<PAGE>

                                   EXHIBIT 4.5


THIS WARRANT AND THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
STATE, AND MAY NOT BE TRANSFERRED IN VIOLATION OF SUCH ACT, THE RULES AND
REGULATIONS THEREUNDER OR ANY STATE SECURITIES LAWS OR THE PROVISIONS OF THIS
WARRANT.

                     No. of Shares of Common Stock: 250,000

                                     WARRANT

                           To Purchase Common Stock of

                        AIRTECH INTERNATIONAL GROUP, INC.


                  THIS IS TO CERTIFY THAT PK Investors LLC, a Delaware limited
liability company, or its registered assigns, is entitled, at any time from the
Warrant Issuance Date (as hereinafter defined) to the Expiration Date (as
hereinafter defined), to purchase from Airtech International Group, Inc., a
Wyoming corporation (the "Company"), two hundred fifty thousand (250,000) shares
of Common Stock (as hereinafter defined and subject to adjustment as provided
herein), in whole or in part, including fractional parts, at a purchase price
per share equal to $2.585 (subject to any adjustments made to such amount
pursuant to Section 4 hereto) on the terms and conditions and pursuant to the
provisions hereinafter set forth.

1.   DEFINITIONS

                  As used in this Warrant, the following terms have the
respective meanings set forth below:

                  "Additional Shares of Common Stock" shall mean all shares of
Common Stock issued by the Company after the Initial Closing Date, other than
Warrant Stock.

                  "Book Value" shall mean, in respect of any share of Common
Stock on any date herein specified, the consolidated book value of the Company
as of the last day of any month immediately preceding such date, divided by the
number of Fully Diluted Outstanding shares of Common Stock as determined in
accordance with GAAP (assuming the payment of the exercise prices for such
shares) by a firm of independent certified public accountants of recognized
national standing selected by the Company and reasonably acceptable to the
Holder.

                  "Business Day" shall mean any day that is not a Saturday or
Sunday or a day on which banks are required or permitted to be closed in the
State of New York.


<PAGE>

                   "Commission" shall mean the Securities and Exchange
Commission or any other federal agency then administering the Securities Act and
other federal securities laws.

                  "Common Stock" shall mean (except where the context otherwise
indicates) the Common Stock, par value $.05 per share, of the Company as
constituted on the Initial Closing Date, and any capital stock into which such
Common Stock may thereafter be changed, and shall also include (i) capital stock
of the Company of any other class (regardless of how denominated) issued to the
holders of shares of Common Stock upon any reclassification thereof which is
also not preferred as to dividends or assets over any other class of stock of
the Company and which is not subject to redemption and (ii) shares of common
stock of any successor or acquiring corporation received by or distributed to
the holders of Common Stock of the Company in the circumstances contemplated by
Section 4.4.

                  "Convertible Securities" shall mean evidences of indebtedness,
shares of stock or other securities which are convertible into or exchangeable,
with or without payment of additional consideration in cash or property, for
shares of Common Stock, either immediately or upon the occurrence of a specified
date or a specified event.

                  "Current Warrant Price" shall mean, $2.585 subject to any
adjustments to such amount made in accordance with Section 4 hereof.

                  "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended, or any successor federal statute, and the rules and regulations of
the Commission thereunder, all as the same shall be in effect from time to time.

                  "Exercise Period" shall mean the period during which this
Warrant is exercisable pursuant to Section 2.1.

                  "Expiration Date" shall February 22, 2005.

                  "Fully Diluted Outstanding" shall mean, when used with
reference to Common Stock, at any date as of which the number of shares thereof
is to be determined, all shares of Common Stock Outstanding at such date and all
shares of Common Stock issuable in respect of this Warrant, outstanding on such
date, and other options or warrants to purchase, or securities convertible into,
including without limitation the shares of Common Stock outstanding on such date
which would be deemed outstanding in accordance with GAAP for purposes of
determining book value or net income per share.

                  "GAAP" shall mean generally accepted accounting principles in
the United States of America as from time to time in effect.
                  "Holder" shall mean the Person in whose name the Warrant or
Warrant Stock set forth herein is registered on the books of the Company
maintained for such purpose.

                  "Initial Closing Date" shall have the meaning set forth in the
Securities Purchase Agreement.


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                  "Market Price" per Common Share means the average of the
closing bid prices of the Common Shares as reported on the National Association
of Securities Dealers Automated Quotation System for the National Market,
("NASDAQ") or, if such security is not listed or admitted to trading on the
NASDAQ, on the principal national security exchange or quotation system on which
such security is quoted or listed or admitted to trading, or, if not quoted or
listed or admitted to trading on any national securities exchange or quotation
system, the closing bid price of such security on the over-the-counter market on
the day in question as reported by the National Association of Security Dealers,
Inc., or a similar generally accepted reporting service, as the case may be, for
the five (5) trading days immediately preceding the date of determination.

                  "Other Property" shall have the meaning set forth in Section
4.4.

                  "Outstanding" shall mean, when used with reference to Common
Stock, at any date as of which the number of shares thereof is to be determined,
all issued shares of Common Stock, except shares then owned or held by or for
the account of the Company or any subsidiary thereof, and shall include all
shares issuable in respect of outstanding scrip or any certificates representing
fractional interests in shares of Common Stock.

                  "Person" shall mean any individual, sole proprietorship,
partnership, joint venture, trust, incorporated organization, association,
corporation, institution, public benefit corporation, entity or government
(whether federal, state, county, city, municipal or otherwise, including,
without limitation, any instrumentality, division, agency, body or department
thereof).

                  "Registration Rights Agreement" shall mean the Registration
Rights Agreement dated a date even herewith by and between the Company and PK
Investors LLC, as it may be amended from time to time.

