumulated and
unpaid Distributions to the date of redemption, with respect to the Preferred
Securities called for redemption by the Issuer, but only if and to the extent
that in each case the Guarantor has made a payment to the Property Trustee of
principal of, or any premium or interest on, the Debentures, and (ii) upon a
voluntary or involuntary dissolution, winding-up or termination of the Issuer
(other than in connection with the distribution of the Debentures to Holders in
exchange for Preferred Securities or the redemption of the Preferred Securities
in full upon the maturity or redemption of the Debentures as provided in the
Declaration), the lesser of (a) the aggregate of the liquidation amount and all
accumulated and unpaid Distributions on the Preferred Securities to the date of
payment, to the extent the Issuer has funds on hand legally available therefor,
and (b) the amount of assets of the Issuer remaining available for distribution
to Holders in liquidation of the Issuer as required by applicable law.

                  "Guarantee Trustee" means The Bank of New York, a New York
banking corporation, until a Successor Guarantee Trustee has been appointed and
has accepted such appointment pursuant to the terms of this Guarantee Agreement,
and thereafter means each such Successor Guarantee Trustee.

                  "Guarantor" has the meaning set forth in the preamble above.

                  "Holder" means any holder, as registered on the books and
records of the Issuer, of any Preferred Securities; provided, however, that in
determining whether the holders of the requisite percentage of Preferred
Securities have given any request, notice, consent or waiver hereunder, "Holder"
shall not include the Guarantor or any Affiliate of the Guarantor.

                  "Indemnified Person" means the Guarantee Trustee, any
Affiliate of the Guarantee Trustee, and any officers, directors, shareholders,
members, partners, employees, representatives or agents of the Guarantee
Trustee.

                  "Indenture" means the Indenture, dated as of _____________,
____, between Lennox International Inc. and the Debenture Trustee, as
supplemented by the Supplemental Indenture.

                  "Issuer" has the meaning set forth in the preamble above.

                  "Majority in liquidation amount of the Preferred Securities"
means Holder(s) of outstanding Preferred Securities, voting together as a single
class, who are the record owners of Preferred Securities whose liquidation
amount (including the stated amount that would be paid on redemption,
liquidation or otherwise, plus accumulated and unpaid Distributions to the date
upon which the voting percentages are determined) represents more than 50% of
the liquidation amount of all outstanding Preferred Securities.

                  "Officers' Certificate" means, with respect to any Person, a
certificate signed by any two of the Chairman of the Board, the President, any
Vice Chairman of the Board, any Vice President, the Chief Financial Officer, the
Treasurer, any Assistant Treasurer, the Controller, the Secretary or any
Assistant Secretary of such Person, and delivered to the Guarantee Trustee.

                                       3
<PAGE>

One of the officers signing an Officers' Certificate given pursuant to Section
2.4 shall be the principal executive, financial or accounting officer of the
Guarantor. Any Officers' Certificate delivered with respect to compliance with a
condition or covenant provided for in this Guarantee Agreement shall include:

                  (a) a statement that each officer making such certificate has
         read such covenant or condition;

                  (b) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate are based;

                  (c) a statement that, in the opinion of such officer, he or
         she has made such examination or investigation as is necessary to
         enable him or her to express an informed opinion as to whether or not
         such covenant or condition has been complied with; and

                  (d) a statement as to whether or not, in the opinion of such
         officer, such covenant or condition has been complied with.

                  "List of Holders" has the meaning set forth in Section 2.2(a).

                  "Person" means any individual, corporation, partnership,
limited liability company, joint venture, incorporated or unincorporated
association, joint stock company, trust, unincorporated organization or
government or other agency, instrumentality or political subdivision thereof or
other entity of any kind.

                  "Preferred Securities" has the meaning set forth in the
recitals above.

                  "Property Trustee" means the Person acting as Property Trustee
under the Declaration.

                  "Redemption Price" means the amount payable on redemption of
the Preferred Securities in accordance with the terms of the Preferred
Securities.

                  "Resignation Request" has the meaning set forth in Section
4.2(d).

                  "Responsible Officer" means, when used with respect to the
Guarantee Trustee, any officer within the corporate trust department of the
Guarantee Trustee, including any vice president, assistant vice president,
assistant secretary, assistant treasurer, trust officer or any other officer of
the Guarantee Trustee who customarily performs functions similar to those
performed by the Persons who at the time shall be such officers, respectively,
or to whom any corporate trust matter is referred because of such Person's
knowledge of and familiarity with the particular subject and who shall have
direct responsibility for the administration of this Guarantee Agreement.

                  "Successor Guarantee Trustee" means a successor Guarantee
Trustee possessing the qualifications to act as a Guarantee Trustee under
Section 4.1.

                                       4
<PAGE>

                  "Supplemental Indenture" means the _____ Supplemental
Indenture, dated as of ______________, _____, between the Guarantor and the
Debenture Trustee, or any officers' certificate or other writing under the
Indenture, in each case establishing the form and terms of the Debentures as
permitted by Section 2.01 of the Indenture.

                  "Trust Indenture Act" means the Trust Indenture Act of 1939,
as amended.

                                   ARTICLE II
                               TRUST INDENTURE ACT

         SECTION 2.1 Trust Indenture Act; Application.

