Document:

<PAGE>
                                                                   EXHIBIT 4.1

   NUMBER                                                             SHARES

AB                               [PICTURE]

COMMON STOCK                                                       COMMON STOCK

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                              ACUITY BRANDS, INC.

THIS CERTIFICATE IS TRANSFERABLE IN
NEW YORK, NEW YORK OR MINNEAPOLIS, MINNESOTA                  CUSIP 00508Y 10 2

This Certifies that
                                                                SEE REVERSE FOR
                                                            CERTAIN DEFINITIONS

is the owner of

 FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF ONE CENT ($.01) EACH,
                            OF THE COMMON STOCK OF

COUNTERSIGNED AND REGISTERED
         WELLS FARGO BANK MINNESOTA, N.A.
                                                                 TRANSFER AGENT
                                                                  AND REGISTRAR
BY

                                                           AUTHORIZED SIGNATURE

Acuity Brands, Inc. (herein called "the Corporation") transferable on the books
of the Corporation in person or by duly authorized attorney upon surrender of
this Certificate properly endorsed. This Certificate and the shares represented
hereby are issued and shall be held subject to all the process of the
Certificate of Incorporation as amended of the Corporation, a copy of which
Certificate of Incorporation is on file with the Transfer Agent, all of which
the holder by the acceptance hereof expressly assents and is bound. This
Certificate is not valid until countersigned by the Transfer Agent and
registered by the Registrar. Witness the seal of the Corporation and the
signatures of its duly authorized officers.

Dated

                                     [SEAL]

/s/ Helen D. Haines                    /s/   James S. Balloun
    --------------------------             --------------------------
            SECRETARY                        CHAIRMAN OF THE BOARD

                          AMERICAN BANK NOTE COMPANY
<PAGE>

Until the Separation Time (as defined in the Rights Agreement referred to
below), this certificate also evidences and entitles the holder hereof to
certain Rights as set forth in a Stockholder Protection Rights Agreement, dated
as of November __, 2001 (as such may be amended from time to time, the "Rights
Agreement"), between Acuity Brands, Inc. (the "Company") and Wells Fargo Bank
Minnesota, N.A. as Rights Agent, the terms of which are hereby incorporated
herein by reference and a copy of which is on file at the principal executive
offices of the Company. Under certain circumstances, as set forth in the Rights
Agreement, such Rights may be redeemed, may become exercisable for securities or
assets of the Company or securities of another entity, may be exchanged for
shares of Common Stock or other securities or assets of the Company, may expire,
may become null and void (if they are "Beneficially Owned" by an "Acquiring
Person" or an "Affiliate" or "Associate" thereof, as such terms are defined in
the Rights Agreement, or by any transferee of any of the foregoing) or may be
evidenced by separate certificates and may no longer be evidenced by this
certificate. The Company will mail or arrange for the mailing of a copy of the
Rights Agreement to the holder of this certificate without charge after the
receipt of a written request therefor.

                              ACUITY BRANDS, INC.

A FULL STATEMENT OF THE DESIGNATIONS, PREFERENCES, LIMITATIONS, VOTING RIGHTS
AND RELATIVE RIGHTS OF THE SHARES OF EACH CLASS OF STOCK MAY BE OBTAINED BY ANY
STOCKHOLDER, WITHOUT CHARGE, FROM THE TRANSFER AGENT, OR THE OFFICE OF THE
SECRETARY OF THE CORPORATION.

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<Table>
  <S>                                                 <C>
  TEN CON -- as tenants in common                     UNIF GIFT MIN ACT -- __________ Custodian __________
  TEN ENT -- as tenant by the entireties                                     (Cust)              (Minor)
  JT TEN  -- as joint tenants with right of                                under Uniform Gifts to Minors
             survivorship and not as tenants
             in common                                                     ACT ___________________________
                                                                                        (State)
</Table>

    Additional abbreviations may also be used though not in the above list.