                  "Restricted Common Stock" shall mean shares of Common Stock
which are, or which upon their issuance on the exercise of this Warrant would
be, evidenced by a certificate bearing the restrictive legend set forth in
Section 9.1(a).

                  "Securities Act" shall mean the Securities Act of 1933, as
amended, or any successor federal statute, and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

                  "Securities Purchase Agreement" shall mean the Securities
Purchase Agreement dated as of a date even herewith by and between the Company
and PK Investors LLC, as it may be amended from time to time.
                  "Transfer" shall mean any disposition of any Warrant or
Warrant Stock or of any interest in either thereof, which would constitute a
sale thereof within the meaning of the Securities Act.

                  "Transfer Notice" shall have the meaning set forth in Section
9.2.

                  "Warrant Issuance Date" shall mean any date on which Warrants
are issued pursuant


<PAGE>

to the Securities Purchase Agreement.

                  "Warrants" shall mean this Warrant and all warrants issued
upon transfer, division or combination of, or in substitution for, any thereof.
All Warrants shall at all times be identical as to terms and conditions and
date, except as to the number of shares of Common Stock for which they may be
exercised.

                  "Warrant Price" shall mean an amount equal to (i) the number
of shares of Common Stock being purchased upon exercise of this Warrant pursuant
to Section 2.1, multiplied by (ii) the Current Warrant Price as of the date of
such exercise.

                  "Warrant Stock" shall mean the shares of Common Stock
purchased by the holders of the Warrants upon the exercise thereof.

2.   EXERCISE OF WARRANT

                  2.1. MANNER OF EXERCISE. From and after the Warrant Issuance
Date and until 5:00 P.M., New York City time, on the Expiration Date, Holder may
exercise this Warrant, on any Business Day, for all or any part of the number of
shares of Common Stock purchasable hereunder.

                  In order to exercise this Warrant, in whole or in part, Holder
shall deliver to the Company at the office or agency designated by the Company
pursuant to Section 12, (i) a written notice of Holder's election to exercise
this Warrant, which notice shall specify the number of shares of Common Stock to
be purchased, (ii) payment by cash, check or bank draft payable to the Company
of the Warrant Price in cash or by wire transfer or cashier's check drawn on a
United States bank or by the Holder's surrender of Warrant Stock (or the right
to receive such number of shares) having an aggregate Market Price equal to the
Warrant Price for all shares then being purchased and (iii) this Warrant. Such
notice shall be substantially in the form of the subscription form appearing at
the end of this Warrant as EXHIBIT A, duly executed by Holder or its agent or
attorney. Upon receipt of the items referred to in clauses (i), (ii) and (iii)
above, the Company shall, as promptly as practicable, and in any event within
five (5) Business Days thereafter, execute or cause to be executed and deliver
or cause to be delivered to Holder a certificate or certificates representing
the aggregate number of full shares of Common Stock issuable upon such exercise,
together with cash in lieu of any fraction of a share, as hereinafter provided.
The stock certificate or certificates so delivered shall be, to the extent
possible, in such denomination or denominations as Holder shall request in the
notice and shall be registered in the name of Holder or, subject to Section 9,
such other name as shall be designated in the notice. This Warrant shall be
deemed to have been exercised and such certificate or certificates shall be
deemed to have been issued, and Holder or any other Person so designated to be
named therein shall be deemed to have become a holder of record of such shares
for all purposes, as of the date the Warrant has been exercised by payment to
the Company of the Warrant Price. If this Warrant shall have been exercised in
part, the Company shall, at the time of delivery of the certificate or
certificates representing Warrant Stock, deliver to Holder a new Warrant
evidencing the rights of Holder to purchase the unpurchased shares of Common
Stock called for by this Warrant, which new Warrant shall in all other respects
be identical with this Warrant.


<PAGE>

                  The Holder shall be entitled to exercise the Warrant
notwithstanding the commencement of any case under 11 U.S.C. Section 101 ET SEQ.
(the "Bankruptcy Code"). In the event the Company is a debtor under the
Bankruptcy Code, the Company hereby waives to the fullest extent permitted any
rights to relief it may have under 11 U.S.C. Section 362 in respect of the
Holder's exercise right. The Company hereby waives to the fullest extent
permitted any rights to relief it may have under 11 U.S.C. Section 362 in
respect of the exercise of the Warrant. The Company agrees, without cost or
expense to the Holder, to take or consent to any and all action necessary to
effectuate relief under 11 U.S.C. Section 362.

                  2.2. PAYMENT OF TAXES AND CHARGES. All shares of Common Stock
issuable upon the exercise of this Warrant pursuant to the terms hereof shall be
validly issued, fully paid and nonassessable, and without any preemptive rights.
The Company shall pay all expenses in connection with, and all taxes and other
governmental charges that may be imposed with respect to, the issue or delivery
thereof.

                  2.3. FRACTIONAL SHARES. The Company shall not be required to
issue a fractional share of Common Stock upon exercise of any Warrant. As to any
fraction of a share which Holder would otherwise be entitled to purchase upon
such exercise, the Company shall pay a cash adjustment in respect of such final
fraction in an amount equal to the same fraction of the Market Price per share
of Common Stock on the relevant exercise date.

                  2.4. CONTINUED VALIDITY. A holder of shares of Common Stock
issued upon the exercise of this Warrant, in whole or in part (other than a
holder who acquires such shares after the same have been publicly sold pursuant
to a Registration Statement under the Securities Act or sold pursuant to Rule
144 thereunder), shall continue to be entitled with respect to such shares to
all rights to which it would have been entitled as Holder under Sections 9, 10
and 14 of this Warrant. The Company will, at the time of exercise of this
Warrant, in whole or in part, upon the request of Holder, acknowledge in
writing, in form reasonably satisfactory to Holder, its continuing obligation to
afford Holder all such rights; PROVIDED, HOWEVER, that if Holder shall fail to
make any such request, such failure shall not affect the continuing obligation
of the Company to afford to Holder all such rights.