                  (a) This Guarantee Agreement is subject to the provisions of
the Trust Indenture Act that are required to be part of this Guarantee Agreement
and shall, to the extent applicable, be governed by such provisions.

                  (b) If and to the extent that any provision of this Guarantee
Agreement limits, qualifies or conflicts with the duties imposed by Sections 310
to 317, inclusive, of the Trust Indenture Act, such imposed duties shall
control.

                  (c) The application of the Trust Indenture Act to this
Guarantee Agreement shall not affect the nature of the Preferred Securities as
equity securities representing preferred undivided beneficial interests in the
assets of the Issuer.

        SECTION 2.2 Lists of Holders of Preferred Securities.

                  (a) The Guarantor shall provide the Guarantee Trustee, unless
the Guarantee Trustee is registrar for the Preferred Securities, (i) on each
regular record date for payment of Distributions, a list, in such form as the
Guarantee Trustee may reasonably require, of the names and addresses of the
Holders ("List of Holders") as of such record date, and (ii) at any other time,
within 30 days of receipt by the Guarantor of a written request from the
Guarantee Trustee for a List of Holders, a List of Holders as of a date no more
than 15 days before such List of Holders is given to the Guarantee Trustee;
provided that in each case the Guarantor shall not be obligated to provide such
List of Holders at any time that the List of Holders does not differ from the
most recent List of Holders given to the Guarantee Trustee by the Guarantor. The
Guarantee Trustee shall preserve, in as current a form as is reasonably
practicable, all information contained in the Lists of Holders given to it;
provided that the Guarantee Trustee may destroy any List of Holders previously
given to it on receipt of a new List of Holders.

                  (b) The Guarantee Trustee shall comply with its obligations
under Section 312(b) of the Trust Indenture Act.

        SECTION 2.3 Reports by the Guarantee Trustee.

                  Within 60 days after May 15 of each year, commencing May 15,
_____, the Guarantee Trustee shall deliver to the Holders such reports as are
required by Section 313 of the Trust Indenture Act, if any, in the form, in the
manner and at the times provided by Section 313 of the Trust Indenture Act. The
Guarantee Trustee shall also comply with the other requirements of Section 313
of

                                       5
<PAGE>

the Trust Indenture Act. A copy of each such report shall, at the time of such
transmission to the Holders, be filed by the Guarantee Trustee with the
Guarantor, with each stock exchange, automated quotation system or
over-the-counter market upon which any Preferred Securities are listed or traded
(if so listed or traded) and also with the Commission. The Guarantor agrees to
notify the Guarantee Trustee when any Preferred Securities become listed or
traded on any such exchange, quotation system or market and of any delisting
thereof.

        SECTION 2.4 Periodic Reports to the Guarantee Trustee.

                  The Guarantor shall provide to the Guarantee Trustee, the
Commission and the Holders, as applicable, such documents, reports and
information (if any) as required by Section 314(a)(1)-(3) of the Trust Indenture
Act and the compliance certificates required by Section 314(a)(4) and (c) of the
Trust Indenture Act, any such certificates to be provided in the form, in the
manner and at the times required by Section 314(a)(4) and (c) of the Trust
Indenture Act; provided that any certificate to be provided pursuant to Section
314(a)(4) of the Trust Indenture Act shall be provided within 120 days of the
end of each fiscal year of the Issuer. Delivery of such reports, information and
documents to the Guarantee Trustee is for informational purposes only and the
Guarantee Trustee's receipt thereof shall not constitute constructive notice of
any information contained therein, including the Guarantor's compliance with any
of its covenants hereunder (as to which the Guarantee Trustee is entitled to
rely exclusively on Officers' Certificates or on certificates provided pursuant
to this Section 2.4).

        SECTION 2.5 Evidence of Compliance with Conditions Precedent.

                  The Guarantor shall provide to the Guarantee Trustee such
evidence of compliance with any conditions precedent provided for in this
Guarantee Agreement which relate to any of the matters set forth in Section
314(c) of the Trust Indenture Act. Any certificate or opinion required to be
given by an officer pursuant to Section 314(c) may be given in the form of an
Officers' Certificate.

        SECTION 2.6 Events of Default; Waiver.

                  (a) The Holders of a Majority in liquidation amount of the
Preferred Securities may, by vote, on behalf of the Holders, waive any past
Event of Default and its consequences. Upon such waiver, any such Event of
Default shall cease to exist, and any Event of Default arising therefrom shall
be deemed to have been cured, for every purpose of this Guarantee Agreement, but
no such waiver shall extend to any subsequent or other default or Event of
Default or impair any right consequent thereon.

                  (b) The right of any Holder to receive payment of the
Guarantee Payments in accordance with this Guarantee Agreement, or to institute
suit for the enforcement of any such payment, shall not be impaired without the
consent of each such Holder.

        SECTION 2.7 Disclosure of Information.

                  The disclosure of information as to the names and addresses of
the Holders in accordance with Section 312 of the Trust Indenture Act,
regardless of the source from which such information was derived, shall not be
deemed to be a violation of any existing law, or any law

                                       6
<PAGE>

hereafter enacted which does not specifically refer to Section 312 of the Trust
Indenture Act, nor shall the Guarantee Trustee be held accountable by reason of
mailing any material pursuant to a request made under Section 312(b) of the
Trust Indenture Act.

             SECTION 2.8 Conflicting Interest.