For value received _______________________ hereby sell, assign and transfer into

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE
---------------------------------------

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

--------------------------------------------------------------------------------
             PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE

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

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

____________________________________________________ Shares of the capital stock

represented by the within Certificate, and do hereby irrevocably constitute and
appoint

_____________________________________________________________ Attorney, to

transfer the said stock on the books of the within-named Corporation with full
power of substitution in the premises.

Dated

--------------------------------------------------------------------------------
NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

--------------------------------------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALION PROGRAM
PURSUANT TO RULE 17Ad-15 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED
--------------------------------------------------------------------------------
 SIGNATURE(S) GUARANTEED BY:

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

<Table>
<S>                                                   <C>
-------------------------------------------------     -------------------------------------------------
           AMERICAN BANK NOTE COMPANY                 PRODUCTION COORDINATOR: LISA MARTIN: 215-764-??26
          55TH STREET AT SANSOM STREET                            PROOF OF OCTOBER 25, 2001
             PHILADELPHIA, PA 15139                                  ACUITY BRANDS, INC.
                 (212) 784-5600                                         H 71319 back
-------------------------------------------------     -------------------------------------------------
         SALES ANDY HOBBS: 404-525-1455                         OPERATOR:                  eg
-------------------------------------------------     -------------------------------------------------
    /NET/BANKNOTE/HOME 23/MAC 6/ACUITYm71319                                 NEW
-------------------------------------------------     -------------------------------------------------
</Table><PAGE>
                                                                    EXHIBIT 10.2

                          TRANSITION SERVICES AGREEMENT

         THIS TRANSITION SERVICES AGREEMENT, dated as of _________, 2001 (this
"Agreement"), is made by and between National Service Industries, Inc., a
Delaware corporation ("Parent"), and Acuity Brands, Inc., a Delaware corporation
("Spinco").

                                  WITNESSETH:

         WHEREAS, Parent and Spinco are parties to an Agreement and Plan of
Distribution, dated as of __________, 2001 (the "Distribution Agreement"),
pursuant to which Parent will transfer certain assets to Spinco and have Spinco
assume certain liabilities of Parent;

         WHEREAS, in connection with the transactions contemplated by the
Distribution Agreement, Parent and Spinco wish to enter into this Agreement for
purposes of continuity and transition; and

         WHEREAS, Spinco desires to cause Parent to provide the Services set
forth on Schedule A to Spinco, and Parent is willing to provide such Services,
and Parent desires to cause Spinco to provide the Services set forth on Schedule
B to Parent, and Spinco is willing to provide such Services, all on the terms
and conditions set forth below;

         NOW, THEREFORE, the parties hereto, in consideration of the premises
and the mutual covenants contained herein, agree as follows:

SECTION 1.        SPECIFIC DEFINITIONS.

         In addition to the terms defined elsewhere in this Agreement, as used
in this Agreement, the following terms have the respective meanings set forth
below:

         "Applicable Rate" shall mean the rate of interest per annum announced
from time to time by as its prime lending rate __________________________ plus
4% per annum.

         "Loss" shall mean all losses, liabilities, damages, claims, demands,
judgments or settlements of any nature or kind, known or unknown, fixed,
accrued, absolute or contingent, liquidated or unliquidated, including all
reasonable costs and expenses (legal, accounting or otherwise as such costs are
incurred) relating thereto.

         "Parent Services" shall mean those transitional services to be provided
by Parent to Spinco set forth on Schedule A hereto to assist Spinco in operating
Spinco's business.

         "Person" shall mean any natural person, corporation, business trust,
limited liability company, joint venture, association, company, partnership or
government, or any agency or political subdivision thereof.

         "Services" shall mean, collectively, the Parent Services and the Spinco
Services.

         "Spinco Services" shall mean those transitional services to be provided
by Spinco to Parent set forth on Schedule B hereto to assist Parent in operating
Parent's business.

SECTION 2.        SERVICES.