              2.5. RIGHT TO CONVERT WARRANT. The Holder shall have the right to
convert, in whole or in part, this Warrant (the "Conversion Right") at any
time prior to the expiration of the Exercise Period, into shares of Common
Stock in accordance with this Section 2.5, provided that such Conversion
Right shall not be available to the Holder in the event that the registration
statement filed pursuant to the Registration Rights Agreement covering the
Registrable Securities (as defined in the Registration Rights Agreement) is
effective. Upon exercise of the Conversion Right, the Company shall deliver
to the Holder (without payment by the Holder of the Warrant Price) that
number of shares of Common Stock equal to the quotient obtained by dividing
(x) the value of the portion of this Warrant being converted at the time the
Conversion Right is exercised (determined by subtracting the Warrant Price
for the portion of this Warrant being converted (in effect immediately prior
to the exercise of the Conversion Right) from the amount obtained by
multiplying the number of shares of Common Stock issuable upon the whole or
partial exercise of this Warrant, as the case may be, by the Market Price
immediately prior to the exercise of the Conversion Right)


<PAGE>

by (y) the Market Price of one share of Common Stock immediately prior to the
exercise of the Conversion Right.

                  The Conversion Right may be exercised by the Holder, at any
time or from time to time, prior to its expiration, on any business day by
delivering a written notice (the "Conversion Notice") to the Company at the
offices of the Company, exercising the Conversion Right and specifying (i) the
total number of shares of Common Stock the Holder will purchase pursuant to the
conversion and (ii) a place and date not less than two (2) nor more than twenty
(20) Business Days from the date of the Conversion Notice for the closing of
such purchase.

                  At any closing under this Section 2.5, (i) the Holder will
surrender this Warrant and (ii) the Company will deliver to the Holder a
certificate or certificates for the number of shares of Common Stock issuable
upon such conversion. If this Warrant shall have been converted only in part,
the Company shall, at the time of delivery of said stock certificate or
certificates, deliver to the Holder a new Warrant evidencing the rights of the
Holder to purchase the remaining shares of Common Stock called for by this
Warrant, which new Warrant shall in all other respects be identical to this
Warrant, or, at the request of the Holder, appropriate notation may be made on
this Warrant and the same returned to the Holder. The Company shall pay all
expenses, taxes and other charges payable in connection with the preparation,
issue and delivery of such stock certificates and new Warrants, except that, in
case such stock certificates and/or new Warrants shall be registered in a name
or names other than the name of the Holder, funds sufficient to pay all stock
transfer taxes that are payable upon the issuance of such stock certificates or
new Warrants shall be paid by the Holder at the time of delivering the notice of
exercise mentioned above.

3.   TRANSFER, DIVISION AND COMBINATION

                  3.1. TRANSFER. Subject to compliance with Sections 9, transfer
of this Warrant and all rights hereunder, in whole or in part, shall be
registered on the books of the Company to be maintained for such purpose, upon
surrender of this Warrant at the principal office of the Company referred to in
Section 2.1 or the office or agency designated by the Company pursuant to
Section 12, together with a written assignment of this Warrant substantially in
the form of EXHIBIT B hereto duly executed by Holder or its agent or attorney.
Upon such surrender, the Company shall, subject to Section 9, execute and
deliver a new Warrant or Warrants in the name of the assignee or assignees and
in the denomination specified in such instrument of assignment, and shall issue
to the assignor a new Warrant evidencing the portion of this Warrant not so
assigned, and this Warrant shall promptly be cancelled. A Warrant, if properly
assigned in compliance with Section 9, may be exercised by a new Holder for the
purchase of shares of Common Stock without having a new Warrant issued.
                  3.2. DIVISION AND COMBINATION. Subject to Section 9, this
Warrant may be divided or combined with other Warrants upon presentation hereof
at the aforesaid office or agency of the Company, together with a written notice
specifying the names and denominations in which new Warrants are to be issued,
signed by Holder or its agent or attorney. Subject to compliance with Section
3.1 and with Section 9, as to any transfer which may be involved in such
division or combination, the Company shall execute and deliver a new Warrant or
Warrants in exchange for the Warrant or Warrants to be divided or combined in
accordance with such notice.


<PAGE>

                  3.3. EXPENSES.  The Company shall prepare, issue and deliver
at its own expense the new Warrant or Warrants under this Section 3.

                  3.4. MAINTENANCE OF BOOKS. The Company agrees to maintain, at
its aforesaid office or agency, books for the registration and the registration
of transfer of the Warrants.

4.   ADJUSTMENTS

                  The number of shares of Common Stock for which this Warrant is
exercisable, or the price at which such shares may be purchased upon exercise of
this Warrant, shall be subject to adjustment from time to time as set forth in
this Section 4. The Company shall give Holder notice of any event described
below which requires an adjustment pursuant to this Section 4 at the time of
such event.

                  4.1. STOCK DIVIDENDS, SUBDIVISIONS AND COMBINATIONS. If at any
time the Company shall:

                           (a)      take a record of the holders of its Common
Stock for the purpose of entitling them to receive a dividend payable in, or
other distribution of, Additional Shares of Common Stock,

                           (b)      subdivide its outstanding shares of Common
Stock into a larger number of shares of Common Stock, or

                           (c)      combine its outstanding shares of Common
Stock into a smaller number of shares of Common Stock,

then (i) the number of shares of Common Stock for which this Warrant is
exercisable immediately after the occurrence of any such event shall be adjusted
to equal the number of shares of Common Stock which a record holder of the same
number of shares of Common Stock for which this Warrant is exercisable
immediately prior to the occurrence of such event would own or be entitled to
receive after the happening of such event, and (ii) the Current Warrant Price
shall be adjusted to equal (A) the Current Warrant Price multiplied by the
number of shares of Common Stock for which this Warrant is exercisable
immediately prior to the adjustment divided by (B) the number of shares for
which this Warrant is exercisable immediately after such adjustment.