                  (a) The Declaration and the Indenture shall be deemed to be
specifically described in this Guarantee Agreement for the purposes of clause
(i) of the first proviso contained in Section 310(b) of the Trust Indenture Act.

                  (b) The Guarantee Trustee shall comply with its obligations
under Sections 310(b) and 311 of the Trust Indenture Act.

                                  ARTICLE III
               POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE

        SECTION 3.1 Powers and Duties of the Guarantee Trustee.

                  (a) This Guarantee Agreement shall be held by the Guarantee
Trustee in trust for the benefit of the Holders. The Guarantee Trustee shall not
transfer its right, title and interest in this Guarantee Agreement to any Person
except a Successor Guarantee Trustee on acceptance by such Successor Guarantee
Trustee of its appointment to act as Guarantee Trustee or to a Holder exercising
his or her rights pursuant to Section 5.4(iv). The right, title and interest of
the Guarantee Trustee to this Guarantee Agreement shall vest automatically in
each Person who may hereafter be appointed as Guarantee Trustee in accordance
with Article IV. Such vesting and cessation of title shall be effective whether
or not conveyancing documents have been executed and delivered.

                  (b) If an Event of Default has occurred and is continuing, the
Guarantee Trustee shall enforce this Guarantee Agreement for the benefit of the
Holders.

                  (c) This Guarantee Agreement and all moneys received by the
Guarantee Trustee in respect of the Guarantee Payments will not be subject to
any right, charge, security interest, lien or claim of any kind in favor of, or
for the benefit of, the Guarantee Trustee or its agents or their creditors.

                  (d) The Guarantee Trustee shall, within 90 days after the
occurrence of an Event of Default actually known to a Responsible Officer of the
Guarantee Trustee, transmit by mail, first class postage prepaid, to the
Holders, as their names and addresses appear upon the List of Holders, notice of
such Event of Default, unless such Event of Default shall have been cured before
the giving of such notice; provided that the Guarantee Trustee shall be
protected in withholding such notice if and so long as a committee of
Responsible Officers of the Guarantee Trustee in good faith determines that the
withholding of such notice is in the interests of the Holders. The Guarantee
Trustee shall not be deemed to have knowledge of any Event of Default except any
Event of Default as to which the Guarantee Trustee shall have received written
notice or a Responsible Officer charged with the administration of this
Guarantee Agreement shall have obtained written notice of such Event of Default.

                                       7
<PAGE>

                  (e) The Guarantee Trustee shall continue to serve as a trustee
until a Successor Guarantee Trustee has been appointed and accepted that
appointment in accordance with Article IV.

        SECTION 3.2 Certain Rights and Duties of the Guarantee
Trustee.

                  (a) The Guarantee Trustee, before the occurrence of an Event
of Default and after the curing or waiving of all Events of Default that may
have occurred, shall undertake to perform only such duties as are specifically
set forth in this Guarantee Agreement, and no implied covenants shall be read
into this Guarantee Agreement against the Guarantee Trustee. In case an Event of
Default has occurred (that has not been cured or waived pursuant to Section
2.6), the Guarantee Trustee shall exercise such of the rights and powers vested
in it by this Guarantee Agreement, and use the same degree of care and skill in
its exercise thereof, as a prudent person would exercise or use under the
circumstances in the conduct of his own affairs.

                  (b) No provision of this Guarantee Agreement shall be
construed to relieve the Guarantee Trustee from liability for its own negligent
action, its own negligent failure to act or its own willful misconduct, except
that:

                      (1) prior to the occurrence of an Event of Default and
         after the curing or waiving of all such Events of Default that may have
         occurred:

                           (A) the duties and obligations of the Guarantee
                  Trustee shall be determined solely by the express provisions
                  of this Guarantee Agreement, and the Guarantee Trustee shall
                  not be liable except for the performance of such duties and
                  obligations as are specifically set forth in this Guarantee
                  Agreement, and no implied covenants or obligations shall be
                  read into this Guarantee Agreement against the Guarantee
                  Trustee; and

                           (B) in the absence of bad faith on the part of the
                  Guarantee Trustee, the Guarantee Trustee may conclusively
                  rely, as to the truth of the statements and the correctness of
                  the opinions expressed therein, upon any certificates or
                  opinions furnished to the Guarantee Trustee and conforming to
                  the requirements of this Guarantee Agreement; provided,
                  however, that in the case of any such certificates or opinions
                  that by any provision hereof or the Trust Indenture Act are
                  specifically required to be furnished to the Guarantee
                  Trustee, the Guarantee Trustee shall be under a duty to
                  examine the same to determine whether or not they conform to
                  the requirements of this Guarantee Agreement or the Trust
                  Indenture Act, as the case may be;

                      (2) the Guarantee Trustee shall not be liable for any
         error of judgment made in good faith by a Responsible Officer of the
         Guarantee Trustee, unless it shall be proved that the Guarantee Trustee
         was negligent in ascertaining the pertinent facts upon which such
         judgment was based;

                      (3) the Guarantee Trustee shall not be liable with respect
         to any action taken or omitted to be taken by it in good faith in
         accordance with the direction of the Holders of a Majority in
         liquidation amount of the Preferred Securities relating to the time,

                                       8
<PAGE>

         method and place of conducting any proceeding for any remedy available
         to the Guarantee Trustee, or exercising any trust or power conferred
         upon the Guarantee Trustee, under this Guarantee Agreement; and

                      (4) no provision of this Guarantee Agreement shall require
         the Guarantee Trustee to expend or risk its own funds or otherwise
         incur personal financial liability in the performance of any of its
         duties or in the exercise of any of its rights or powers, if it shall
         have reasonable grounds for believing that the repayment of such funds
         or liability is not reasonably assured to it under the terms of this
         Guarantee Agreement or adequate indemnity against such risk or
         liability is not reasonably assured to it.