         2.1      Services. (a) Parent shall provide to Spinco each Parent
Service for the term set forth opposite the description of such Parent Service
in Schedule A. Additional services may be provided to Spinco by Parent if such
arrangement is agreed to in writing and executed by Parent and Spinco.

<PAGE>

                  (b)      Spinco shall provide to Parent each Spinco Service
for the term set forth opposite the description of such Spinco Service in
Schedule B. Additional services may be provided by Spinco to Parent if such
arrangement is agreed in writing and executed by Parent and Spinco.

         2.2      Standard of Service. In performing the Services, Parent and
Spinco shall provide substantially the same level of service and use
substantially the same degree of care as their respective personnel provided and
used in providing such Services prior to the date hereof, subject in each case
to any provisions set forth on Schedule A or Schedule B with respect to each
such Service.

SECTION 3.        LICENSES AND PERMITS.

         Each party warrants and covenants that all duties and obligations
(including with respect to Parent, all Parent Services and with respect to
Spinco, all Spinco Services) to be performed hereunder shall be performed in
compliance with all material applicable federal, state, provincial and local
laws, rules and regulations. Each party shall obtain and maintain all material
permits, approvals and licenses necessary or appropriate to perform its duties
and obligations (including with respect to Parent, the Parent Services and with
respect to Spinco, the Spinco Services) hereunder and shall at all times comply
with the terms and conditions of such permits, approvals and licenses.

SECTION 4.        PAYMENT.

         4.1      Service Fees. (a) In consideration for the provision of each
of the Parent Services, Spinco shall pay to Parent the fee set forth for such
Parent Service on Schedule A.

                  (b)      In consideration for the provision of each of the
Spinco Services, Parent shall pay to Spinco the fee set forth for such Spinco
Service on Schedule B.

         4.2      Costs and Expenses. (a) In addition to the fees payable in
accordance with Section 4.1(a), Spinco shall reimburse Parent for all reasonable
and necessary out-of-pocket costs and expenses (including postage and other
delivery costs, telephone, telecopy and similar expenses) incurred by Parent
with respect to third parties in connection with the provision of Parent
Services to Spinco pursuant to the terms of this Agreement or paid by Parent on
behalf of Spinco.

                  (b)      In addition to the fees payable in accordance with
Section 4.1(b), Parent shall reimburse Spinco for all reasonable and necessary
out-of-pocket costs and expenses (including amounts for premiums, claims, fees,
postage and other delivery costs, telephone, telecopy and similar expenses)
incurred by Spinco with respect to third parties in connection with the
provision of Spinco Services to Parent pursuant to the terms of this Agreement
or paid by Spinco on behalf of Parent.

         4.3      Invoices. (a) Parent will invoice Spinco in U.S. dollars: (i)
as of the last day of each calendar month for any fees payable by Spinco in
accordance with Section 4.1(a) for Parent Services listed on Schedule A provided
pursuant to the terms of this Agreement during such month; (ii) as of the last
day of each calendar month for any amounts payable by Spinco in accordance with
Section 4.2(a) for any out-of-pocket costs and expenses incurred during the
immediately preceding month to the extent Parent has received an invoice from
such third party; and (iii) as of the last day of each calendar month for any
taxes (excluding income taxes) payable with respect to the provision of Parent
Services to Spinco during such month. Parent shall deliver or cause to be
delivered to Spinco each such invoice within thirty (30) days following the last
day of the calendar month to which such invoice relates. Spinco shall pay each
such invoice received by electronic funds transfer within thirty (30) days of
the date on which such invoice was received.

                  (b)      Spinco will invoice Parent in U.S. dollars: (i) as of
the last day of each calendar month for any fees payable by Parent in accordance
with Section 4.1(b) for Spinco Services listed on Schedule B provided pursuant
to the terms of this Agreement during such month; (ii) as of the last day of
each calendar month for any

                                      -2-
<PAGE>

amounts payable by Parent in accordance with Section 4.2(b) for any
out-of-pocket costs and expenses incurred during the immediately preceding month
to the extent Spinco has received an invoice from such third party; and (iii) as
of the last day of each calendar month for any taxes (excluding income taxes)
payable with respect to the provision of Spinco Services to Parent during such
month. Spinco shall deliver or cause to be delivered to Parent each such invoice
within thirty (30) days following the last day of the calendar month to which
such invoice relates. Parent shall pay each such invoice received by electronic
funds transfer within thirty (30) days of the date on which such invoice was
received.