                  4.2.     CERTAIN OTHER DISTRIBUTIONS.

                           (a)      If at any time prior to the Expiration Date
the Company shall take a record of the holders of its Common Stock for the
purpose of entitling them to receive any dividend or other distribution of:

                                          (i)  cash,
                                          (ii) any evidences of its
                            indebtedness, any shares of its stock or any other
                            securities or property of any nature whatsoever
                            (other than cash, Convertible Securities or
                            Additional Shares of Common Stock), or


<PAGE>

                                          (iii) any warrants or other rights to
                            subscribe for or purchase any evidences of its
                            indebtedness, any shares of its stock or any other
                            securities or property of any nature whatsoever
                            (other than cash, Convertible Securities or
                            Additional Shares of Common Stock),

then Holder shall be entitled to receive such dividend or distribution as if
Holder had exercised the Warrant. A reclassification of the Common Stock (other
than a change in par value, or from par value to no par value or from no par
value to par value) into shares of Common Stock and shares of any other class of
stock shall be deemed a distribution by the Company to the holders of its Common
Stock of such shares of such other class of stock within the meaning of this
Section 4.2 and, if the outstanding shares of Common Stock shall be changed into
a larger or smaller number of shares of Common Stock as a part of such
reclassification, such change shall be deemed a subdivision or combination, as
the case may be, of the outstanding shares of Common Stock within the meaning of
Section 4.1.

                           (b) In case the Company shall issue any Common Stock
or any rights, options or warrants to all holders of record of its Common Stock
(each an "Issuance") entitling all holders to subscribe for or purchase shares
of Common Stock at a price per share less than the Market Price per share of the
Common Stock on the date fixed for such issue, the Current Warrant Price in
effect immediately prior to the close of business on the date fixed for such
determination shall be reduced to the amount determined by multiplying such
Current Warrant Price by a fraction, the numerator of which shall be the number
of shares of Common Stock outstanding immediately prior to the close of business
on the date fixed for such determination plus the number of shares of Common
Stock which the aggregate of the offering price of the total number of shares of
Common Stock so offered for subscription or purchase would purchase at such
Market Price and the denominator of which shall be the number of shares of
Common Stock outstanding immediately prior to the close of business on the date
fixed for such determination plus the number of shares of Common Stock so
offered for subscription or purchase, such reduced amount to become effective
immediately after the close of business on the date fixed for such
determination. For the purposes of this clause (b), (i) the number of shares of
Common Stock at any time outstanding shall not include shares held in the
treasury of the Company and (ii) in the case of any rights, options or warrants
which expire by their terms not more than 60 days after the date of issue, sale,
grant or assumption thereof, no adjustment of the Current Warrant Price shall be
made until the expiration or exercise of all rights, options or warrants,
whereupon such adjustment shall be made in the manner provided in this clause
(b), but only with respect to the shares of Common Stock actually issued
pursuant thereto. Such adjustment shall be made successively whenever any event
specified above shall occur up to February 22, 2003. For Company Issuances after
February 22, 2003 no adjustment pursuant to this Section 4.2 shall be made. The
Company agrees to notify the Holders as soon as practical of any Issuances after
February 22, 2003 to allow reasonable time to convert. In the event that any or
all rights, options or warrants covered by this clause (b) are not so issued or
expire or terminate before being exercised, the Current Warrant Price then in
effect shall be appropriately readjusted.

                  4.3. OTHER PROVISIONS APPLICABLE TO ADJUSTMENTS UNDER THIS
SECTION. The following provisions shall be applicable to the making of
adjustments of the number of shares of


<PAGE>

Common Stock for which this Warrant is exercisable and the Current Warrant
Price provided for in this Section 4:

                           (a)      WHEN ADJUSTMENTS TO BE MADE.  The
adjustments required by this Section 4 shall be made whenever and as often as
any specified event requiring an adjustment shall occur. For the purpose of any
adjustment, any specified event shall be deemed to have occurred at the close of
business on the date of its occurrence.

                           (b)      FRACTIONAL INTERESTS.  In computing
adjustments under this Section 4, fractional interests in Common Stock shall be
taken into account to the nearest 1/10th of a share.

                           (c)      WHEN ADJUSTMENT NOT REQUIRED.  If the
Company shall take a record of the holders of its Common Stock for the purpose
of entitling them to receive a dividend or distribution or subscription or
purchase rights and shall, thereafter and before the distribution to
stockholders thereof, legally abandon its plan to pay or deliver such dividend,
distribution, subscription or purchase rights, then thereafter no adjustment
shall be required by reason of the taking of such record and any such adjustment
previously made in respect thereof shall be rescinded and annulled.

                           (d)      CHALLENGE TO GOOD FAITH DETERMINATION.
Whenever the Board of Directors of the Company shall be required to make a
determination in good faith of the fair value of any item under this Section 4,
such determination may be challenged in good faith by the Holder, and any
dispute shall be resolved by an investment banking firm of recognized national
standing selected by the Holder and reasonably acceptable to the Company.