                  (c) Subject to the provisions of Section 3.2(a) and (b):

                      (1) whenever in the administration of this Guarantee
         Agreement, the Guarantee Trustee shall deem it necessary or desirable
         that a matter be proved or established prior to taking, suffering or
         omitting any action hereunder, the Guarantee Trustee (unless other
         evidence is herein specifically prescribed) may, in the absence of
         negligence or bad faith on its part, request and conclusively rely upon
         an Officers' Certificate which, upon receipt of such request, shall be
         promptly delivered by the Guarantor; and such Officers' Certificate, in
         the absence of negligence or bad faith on the part of the Guarantee
         Trustee, shall be full warrant to the Guarantee Trustee for any action
         taken, suffered or omitted under the provisions of this Guarantee
         Agreement upon the faith thereof;

                      (2) the Guarantee Trustee (A) may consult with counsel
         (which may be counsel to the Guarantor or any of its Affiliates and may
         include any of its employees) selected by it in good faith and with due
         care and the advice or opinion of such counsel with respect to legal
         matters shall be full and complete authorization and protection in
         respect of any action taken, suffered or omitted by it hereunder in
         good faith and in reliance thereon and in accordance with such advice
         and opinion and (B) shall have the right at any time to seek
         instructions concerning the administration of this Guarantee Agreement
         from any court of competent jurisdiction;

                      (3) the Guarantee Trustee may exercise any of the trusts
         or powers hereunder or perform any duties hereunder either directly or
         by or through agents or attorneys, and the Guarantee Trustee shall not
         be responsible for any misconduct or negligence on the part of any
         agent or attorney appointed by it in good faith and with due care;

                      (4) the Guarantee Trustee shall be under no obligation to
         exercise any of the rights or powers vested in it by this Guarantee
         Agreement at the request or direction of any Holder, unless such Holder
         shall have offered to the Guarantee Trustee security and indemnity
         satisfactory to the Guarantee Trustee against the costs, expenses
         (including attorneys' fees and expenses) and liabilities that might be
         incurred by it in complying with such request or direction; provided
         that nothing contained in this clause (iv) shall relieve the Guarantee
         Trustee of the obligation, upon the occurrence of an Event of Default
         (which has not been cured or waived) to exercise such of the rights and
         powers

                                       9
<PAGE>

         vested in it by this Guarantee Agreement, and to use the same degree of
         care and skill in this exercise, as a prudent person would exercise or
         use under the circumstances in the conduct of such person's own
         affairs; and

                      (5) any action taken by the Guarantee Trustee or its
         agents hereunder shall bind the Holders, and the signature of the
         Guarantee Trustee or its agents alone shall be sufficient and effective
         to perform any such action; and no third party shall be required to
         inquire as to the authority of the Guarantee Trustee to so act, or as
         to its compliance with any of the terms and provisions of this
         Guarantee Agreement, both of which shall be conclusively evidenced by
         the Guarantee Trustee's or its agent's taking such action.

        SECTION 3.3 Not Responsible for Issuance of Guarantee.

                  The Guarantee Trustee makes no representations as to the
validity or sufficiency of this Guarantee Agreement.

        SECTION 3.4 The Guarantee Trustee May Own Preferred Securities.

                  The Guarantee Trustee, in its individual or any other
capacity, may become the owner or pledgee of Preferred Securities and, subject
to the provisions of Section 4.1, may otherwise deal with the Guarantor with the
same rights it would have if it were not the Guarantee Trustee.

        SECTION 3.5 Moneys Received by the Guarantee Trustee to Be Held in
Trust Without Interest.

                  All moneys received by the Guarantee Trustee in respect of
Guarantee Payments shall, until used or applied as herein provided, be held in
trust for the purposes for which they were received, but need not be segregated
from other funds except to the extent required by law. The Guarantee Trustee
shall be under no liability for interest on any moneys received by it hereunder
except such as it may agree in writing to pay thereon.

        SECTION 3.6 Compensation, Expenses and Indemnification of Guarantee
Trustee.