         4.4      Late Payment. Any amount not paid when due shall be subject to
a late payment fee computed daily at a rate equal to the Applicable Rate.
Notwithstanding the foregoing, in the event a party disputes the accuracy of any
invoice, a party shall pay the undisputed portion of such invoice as provided
herein, and the parties hereto will promptly meet and seek to resolve the
disputed amount of the invoice. Each party agrees to pay the other party's
reasonable attorneys' fees and other costs incurred in collection of any amounts
owed to such other party hereunder and not paid when due. Notwithstanding
anything to the contrary contained herein, in the event either party fails to
make a payment when due hereunder, and such failure continues for a period of
thirty (30) days following delivery of written notice to such non-paying party
of such failure, the other party shall have the right to cease provision of
Services to such non-paying party until such overdue payment (and any applicable
late payment fee accrued with respect thereto) is paid in full. Such right of
the party providing Services shall not in any manner limit or prejudice any of
such party's other rights or remedies in the event of the non-paying party's
failure to make payments when due hereunder, including any rights or remedies
pursuant to Section 7.

         4.5      Fees, Etc. Upon Termination of Services. In the event of a
termination of Services pursuant to Section 7.1, with respect to the calendar
month in which such Services cease to be provided (the "Termination Month"), the
recipient of such Services shall be obligated to pay a pro rata share of the fee
for such Service set forth on Schedule A or Schedule B, as applicable, equal to
the product of (x) the fee set forth on Schedule A or Schedule B, as applicable,
multiplied by (y) a fraction, the numerator of which is the number of days in
the Termination Month such Services are provided, and the denominator of which
is 30.

         SECTION 5.        INDEMNIFICATION.

         5.1      Indemnification by Principal. (a) Spinco agrees to indemnify,
defend and hold Parent harmless from and against any Loss to which Parent may
become subject arising out of, by reason of or otherwise in connection with the
provision hereunder by Parent of Parent Services, other than Losses resulting
from Parent's gross negligence, willful misconduct or material breach of its
obligations pursuant to this Agreement. Notwithstanding any provision in this
Agreement to the contrary, Spinco shall not be liable under this Section 5.1 for
any consequential, special or punitive damages (including lost profits), except
to the extent that such consequential, special or punitive damages relate to a
Loss resulting from a Third-Party Claim (as defined in the Distribution
Agreement).

                  (b)      Parent agrees to indemnify, defend and hold Spinco
harmless from and against any Loss to which Spinco may become subject arising
out of, by reason of or otherwise in connection with the provision hereunder by
Spinco of Spinco Services, other than Losses resulting from Spinco's gross
negligence, willful misconduct or material breach of its obligations pursuant to
this Agreement. Notwithstanding any provision in this Agreement to the contrary,
Parent shall not be liable under this Section 5.1 for any consequential, special
or punitive damages (including lost profits), except to the extent that such
consequential, special or punitive damages relate to a Loss resulting from a
Third-Party Claim (as defined in the Distribution Agreement).

         5.2      Indemnification by Provider. (a) Parent agrees to indemnify,
defend and hold Spinco harmless from and against any Loss to which Spinco may
become subject arising out of, by reason of or otherwise in connection with the
provision hereunder by Parent of Parent Services to Spinco where such Losses
resulted from Parent's gross negligence, willful misconduct or material breach
of its obligations pursuant to this Agreement.

                  (b)      Spinco agrees to indemnify, defend and hold Parent
harmless from and against any Loss to which Parent may become subject arising
out of, by reason of or otherwise in connection with the provision

                                      -3-
<PAGE>

hereunder by Spinco of Spinco Services to Parent where such Losses resulted from
Spinco's gross negligence, willful misconduct or material breach of its
obligations pursuant to this Agreement.