                  4.4. REORGANIZATION, RECLASSIFICATION, MERGER, CONSOLIDATION
OR DISPOSITION OF ASSETS. In case the Company shall reorganize its capital,
reclassify its capital stock, consolidate or merge with or into another
corporation (where the Company is not the surviving corporation or where there
is a change in or distribution with respect to the Common Stock of the Company),
or sell, transfer or otherwise dispose of all or substantially all its property,
assets or business to another corporation and, pursuant to the terms of such
reorganization, reclassification, merger, consolidation or disposition of
assets, shares of common stock of the successor or acquiring corporation, or any
cash, shares of stock or other securities or property of any nature whatsoever
(including warrants or other subscription or purchase rights) in addition to or
in lieu of common stock of the successor or acquiring corporation ("Other
Property"), are to be received by or distributed to the holders of Common Stock
of the Company, then Holder shall have the right thereafter to receive, upon
exercise of the Warrant, the number of shares of common stock of the successor
or acquiring corporation or of the Company, if it is the surviving corporation,
and Other Property receivable upon or as a result of such reorganization,
reclassification, merger, consolidation or disposition of assets by a holder of
the number of shares of Common Stock for which this Warrant is exercisable
immediately prior to such event. In case of any such reorganization,
reclassification, merger, consolidation or disposition of assets, the successor
or acquiring corporation (if other than the Company) shall expressly assume the
due and punctual observance and performance of each and every covenant and
condition of this Warrant to be performed and observed by the Company and all
the obligations and liabilities hereunder, subject to such modifications as may
be deemed appropriate, subject to the
<PAGE>

Holder's consent, in order to provide for adjustments of shares of Common Stock
for which this Warrant is exercisable which shall be as nearly equivalent as
practicable to the adjustments provided for in this Section 4. For purposes of
this Section 4.4, "common stock of the successor or acquiring corporation"
shall include stock of such corporation of any class which is not preferred as
to dividends or assets over any other class of stock of such corporation and
which is not subject to redemption and shall also include any evidences of
indebtedness, shares of stock or other securities which are convertible into or
exchangeable for any such stock, either immediately or upon the arrival of a
specified date or the happening of a specified event and any warrants or other
rights to subscribe for or purchase any such stock. The foregoing provisions of
this Section 4.4 shall similarly apply to successive reorganizations,
reclassifications, mergers, consolidations or disposition of assets.

                  4.5. OTHER ACTION AFFECTING COMMON STOCK. In case at any time
or from time to time the Company shall take any action in respect of its Common
Stock, other than any action taken in the ordinary course of the Company's
business or any action described in this Section 4, which would have a material
adverse effect upon the rights of the Holder, the number of shares of Common
Stock and/or the purchase price thereof shall be adjusted in such manner as may
be equitable in the circumstances, as determined in good faith by an investment
bank selected by Holder.

                  4.6. CERTAIN LIMITATIONS. Notwithstanding anything herein to
the contrary, the Company agrees not to enter into any transaction which, by
reason of any adjustment hereunder, would cause the Current Warrant Price to be
less than the par value per share of Common Stock.

                  4.7. NO VOTING RIGHTS.  This Warrant shall not entitle its
Holder to any voting rights or other rights as a shareholder of the Company.

5.  NOTICES TO HOLDER

                  5.1. NOTICE OF ADJUSTMENTS. Whenever the number of shares of
Common Stock for which this Warrant is exercisable, or whenever the price at
which a share of such Common Stock may be purchased upon exercise of the
Warrants, shall be adjusted pursuant to Section 4, the Company shall forthwith
prepare a certificate to be executed by an executive officer of the Company
setting forth, in reasonable detail, the event requiring the adjustment and the
method by which such adjustment was calculated, specifying the number of shares
of Common Stock for which this Warrant is exercisable and (if such adjustment
was made pursuant to Section 4.4 or 4.5) describing the number and kind of any
other shares of stock or Other Property for which this Warrant is exercisable,
and any change in the purchase price or prices thereof, after giving effect to
such adjustment or change. The Company shall promptly cause a signed copy of
such certificate to be delivered to the Holder in accordance with Section 14.2.
The Company shall keep at its office or agency designated pursuant to Section 12
copies of all such certificates and cause the same to be available for
inspection at said office during normal business hours by the Holder, its
representatives, or any prospective purchaser of a Warrant designated by the
Holder.

                  5.2. NOTICE OF CORPORATE ACTION.  If at any time

                       (a)  the Company shall take a record of the holders of
its Common Stock

<PAGE>

for the purpose of entitling them to receive a dividend or other distribution,
or any right to subscribe for or purchase any evidences of its indebtedness,
any shares of stock of any class or any other securities or property, or to
receive any other right, or

                       (b)  there shall be any capital reorganization of the
Company, any reclassification or recapitalization of the capital stock of the
Company or any consolidation or merger of the Company with, or any sale,
transfer or other disposition of all or substantially all the property,
assets or business of the Company to, another corporation, or

                       (c)  there shall be a voluntary or involuntary
dissolution, liquidation or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at
least thirty (30) Business Days' prior written notice of the date on which a
record date shall be selected for such dividend, distribution or right or for
determining rights to vote in respect of any such reorganization,
reclassification, merger, consolidation, sale, transfer, disposition,
dissolution, liquidation or winding up, and (ii) in the case of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, dissolution, liquidation or winding up, at least thirty (30)
Business Days' prior written notice of the date when the same shall take place.
Such notice in accordance with the foregoing clause also shall specify (i) the
date on which any such record is to be taken for the purpose of such dividend,
distribution or right, the date on which the holders of Common Stock shall be
entitled to any such dividend, distribution or right, and the amount and
character thereof, and (ii) the date on which any such reorganization,
reclassification, merger, consolidation, sale, transfer, disposition,
dissolution, liquidation or winding up is to take place and the time, if any
such time is to be fixed, as of which the holders of Common Stock shall be
entitled to exchange their shares of Common Stock for securities or other
property deliverable upon such reorganization, reclassification, merger,
consolidation, sale, transfer, disposition, dissolution, liquidation or winding
up. Each such written notice shall be sufficiently given if addressed to Holder
at the last address of Holder appearing on the books of the Company and
delivered in accordance with Section 14.2.