                  The Guarantor covenants and agrees to pay to the Guarantee
Trustee from time to time, and the Guarantee Trustee shall be entitled to, such
compensation as the Guarantor and the Guarantee Trustee shall from time to time
agree in writing (which shall not be limited by any provision of law in regard
to the compensation of a Guarantee Trustee of an express trust) for all services
rendered by it in the execution of the trusts hereby created and in the exercise
and performance of any of the powers and duties hereunder of the Guarantee
Trustee, and the Guarantor will pay or reimburse the Guarantee Trustee upon its
request for all reasonable expenses, disbursements and advances incurred or made
by the Guarantee Trustee in accordance with any of the provisions of this
Guarantee Agreement (including the reasonable compensation and the reasonable
expenses and disbursements of its counsel and of all persons not regularly in
its employ) except any such expense, disbursement or advance as may arise from
its negligence or bad faith. The Guarantor also covenants to indemnify each of
the Guarantee Trustee or any predecessor Guarantee Trustee and their officers,
agents, directors and employees for, and to hold them harmless against, any and
all loss, liability, damage, claim or expense, including taxes

                                       10
<PAGE>

(other than taxes based upon, measured by or determined by the income, profit or
franchise of or doing business by the Guarantee Trustee), incurred without
negligence or bad faith on the part of the Guarantee Trustee and arising out of
or in connection with the acceptance or administration of this trust, including
the reasonable costs and expenses of defending itself against any claim (whether
asserted by the Guarantor, any Holder or any other Person) of liability in the
premises. The provisions of this Section 3.6 shall survive the termination of
this Guarantee Agreement and resignation or removal of the Guarantee Trustee.

                                   ARTICLE IV
                                GUARANTEE TRUSTEE

        SECTION 4.1 Qualifications.

                  There shall at all times be a Guarantee Trustee that shall:

                  (a) not be an Affiliate of the Guarantor; and

                  (b) be a corporation or national banking association organized
         and doing business under the laws of the United States of America or
         any State or Territory thereof or of the District of Columbia, or a
         corporation, national banking association or Person permitted by the
         Commission to act as an institutional trustee under the Trust Indenture
         Act, authorized under such laws to exercise corporate trust powers,
         having a combined capital and surplus of at least $50,000,000, and
         subject to supervision or examination by U.S. federal, state,
         territorial or District of Columbia authority. If such corporation or
         national banking association publishes reports of condition at least
         annually, pursuant to law or to the requirements of the supervising or
         examining authority referred to above, then for the purposes of this
         clause (ii), the combined capital and surplus of such corporation shall
         be deemed to be its combined capital and surplus as set forth in its
         most recent report of condition so published.

                  If at any time the Guarantee Trustee shall cease to satisfy
the requirements of clauses (i) and (ii) above, the Guarantee Trustee shall
immediately resign in the manner and with the effect set out in Section 4.2. If
the Guarantee Trustee has or shall acquire any "conflicting interest" within the
meaning of Section 310(b) of the Trust Indenture Act, the Guarantee Trustee and
the Guarantor shall in all respects comply with the provisions of Section 310(b)
of the Trust Indenture Act.

        SECTION 4.2 Appointment, Removal and Resignation of the Guarantee
Trustee.

                  (a) Subject to Section 4.2(b), the Guarantee Trustee may be
appointed or removed without cause at any time by the Guarantor.

                  (b) The Guarantee Trustee shall not be removed in accordance
with Section 4.2(a) until a Successor Guarantee Trustee possessing the
qualifications to act as Guarantee Trustee under Section 4.1 has been appointed
and has accepted such appointment by written instrument executed by such
Successor Guarantee Trustee and delivered to the Guarantor and the Guarantee
Trustee being removed.

                                       11
<PAGE>

                  (c) The Guarantee Trustee appointed to office shall hold
office until its successor shall have been appointed or until its removal or
resignation.

                  (d) The Guarantee Trustee may resign from office (without need
for prior or subsequent accounting) by an instrument (a "Resignation Request")
in writing signed by the Guarantee Trustee and delivered to the Guarantor, which
resignation shall take effect upon such delivery or upon such later date as is
specified therein; provided, however, that no such resignation of the Guarantee
Trustee shall be effective until a Successor Guarantee Trustee possessing the
qualifications to act as Guarantee Trustee under Section 4.1 has been appointed
and has accepted such appointment by instrument executed by such Successor
Guarantee Trustee and delivered to the Guarantor and the resigning Guarantee
Trustee.

                  (e) If no Successor Guarantee Trustee shall have been
appointed and accepted appointment as provided in this Section 4.2 within 60
days after delivery to the Guarantor of a Resignation Request or receipt of a
notice of removal by the Guarantee Trustee, the Guarantee Trustee being removed
or resigning may, at the expense of the Guarantor, petition any court of
competent jurisdiction for appointment of a Successor Guarantee Trustee. Such
court may thereupon after prescribing such notice, if any, as it may deem proper
and prescribe, appoint a Successor Guarantee Trustee.

                                   ARTICLE V
                                    GUARANTEE

        SECTION 5.1 Guarantee.

                  The Guarantor irrevocably and unconditionally agrees to pay in
full to the Holders the Guarantee Payments (without duplication of amounts
theretofore paid by the Issuer), as and when due, regardless of any defense,
right of set-off or counterclaim which the Issuer may have or assert. The
Guarantor's obligation to make a Guarantee Payment may be satisfied by direct
payment of the required amounts by the Guarantor to the Holders or to the
Guarantee Trustee for remittance to the Holders or by causing the Issuer to pay
such amounts to the Holders.

        SECTION 5.2 Waiver of Notice.

                  The Guarantor hereby waives notice of acceptance of this
Guarantee Agreement and of any liability to which it applies or may apply,
presentment, demand for payment, any right to require a proceeding first against
the Issuer or any other Person before proceeding against the Guarantor, protest,
notice of nonpayment, notice of dishonor, notice of redemption and all other
notices and demands. Notwithstanding anything to the contrary herein, the
Guarantor retains all of its rights under the Indenture to extend the interest
payment period on the Debentures and the Guarantor shall not be obligated
hereunder to make any Guarantee Payment during any Extension Period with respect
to the Distributions on the Preferred Securities.