         5.3      Procedures for Indemnification. Any indemnification claims
made hereunder shall be made in accordance with Article III of the Distribution
Agreement.

         SECTION 6.        CONFIDENTIALITY.

         Each party shall keep confidential the Schedules to this Agreement and
all information received from the other party regarding the Services, including
any information received with respect to Parent or Spinco, and to use such
information only for the purposes set forth in this Agreement unless otherwise
agreed to in writing by the party from which such information was received. In
the event a party is required by any court or legislative or administrative body
(by oral questions, interrogatories, requests for information or documents,
subpoena, civil investigation demand or similar process) to disclose any
confidential information provided pursuant to this Agreement, the party shall
provide the other party with prompt notice of such requirement in order to
afford the other party an opportunity to seek an appropriate protective order or
other remedy. However, if the other party is unable to obtain or does not seek
such protective order and the party required to disclose the confidential
information is, in the opinion of its counsel, legally compelled to disclose
such confidential information, disclosure of such information may be made
without liability under this Agreement. The covenants in this Section 6 shall
survive any termination of this Agreement indefinitely with respect to
information qualifying as a trade secret under applicable law and for a period
of three (3) years from the date such termination becomes effective with respect
to all other information.

         SECTION 7.        TERM.

         7.1      Duration. (a) Subject to Sections 6, 7.2, 7.3 and 7.4, the
term of this Agreement shall commence on the date hereof and shall continue in
full force and effect with respect to each Service until the earlier of (i) the
expiration of the duration or term period assigned to such Service on Schedule A
or Schedule B or (ii) the termination of such Service in accordance with Section
7.1(b).

                  (b)      Each party acknowledges that the purpose of this
Agreement is for Parent to provide the Parent Services to Spinco on an interim
basis until Spinco can perform the Parent Services for itself, and for Spinco to
provide the Spinco Services to Parent on an interim basis until Parent can
perform the Spinco Services for itself. Accordingly, each of Parent and Spinco
shall use its commercially reasonable efforts to make or obtain such approvals,
permits and licenses and implement such systems, as shall be necessary for it to
provide the appropriate Services for itself as promptly as practicable. As
Spinco becomes self-sufficient or engages other sources to provide any Parent
Service, Spinco shall be entitled to release Parent from providing any or all of
the Parent Services hereunder by delivering a written notice thereof to Parent
at least thirty (30) days prior to the effective date of release of such Parent
Service(s). At the end of such thirty (30) day period (or such shorter period as
may be agreed by the parties), Parent shall discontinue the provision of the
Parent Services specified in such notice and any such Parent Services shall be
excluded from this Agreement, and Schedule A shall be deemed to be amended
accordingly. As Parent becomes self-sufficient or engages other sources to
provide any Spinco Service, Parent shall be entitled to release Spinco from
providing any or all of the Spinco Services hereunder by delivering a written
notice thereof to Spinco at least thirty (30) days (or in the case of Services
provided under the heading "Employee Benefits" on Schedule B, at least ninety
(90) days). At the end of such thirty (30) or ninety (90) day period (or such
shorter period as may be agreed by the parties), Spinco shall discontinue the
provision of the Spinco Services specified in such notice and any such Spinco
Services shall be excluded from this Agreement, and Schedule B shall be deemed
to be amended accordingly.

         7.2      Early Termination by Parent. Parent may terminate this
Agreement by giving written notice to Spinco if Spinco shall default in the
performance of any of its material obligations under, or breach any of its
warranties set forth in, this Agreement, and such default or breach shall
continue and not be remedied for a period of thirty (30) days after Parent has
given written notice to Spinco specifying such default or breach and requiring
it to be remedied.