6.  NO IMPAIRMENT

                  The Company shall not by any action, including, without
limitation, amending its certificate of incorporation or through any
reorganization, transfer of assets, consolidation, merger, dissolution, issue or
sale of securities or any other voluntary action, avoid or seek to avoid the
observance or performance of any of the terms of this Warrant, but will at all
times in good faith assist in the carrying out of all such terms and in the
taking of all such actions as may be necessary or appropriate to protect the
rights of Holder against impairment. Without limiting the generality of the
foregoing, the Company will (a) not increase the par value of any shares of
Common Stock receivable upon the exercise of this Warrant above the amount
payable therefor upon such exercise immediately prior to such increase in par
value, (b) take all such action as may be necessary or appropriate in order
that the Company may validly and legally issue fully paid and nonassessable
shares of Common Stock upon the exercise of this Warrant, and (c) use its
best efforts to obtain all such authorizations, exemptions or consents from
any public regulatory body having jurisdiction thereof as may be necessary to
enable the Company to perform its obligations under this Warrant.

<PAGE>

                  Upon the request of Holder, the Company will at any time
during the period this Warrant is outstanding acknowledge in writing, in form
reasonably satisfactory to Holder, the continuing validity of this Warrant and
the obligations of the Company hereunder.

7.  RESERVATION AND AUTHORIZATION OF COMMON STOCK

                  From and after the Initial Closing Date, the Company shall at
all times reserve and keep available for issue upon the exercise of Warrants
such number of its authorized but unissued shares of Common Stock as will be
sufficient to permit the exercise in full of all outstanding Warrants. All
shares of Common Stock which shall be so issuable, when issued upon exercise of
any Warrant and payment therefor in accordance with the terms of such Warrant,
shall be duly and validly issued and fully paid and nonassessable, and not
subject to preemptive rights.

                  Before taking any action which would cause an adjustment
reducing the Current Warrant Price below the then par value, if any, of the
shares of Common Stock issuable upon exercise of the Warrants, the Company shall
take any corporate action which may be necessary in order that the Company may
validly and legally issue fully paid and non-assessable shares of such Common
Stock at such adjusted Current Warrant Price.

                  Before taking any action which would result in an adjustment
in the number of shares of Common Stock for which this Warrant is exercisable or
in the Current Warrant Price, the Company shall obtain all such authorizations
or exemptions thereof, or consents thereto, as may be necessary from any public
regulatory body or bodies having jurisdiction thereof.

8.  TAKING OF RECORD; STOCK AND WARRANT TRANSFER BOOKS

                  In the case of all dividends or other distributions by the
Company to the holders of its Common Stock with respect to which any provision
of Section 4 refers to the taking of a record of such holders, the Company will
in each such case take such a record as of the close of business on a Business
Day. The Company will not at any time close its stock transfer books or Warrant
transfer books so as to result in preventing or delaying the exercise or
transfer of any Warrant.

9.  RESTRICTIONS ON TRANSFERABILITY

                  The Warrants and the Warrant Stock shall not be transferred,
hypothecated or assigned before satisfaction of the conditions specified in this
Section 9, which conditions are intended to ensure compliance with the
provisions of the Securities Act with respect to the Transfer of any Warrant or
any Warrant Stock. Holder, by acceptance of this Warrant, agrees to be bound by
the provisions of this Section 9.

                  9.1. RESTRICTIVE LEGEND. The Holder by accepting this Warrant
and any Warrant Stock agrees that this Warrant and the Warrant Stock issuable
upon exercise hereof may not be assigned or otherwise transferred unless and
until (i) the Company has received an opinion of counsel for the Holder that
such securities may be sold pursuant to an exemption from registration under the
Securities Act or (ii) a registration statement relating to such securities has
been filed by the Company and declared effective by the Commission.

<PAGE>

                           (a) Each certificate for Warrant Stock issuable
hereunder shall bear a legend substantially worded as follows unless such
securities have been sold pursuant to an effective registration statement under
the Securities Act:

                               "The securities represented by this
              certificate have not been registered under the Securities Act
              of 1933, as amended (the "Act") or any state securities laws.
              The securities may not be offered for sale, sold, assigned,
              offered, transferred or otherwise distributed for value except
              (i) pursuant to an effective registration statement under the
              Act or any state securities laws or (ii) pursuant to an
              exemption from registration or prospectus delivery requirements
              under the Act or any state securities laws in respect of which
              the Company has received an opinion of counsel satisfactory to
              the Company to such effect. Copies of the agreement covering
              both the purchase of the securities and restricting their
              transfer may be obtained at no cost by written request made by
              the holder of record of this certificate to the Secretary of
              the Company at the principal executive offices of the Company."

                           (b) Except as otherwise provided in this Section 9,
the Warrant shall be stamped or otherwise imprinted with a legend in
substantially the following form:

                               "This Warrant and the securities represented
              hereby have not been registered under the Securities Act of
              1933, as amended, or any state securities laws and may not be
              transferred in violation of such Act, the rules and regulations
              thereunder or any state securities laws or the provisions of
              this Warrant."

                  9.2. NOTICE OF PROPOSED TRANSFERS. Prior to any Transfer or
attempted Transfer of any Warrants or any shares of Restricted Common Stock, the
Holder shall give five (5) days' prior written notice (a "Transfer Notice") to
the Company of Holder's intention to effect such Transfer, describing the manner
and circumstances of the proposed Transfer, and obtain from counsel to Holder an
opinion that the proposed Transfer of such Warrants or such Restricted Common
Stock may be effected without registration under the Securities Act or state
securities laws. After the Company's receipt of the Transfer Notice and opinion,
such Holder shall thereupon be entitled to Transfer such Warrants or such
Restricted Common Stock, in accordance with the terms of the Transfer Notice.
Each certificate, if any, evidencing such shares of Restricted Common Stock
issued upon such Transfer and the Warrant issued upon such Transfer shall bear
the restrictive legends set forth in Section 9.1, unless in the opinion of such
counsel such legend is not required in order to ensure compliance with the
Securities Act.