        SECTION 5.3 Obligations Not Affected.

                  The obligations, covenants, agreements and duties of the
Guarantor under this Guarantee Agreement shall in no way be affected or impaired
by reason of the happening from time to time of any of the following:

                                       12
<PAGE>

                  (a) the release or waiver, by operation of law or otherwise,
         of the performance or observance by the Issuer of any express or
         implied agreement, covenant, term or condition relating to the
         Preferred Securities to be performed or observed by the Issuer;

                  (b) the extension of time for the payment by the Issuer of all
         or any portion of the Distributions (other than an extension of time
         for payment of Distributions that result from any Extension Period),
         Redemption Price, Liquidation Distribution (as defined in the
         Declaration) or any other sums payable under the terms of the Preferred
         Securities or the extension of time for the performance of any other
         obligation under, arising out of, or in connection with, the Preferred
         Securities (other than an extension of time for payment of
         Distributions that result from any Extension Period);

                  (c) any failure, omission, delay or lack of diligence on the
         part of the Guarantee Trustee or the Holders to enforce, assert or
         exercise any right, privilege, power or remedy conferred on the
         Guarantee Trustee or the Holders pursuant to the terms hereof or of the
         Preferred Securities, respectively, or any action on the part of the
         Issuer granting indulgence or extension of any kind;

                  (d) the voluntary or involuntary liquidation, dissolution,
         sale of any collateral, receivership, insolvency, bankruptcy,
         assignment for the benefit of creditors, reorganization, arrangement,
         composition or readjustment of debt of, or other similar proceedings
         affecting, the Issuer or any of the assets of the Issuer;

                  (e) any invalidity of, or defect or deficiency in, the
         Preferred Securities;

                  (f) the settlement or compromise of any obligation guaranteed
         hereby or hereby incurred; or

                  (g) any other circumstance whatsoever that might otherwise
         constitute a legal or equitable discharge or defense of a guarantor, it
         being the intent of this Section 5.3 that the obligations of the
         Guarantor with respect to the Guarantee Payments shall be absolute and
         unconditional under any and all circumstances.

                  There shall be no obligation of the Guarantee Trustee or the
Holders to give notice to, or obtain consent of, the Guarantor with respect to
the happening of any of the foregoing.

        SECTION 5.4 Enforcement of Guarantee.

                  The Guarantor and the Guarantee Trustee expressly acknowledge
and agree that (i) this Guarantee Agreement will be deposited with the Guarantee
Trustee to be held for the benefit of the Holders; (ii) the Guarantee Trustee
has the right to enforce this Guarantee Agreement on behalf of the Holders;
(iii) subject to the provisions of Section 3.2, Holders representing not less
than a Majority in liquidation amount of the Preferred Securities have the right
to direct the time, method and place of conducting any proceeding for any remedy
available to the Guarantee Trustee in respect of this Guarantee Agreement or
exercising any trust or other power conferred upon the Guarantee Trustee under
this Guarantee Agreement; and (iv) if the Guarantee Trustee fails to enforce
this Guarantee Agreement as provided in clauses (ii) and (iii)

                                       13
<PAGE>

above, any Holder may institute a legal proceeding directly against the
Guarantor to enforce its rights under this Guarantee Agreement, without first
instituting a legal proceeding against the Issuer, the Guarantee Trustee or any
other Person. Notwithstanding the foregoing, if the Guarantor has failed to make
a Guarantee Payment, a Holder may directly institute a proceeding against the
Guarantor for enforcement of this Guarantee Agreement for such payment without
first instituting a legal proceeding against the Issuer, the Guarantee Trustee
or any other Person.

        SECTION 5.5 Guarantee of Payment.

                  This Guarantee Agreement creates a guarantee of payment and
not merely of collection. This Guarantee Agreement will not be discharged except
by payment of the Guarantee Payments in full (without duplication of amounts
theretofore paid by the Issuer) or upon the distribution of the Debentures to
the Holders as provided in the Declaration.

        SECTION 5.6 Subrogation.

                  The Guarantor shall be subrogated to all (if any) rights of
the Holders against the Issuer in respect of any amounts paid to the Holders by
the Guarantor under this Guarantee Agreement; provided, however, that the
Guarantor shall not (except to the extent required by mandatory provisions of
law) be entitled to enforce or exercise any rights which it may acquire by way
of subrogation or any indemnity, reimbursement or other agreement, in all cases
as a result of payment under this Guarantee Agreement, if, at the time of any
such payment, any amounts are due and unpaid under this Guarantee Agreement. If
any amount shall be paid to the Guarantor in violation of the preceding
sentence, the Guarantor agrees to hold such amount in trust for the Holders and
to pay over such amount to the Holders or to the Guarantee Trustee for
remittance to the Holders.

        SECTION 5.7 Independent Obligations.

                  The Guarantor acknowledges that its obligations hereunder are
independent of the obligations of the Issuer with respect to the Preferred
Securities and that the Guarantor shall be liable as principal and as debtor
hereunder to make Guarantee Payments pursuant to the terms of this Guarantee
Agreement notwithstanding the occurrence of any event referred to in subsections
(a) through (g), inclusive, of Section 5.3 hereof.