                                      -4-
<PAGE>

         7.3      Early Termination by Spinco. Spinco may terminate this
Agreement by giving written notice to Parent if Parent shall default in the
performance of any of its material obligations under, or breach any of its
warranties set forth in, this Agreement and such default or breach shall
continue and not be remedied for a period of thirty (30) days after Spinco has
given written notice to Parent specifying such default or breach and requiring
it to be remedied.

         7.4      Force Majeure. In the event the performance by Spinco or
Parent of their respective duties or obligations hereunder is interrupted or
interfered with by reason of any cause beyond its reasonable control, including
fire, storm, flood, earthquake, explosion, war, strike or labor disruption,
rebellion, insurrection, quarantine, act of God, boycott, embargo, shortage or
unavailability of supplies, riot, or governmental law, regulation or edict
(collectively, the "Force Majeure Events"), the party affected by such Force
Majeure Event shall not be deemed to be in default of this Agreement by reason
of its nonperformance due to such Force Majeure Event, but shall give prompt
written notice to the other party of the Force Majeure Event. The party affected
by the Force Majeure Event shall cooperate with the other party in obtaining, at
the other party's sole expense, an alternative source for the affected Services,
and the other party shall be released from any payment obligation to the party
affected by the Force Majeure Event with respect to such Services during the
period of such Force Majeure Event. Additionally, upon and during the occurrence
of a Force Majeure Event, at the sole option of the party receiving the Services
affected by the Force Majeure Event, the term of this Agreement shall be tolled
with respect to any Services that are not being provided by a third party.

         7.5      Consequences on Termination. In the event this Agreement
expires or is terminated in accordance with this Section 7, then (a) all
Services to be provided will promptly cease, (b) each of Parent and Spinco shall
promptly return all confidential information received from the other party in
connection with this Agreement (including the return of all information received
with respect to the Services of Parent or Spinco, as the case may be), without
retaining a copy thereof, and (c) each of Parent and Spinco shall honor all
credits and make any accrued and unpaid payment to the other party as required
pursuant to the terms of this Agreement, and no rights already accrued hereunder
shall be affected.

         SECTION 8.        RECORDS.

         Each of the parties shall create and, for a period of six (6) years
after the termination or expiration of this Agreement, maintain full and
accurate books in connection with the provision of the Services, and all other
records relevant to this Agreement, and upon reasonable notice from the other
party shall make available for inspection and copy by such other party's agents
such records during reasonable business hours.

         SECTION 9.        DISPUTE RESOLUTION.

         9.1      Dispute Resolution under Distribution Agreement. Any dispute
arising out of or relating to the performance, breach or interpretation of this
Agreement shall be handled in accordance with Article V of the Distribution
Agreement.

         9.2      Continuity of Service and Performance. Unless otherwise agreed
herein or in writing, the parties will continue to provide Services and honor
all other commitments under this Agreement and each Ancillary Agreement (as
defined in the Distribution Agreement) during the course of dispute resolution
pursuant to the provisions of this Section 9 with respect to all matters not
subject to such dispute, controversy or claim.

         SECTION 10.       NOTICES.

         All notices and other communications hereunder shall be in writing,
shall reference this Agreement and shall be hand delivered or mailed by
registered or certified mail (return receipt requested) or sent by any means of
electronic message transmission with delivery confirmed (by voice or otherwise)
to the parties at the following

                                      -5-
<PAGE>

addresses (or at such other addresses for a party as shall be specified by like
notice) and will be deemed given on the date on which such notice is received:

         To Parent:

                  National Service Industries, Inc.
                  1420 Peachtree Street, N.E.
                  Atlanta, Georgia  30309-3002
                  Attention:  Carol E. Morgan
                  Telephone:
                              ------------------------------
                  Facsimile:
                              ------------------------------

         To Spinco:

                  Acuity Brands, Inc.
                  1420 Peachtree Street, N.E.
                  Atlanta, Georgia  30309-3002
                  Attention: Kenyon W. Murphy
                  Telephone: (404) 853-1440
                  Facsimile: (404) 853-1015

         SECTION 11.       MISCELLANEOUS.