                  9.3. REQUIRED REGISTRATION. Pursuant to the terms and
conditions set forth in the

<PAGE>

Registration Rights Agreement, the Company shall prepare and file with the
Commission not later than the thirtieth (30th) day after the Initial Closing
Date, a Registration Statement relating to the offer and sale of the Common
Stock issuable upon exercise of the Warrants and shall use its best efforts to
cause the Commission to declare such Registration Statement effective in
accordance with the terms set forth in Section 2(a) of the Registration Rights
Agreement.

                  9.4. TERMINATION OF RESTRICTIONS. Notwithstanding the
foregoing provisions of Section 9, the restrictions imposed by this Section upon
the transferability of the Warrants, the Warrant Stock and the Restricted Common
Stock (or Common Stock issuable upon the exercise of the Warrants) and the
legend requirements of Section 9.1 shall terminate as to any particular Warrant
or share of Warrant Stock or Restricted Common Stock (or Common Stock issuable
upon the exercise of the Warrants) (i) when and so long as such security shall
have been effectively registered under the Securities Act and applicable state
securities laws and disposed of pursuant thereto or (ii) when the Company shall
have received an opinion of counsel that such shares may be transferred without
registration thereof under the Securities Act and applicable state securities
laws. Whenever the restrictions imposed by Section 9 shall terminate as to this
Warrant, as hereinabove provided, the Holder hereof shall be entitled to receive
from the Company upon written request of the Holder, at the expense of the
Company, a new Warrant bearing the following legend in place of the restrictive
legend set forth hereon:

                       "THE RESTRICTIONS ON TRANSFERABILITY OF THE WITHIN
              WARRANT CONTAINED IN SECTION 9 HEREOF TERMINATED ON ________,
              20__, AND ARE OF NO FURTHER FORCE AND EFFECT."

All Warrants issued upon registration of transfer, division or combination of,
or in substitution for, any Warrant or Warrants entitled to bear such legend
shall have a similar legend endorsed thereon. Whenever the restrictions imposed
by this Section shall terminate as to any share of Restricted Common Stock, as
hereinabove provided, the holder thereof shall be entitled to receive from the
Company, at the Company's expense, a new certificate representing such Common
Stock not bearing the restrictive legends set forth in Section 9.1.

                  9.5. LISTING ON SECURITIES EXCHANGE. If the Company shall list
any shares of Common Stock on any securities exchange, it will, at its expense,
list thereon, maintain and, when necessary, increase such listing of, all shares
of Common Stock issued or, to the extent permissible under the applicable
securities exchange rules, issuable upon the exercise of this Warrant so long as
any shares of Common Stock shall be so listed during the Exercise Period.

10.  SUPPLYING INFORMATION

                  The Company shall cooperate with Holder in supplying such
information as may be reasonably necessary for Holder to complete and file any
information reporting forms presently or hereafter required by the Commission as
a condition to the availability of an exemption from the Securities Act for the
sale of any Warrant or Restricted Common Stock.

<PAGE>

11.  LOSS OR MUTILATION

                  Upon receipt by the Company from Holder of evidence reasonably
satisfactory to it of the ownership of and the loss, theft, destruction or
mutilation of this Warrant and indemnity reasonably satisfactory to it (it being
understood that the written agreement of the Holder shall be sufficient
indemnity), and in case of mutilation upon surrender and cancellation hereof,
the Company will execute and deliver in lieu hereof a new Warrant of like tenor
to Holder; PROVIDED, in the case of mutilation, no indemnity shall be required
if this Warrant in identifiable form is surrendered to the Company for
cancellation.

12.  OFFICE OF THE COMPANY

                  As long as any of the Warrants remain outstanding, the Company
shall maintain an office or agency (which may be the principal executive offices
of the Company) where the Warrants may be presented for exercise, registration
of transfer, division or combination as provided in this Warrant, such office to
be initially located at 15400 Knoll Trail, Suite #200, Dallas, Texas 75248, fax
(972) 960-9395, provided, however, that the Company shall provide prior written
notice to Holder of a change in address no less than thirty (30) days prior to
such change.

13.  LIMITATION OF LIABILITY

                  No provision hereof, in the absence of affirmative action by
Holder to purchase shares of Common Stock, and no enumeration herein of the
rights or privileges of Holder hereof, shall give rise to any liability of
Holder for the purchase price of any Common Stock or as a stockholder of the
Company, whether such liability is asserted by the Company or by creditors of
the Company.

14.  MISCELLANEOUS

                  14.1. NONWAIVER AND EXPENSES. No course of dealing or any
delay or failure to exercise any right hereunder on the part of Holder shall
operate as a waiver of such right or otherwise prejudice Holder's rights, powers
or remedies, notwithstanding all rights hereunder terminate on the Expiration
Date. If the Company fails to make, when due, any payments provided for
hereunder, or fails to comply with any other provision of this Warrant, the
Company shall pay to Holder such amounts as shall be sufficient to cover any
direct and indirect losses, damages, costs and expenses including, but not
limited to, reasonable attorneys' fees, including those of appellate
proceedings, incurred by Holder in collecting any amounts due pursuant hereto or
in otherwise enforcing any of its rights, powers or remedies hereunder.

                  14.2. NOTICE GENERALLY. Except as may be otherwise provided
herein, any notice or other communication or delivery required or permitted
hereunder shall be in writing and shall be delivered personally or sent by
certified mail, postage prepaid, or by a nationally recognized overnight courier
service, and shall be deemed given when so delivered personally or by overnight
courier service, or, if mailed, three (3) days after the date of deposit in the
United States mails, as follows:

<PAGE>

                                (1) if to the Company, to:

                                    Airtech International Group, Inc.
                                    15400 Knoll Trail, Suite #200
                                    Dallas, Texas  75248
                                    Attention: C.J. Comu, CEO
                                    Tel: (972) 960-9400 x111
                                    Fax: (972)960-9395

                                (2) if to the Purchaser to:

                                    PK Investors LLC
                                    WEC Asset Management LLC
                                    110 Colabaugh Pond Road
                                    Croton-on-Hudson, New York  10520
                                    Attention: Daniel J. Saks
                                    Tel: (914) 271-2211
                                    Fax: (914) 271-0889

with a copy to:
                                    Pryor Cashman Sherman & Flynn LLP
                                    410 Park Avenue
                                    New York, New York  10022
                                    Attention: Mark Saks, Esq.
                                    Tel: (212) 326-0140
                                    Fax: (212) 326-0806

     The Company or the Holder may change the foregoing address by notice given
pursuant to this Section 14.2.