                                   ARTICLE VI
                    LIMITATION OF TRANSACTIONS; SUBORDINATION

        SECTION 6.1 Limitation of Transactions.

                  So long as any Preferred Securities remain outstanding, the
Guarantor shall not (a) make any payment of principal of or any premium or
interest on, or repay, repurchase or redeem, any debt security of the Guarantor
that ranks pari passu with or junior to the Debentures in the right of payment;
(b) make any guarantee payments with respect to any guarantee by the Guarantor
of any debt securities of any of its subsidiaries if such guarantee ranks pari
passu with or junior to the Debentures in the right of payment; or (c) declare
or pay any dividends on, or redeem, purchase, acquire or make a distribution or
liquidation payment with respect to, any of the Guarantor's capital stock,
except for or as a result of (i) dividends or distributions in, or

                                       14
<PAGE>

options, warrants or rights to subscribe for or purchase, the Guarantor's
capital stock; (ii) any declaration of a dividend in connection with the
implementation of a stockholder's rights plan, or the issuance of the
Guarantor's capital stock under any such plan, or the redemption or repurchase
of any such rights pursuant thereto; (iii) a reclassification of the Guarantor's
capital stock or the exchange or conversion of one class or series of the
Guarantor's capital stock for or into another class or series of the Guarantor's
capital stock; (iv) the purchase of fractional interests in shares of the
Guarantor's capital stock pursuant to the conversion or exchange provisions of
such capital stock or the security being converted or exchanged; and (v) the
purchase or acquisition of the Guarantor's capital stock related to the issuance
of such capital stock or rights under any of the Guarantor's stock-based
compensation or benefit plans for its directors, officers or employees, any of
the Guarantor's dividend reinvestment plans or stock purchase plans, or any of
the stock-based compensation or benefit plans of any of the Guarantor's
Affiliates for such Affiliate's directors, officers or employees, if at such
time (1) the Guarantor shall be in default with respect to its Guarantee
Payments or other payment obligations hereunder, (2) there shall have occurred
and be continuing any event of default under the Declaration or (3) the
Guarantor shall have given notice of its election of an Extension Period and
such period, or any extension thereof, is continuing. In addition, so long as
any Preferred Securities remain outstanding, the Guarantor (a) will remain the
sole direct or indirect owner of all of the outstanding Common Securities and
shall not cause or permit the Common Securities to be transferred except to the
extent such transfer is permitted under the Declaration; provided that any
permitted successor of the Guarantor under the Indenture may succeed to the
Guarantor's direct or indirect ownership of the Common Securities, (b) will
cause the holder of the Common Securities to satisfy the requirements of Section
4.03 of the Declaration and (c) will use reasonable efforts to cause the Issuer
to continue to be treated as a grantor trust for U.S. federal income tax
purposes, except in connection with a distribution of Debentures as provided in
the Declaration.

        SECTION 6.2 Subordination.

                  This Guarantee Agreement will constitute an unsecured
obligation of the Guarantor and will rank (i) subordinate and junior in right of
payment to [all] [other] [senior] liabilities of the Guarantor, [except those
made pari passu or subordinate by their terms,] and (ii) senior to [all capital
stock now or hereafter issued by the Guarantor] [and to any guarantee now or
hereafter entered into by the Guarantor in respect of any of its capital stock].

                  If a Declaration Event of Default has occurred and is
continuing under the Declaration, the rights of the holders of the Common
Securities to receive Guarantee Payments will be subordinated to the rights of
the Holders to receive Guarantee Payments.

                                  ARTICLE VII
                                   TERMINATION

        SECTION 7.1 Termination.

                  This Guarantee Agreement shall terminate and be of no further
force and effect (i) upon full payment of the Redemption Price of all Preferred
Securities, (ii) upon the distribution of Debentures [, or any securities into
which such Debentures are convertible,] to Holders and

                                       15
<PAGE>

holders of Common Securities in exchange for all of the Preferred Securities and
Common Securities or (iii) upon full payment of the amounts payable in
accordance with the Declaration upon liquidation of the Issuer. Notwithstanding
the foregoing, this Guarantee Agreement will continue to be effective or will be
reinstated, as the case may be, if at any time any Holder must restore payment
of any sums paid with respect to the Preferred Securities or under this
Guarantee Agreement.

                                  ARTICLE VIII
                    LIMITATION OF LIABILITY; INDEMNIFICATION

        SECTION 8.1 Exculpation.

                  (a) No Indemnified Person shall be liable, responsible or
accountable in damages or otherwise to the Guarantor or any Holder for any loss,
damage or claim incurred by reason of any act or omission performed or omitted
by such Indemnified Person in good faith in accordance with this Guarantee
Agreement and in a manner such Indemnified Person reasonably believed to be
within the scope of the authority conferred on such Indemnified Person by this
Guarantee Agreement or by law, except that an Indemnified Person shall be liable
for any such loss, damage or claim incurred by reason of such Indemnified
Person's negligence or willful misconduct with respect to such acts or
omissions.

                  (b) An Indemnified Person shall be fully protected in relying
in good faith upon the records of the Guarantor and upon such information,
opinions, reports or statements presented to the Guarantor by any Person as to
matters the Indemnified Person reasonably believes are within such other
Person's professional or expert competence and who has been selected with
reasonable care by or on behalf of the Guarantor, including information,
opinions, reports or statements as to the value or amount of the assets,
liabilities, profits, losses or any other facts pertinent to the existence and
amount of assets from which Distributions to Holders might properly be paid.