         11.1     Waivers, Modifications, Amendments. Any provision of this
Agreement may be amended or waived if, and only if, such amendment or waiver is
in writing and signed, in the case of an amendment, by Spinco, on the one hand,
and Parent, on the other hand, or in the case of a waiver, by the party against
whom the waiver is to be effective. No failure or delay by any party in
exercising any right, power or privilege hereunder shall operate as a waiver
thereof nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or the exercise of any other right, power or privilege.
The rights and remedies herein provided shall be cumulative and in addition to
other or further remedies provided by law or equity.

         11.2     GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE APPLICABLE TO
CONTRACTS MADE AND TO BE PERFORMED IN THE STATE OF DELAWARE.

         11.3     Severability. The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof. If any
provision of this Agreement, or the application thereof to any person,
corporation, partnership or other entity or any circumstance, is invalid and
unenforceable, (a) a suitable and equitable provision shall be substituted
therefor in order to carry out, so far as may be valid and enforceable, the
intent and purpose of such invalid or unenforceable provision and (b) the
remainder of this Agreement and the application of such provision to other
persons, corporations, partnerships or other entities or circumstances shall not
be affected by such invalidity or unenforceability, nor shall such invalidity or
unenforceability affect the validity or enforceability of such provision, or the
application thereof, in any jurisdiction.

         11.4     Reference; Interpretation. References in this Agreement to any
gender include references to all genders, and references to the singular include
references to the plural and vice versa. The words "include", "includes" and
"including" when used in this Agreement shall be deemed to be followed by the
phrase "without limitation." Unless the context otherwise requires, references
in this Agreement to Sections and Schedules shall be deemed references to
Sections of, and Schedules to, this Agreement. Unless the context otherwise
requires, the words "hereof", "hereby" and "herein" and words of similar meaning
when used in this Agreement refer to this Agreement in its entirety and not to
any particular Section or provision of this Agreement. This Agreement shall not
be construed against either party as the principal drafter hereof.

                                      -6-
<PAGE>

         11.5     Entire Agreement. This Agreement (including all Schedules
hereto) contains the entire agreement between the parties hereto with respect to
the subject matter hereof and supersedes all prior agreements and
understandings, oral or written, with respect to such matters.

         11.6     Assignment. Neither Parent nor Spinco may, directly or
indirectly, assign or subcontract, or attempt to assign or subcontract, any of
its rights or obligations hereunder, in whole or in part, by operation of law or
otherwise, except as contemplated by Schedule A or Schedule B or except with the
prior written consent of the other party; it being understood that such consent
shall not be unreasonably withheld if Parent or Spinco assigns or subcontracts
the Agreement to one of its Affiliates (as defined in the Distribution
Agreement) with the financial and other resources and expertise to perform all
of the obligations of such party hereunder. Any attempted assignment or
delegation not in compliance with the forgoing shall be null and void and of no
effect. Nothing contained herein shall prevent a party from providing Services
through or with the assistance of third parties whom such party regularly used
to provide such Services prior to the date hereof.

         11.7     Binding Effect. This Agreement shall be binding upon the
parties hereto and their respective successors and permitted assigns, if any,
and except as provided herein, shall inure to the benefit of the parties hereto
and their respective successors and permitted assigns, if any.

         11.8     Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, and all of which shall
constitute one and the same Agreement.

         11.9     No Agency or Partnership. Nothing in this Agreement will
create, or will be deemed to create, a partnership or the relationship of
principal and agent or of employer and employee between the parties.

         11.10    Provisions Unaffected. Nothing contained in this Agreement
shall affect the rights and obligations of Parent and Spinco pursuant to the
Distribution Agreement.

                                      -7-
<PAGE>

         IN WITNESS WHEREOF, this Agreement has been duly executed and delivered
on behalf of the parties as of the date first herein above written.

                                     NATIONAL SERVICE INDUSTRIES, INC.

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

                                     ACUITY BRANDS, INC.

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

                                      -8-

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