                  14.3. INDEMNIFICATION. The Company agrees to indemnify and
hold harmless Holder from and against any liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, claims, costs, attorneys' fees,
expenses and disbursements of any kind which may be imposed upon, incurred by or
asserted against Holder in any manner relating to or arising out of any failure
by the Company to perform or observe in any respect any of its covenants,
agreements, undertakings or obligations set forth in this Warrant.

                  14.4. REMEDIES. Holder in addition to being entitled to
exercise all rights granted by law, including recovery of damages, will be
entitled to specific performance of its rights under this Warrant. The Company
agrees that monetary damages would not be adequate compensation for any loss
incurred by reason of a breach by it of the provisions of this Warrant and
hereby agrees to waive the defense in any action for specific performance that a
remedy at law would be adequate.

                  14.5. SUCCESSORS AND ASSIGNS. Subject to the provisions of
Sections 3.1 and 9, this Warrant and the rights evidenced hereby shall inure to
the benefit of and be binding upon the successors of the Company and the
successors and assigns of Holder. The provisions of this Warrant

<PAGE>

are intended to be for the benefit of all Holders from time to time of this
Warrant and, with respect to Section 9 hereof, holders of Warrant Stock, and
shall be enforceable by any such Holder or holder of Warrant Stock.

                  14.6. AMENDMENT. This Warrant and all other Warrants may be
modified or amended or the provisions hereof waived only with the prior written
consent of the Company and the Holder.

                  14.7. SEVERABILITY. Wherever possible, each provision of this
Warrant shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Warrant shall be prohibited by or
invalid under applicable law, such provision shall be ineffective to the extent
of such prohibition or invalidity, without invalidating the remainder of such
provision or the remaining provisions of this Warrant.

                  14.8. HEADINGS. The headings used in this Warrant are for the
convenience of reference only and shall not, for any purpose, be deemed a part
of this Warrant.

                  14.9. GOVERNING LAW. This Warrant shall be governed by the
laws of the State of New York, without regard to the provisions thereof relating
to conflict of laws. The Company consents to the jurisdiction of the federal
courts whose districts encompass any part of the City of New York or the state
courts of the State of New York sitting in the City of New York in connection
with any dispute arising under this Warrant or any of the transactions
contemplated hereby, and hereby waives, to the maximum extent permitted by law,
any objection, including any objections based on FORUM NON CONVENIENS, to the
bringing of any such proceeding in such jurisdictions.


         [SIGNATURE PAGE FOLLOWS, REMAINDER OF PAGE INTENTIONALLY BLANK]
IN WITNESS WHEREOF, the Company has caused this Warrant to be duly executed and
its corporate seal to be impressed hereon and attested by its Secretary or an
Assistant Secretary.


Dated:  February 22, 2000


                                       AIRTECH INTERNATIONAL GROUP, INC.

                                       By:______________________________________
                                          Name:
                                          Title:

Attest:

<PAGE>

By:___________________________
   Name:
   Title:

EXHIBIT A

SUBSCRIPTION FORM

                [To be executed only upon exercise of Warrant]


The undersigned registered owner of this Warrant irrevocably exercises this
Warrant for the purchase of ______ Shares of Common Stock of Airtech
International Group, Inc., and herewith makes payment therefor in cash or by
check or bank draft made payable to the Company, all at the price and on the
terms and conditions specified in this Warrant and requests that certificates
for the shares of Common Stock hereby purchased (and any securities or other
property issuable upon such exercise) be issued in the name of and delivered to
_____________ whose address is _________________ and whose Federal
Identification Number is ________________and, if such shares of Common Stock
shall not include all of the shares of Common Stock issuable as provided in this
Warrant, that a new Warrant of like tenor and date for the balance of the shares
of Common Stock issuable hereunder be delivered to the undersigned.


                                        -------------------------------
                                        (Name of Registered Owner)


                                        -------------------------------
                                        (Signature of Registered Owner)


                                        -------------------------------
                                        (Street Address)


                                        -------------------------------
                                        (City)  (State)    (Zip Code)


         NOTICE: The signature on this subscription must correspond with the
name as written upon the face of the within Warrant in every particular, without
alteration or enlargement or any change whatsoever.

<PAGE>

EXHIBIT B

ASSIGNMENT FORM


                  FOR VALUE RECEIVED the undersigned registered owner of this
Warrant hereby sells, assigns and transfers unto the Assignee named below all of
the rights of the undersigned under this Warrant, with respect to the number of
shares of Common Stock set forth below:

<TABLE>
<CAPTION>

      Name and                          Federal                 Number of Shares
Address of Assignee               Identification Number         of Common Stock
-------------------               ---------------------         ----------------
<S>                               <C>                           <C>

</TABLE>




and does hereby irrevocably constitute and appoint _______ ________________
attorney-in-fact to register such transfer on the books of Airtech International
Group, Inc., maintained for the purpose, with full power of substitution in the
premises.


     Dated:___________________              Print Name:___________________

                                            Signature:____________________

                                            Witness:______________________



         NOTICE: The signature on this assignment must correspond with the name
as written upon the face of the within Warrant in every particular, without
alteration or enlargement or any change whatsoever.