        SECTION 8.2 Indemnification.

                  To the fullest extent permitted by applicable law, the
Guarantor shall indemnify and hold harmless each Indemnified Person from and
against any loss, liability, expense, damage or claim incurred by such
Indemnified Person arising out of or in connection with the acceptance or
administration of the trust or trusts hereunder or by reason of any act or
omission performed or omitted by such Indemnified Person in good faith in
accordance with this Guarantee Agreement and in a manner such Indemnified Person
reasonably believed to be within the scope of authority conferred on such
Indemnified Person by this Guarantee Agreement, except that no Indemnified
Person shall be entitled to be indemnified in respect of any loss, liability,
expense, damage or claim incurred by such Indemnified Person by reason of
negligence or willful misconduct with respect to such acts or omissions.

        SECTION 8.3 Survive Termination.

                  The provisions of Sections 8.1 and 8.2 shall survive the
termination of this Guarantee Agreement or the resignation or removal of the
Guarantee Trustee.

                                       16
<PAGE>

                                   ARTICLE IX
                                  MISCELLANEOUS

        SECTION 9.1 Successors and Assigns.

                  All guarantees and agreements contained in this Guarantee
Agreement shall bind the successors, assignees, receivers, trustees and
representatives of the Guarantor and shall inure to the benefit of the Guarantee
Trustee and the Holders then outstanding. The Guarantor shall not assign its
obligations hereunder except in connection with a consolidation or merger
involving, or a sale, lease, transfer or other disposition of all or
substantially all of the assets of, the Guarantor that is permitted under
Section 5.01 of the Indenture.

        SECTION 9.2 Amendments.

                  Except with respect to any changes which do not adversely
affect the rights of Holders in any material respect (in which case no consent
of Holders will be required), this Guarantee Agreement may only be amended with
the prior approval of the Guarantor, the Guarantee Trustee and the Holders of a
Majority in liquidation amount of the Preferred Securities. The provisions of
Section 12.02 of the Declaration concerning meetings of Holders shall apply to
the giving of such approval.

        SECTION 9.3 Notices.

                  Any notice, request or other communication required or
permitted to be given hereunder shall be in writing, duly signed by the party
giving such notice, request or communication, and delivered, telecopied or
mailed by first class mail as follows:

                  (a) if given to the Guarantor, to the address set forth below
         or such other address as the Guarantor may give notice of to the
         Guarantee Trustee:

                  Lennox International Inc.
                  2140 Lake Park Boulevard
                  Richardson, Texas  75080
                  Attention:  General Counsel
                  Telephone:    (972) 497-5000
                  Facsimile:    (972) 497-6660

                  (b) if given to the Guarantee Trustee, to the address set
         forth below or such other address as the Guarantee Trustee may give
         notice of to the Guarantor:

                  The Bank of New York
                  101 Barclay Street, Floor 8W
                  New York, New York 10286
                  Attention: Corporate Trust Administration
                  Telephone:    (212) 815-5498
                  Facsimile:    (212) 815-5707

                                       17
<PAGE>

                  (c) if given to any Holder, at the address set forth on the
         books and records of the Issuer.

                  All notices shall be deemed to have been given when (i)
received in person, (ii) telecopied with receipt confirmed or (iii) received if
mailed by first class mail, postage prepaid, except that if a notice or other
document is refused delivery or cannot be delivered because of a changed address
of which no notice was given, such notice or other document shall be deemed to
have been delivered on the date of such refusal or inability to deliver.

        SECTION 9.4 Genders.

                  The masculine, feminine and neuter genders used herein shall
include the masculine, feminine and neuter genders.

        SECTION 9.5 Benefit.

                  This Guarantee Agreement is solely for the benefit of the
Guarantee Trustee and the Holders and, subject to Section 3.1(a), is not
separately transferable from the Preferred Securities.

        SECTION 9.6 Governing Law.

                  THIS GUARANTEE AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (WITHOUT
REGARD TO ANY PRINCIPLES OF CONFLICTS OF LAWS THEREOF THAT WOULD RESULT IN THE
APPLICATION OF THE LAWS OF ANY OTHER JURISDICTION).

        SECTION 9.7 Counterparts.

                  This Guarantee Agreement may be executed in multiple
counterparts, each of which shall be an original; but all such counterparts
shall together constitute one and the same instrument.

        SECTION 9.8 [Exercise of Over-allotment Option.

                  If and to the extent that Preferred Securities are issued by
the Issuer upon exercise of the over-allotment option referred to in the first
recital to this Guarantee Agreement, the Guarantor agrees to give prompt notice
thereof to the Guarantee Trustee, but the failure to give such notice shall not
relieve the Guarantor of any of its obligations hereunder.]

                                       18
<PAGE>

                  THIS GUARANTEE AGREEMENT is executed as of the day and year
first above written.

                                   LENNOX INTERNATIONAL INC.

                                   By:
                                         ---------------------------------------
                                         Name:
                                         Title:

                                   THE BANK OF NEW YORK,
                                   as Guarantee Trustee

                                   By:
                                         ---------------------------------------
                                         Name:
                                         Title:

                                       19

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