Document:

PATENT SECURITY AGREEMENT

                  This PATENT SECURITY AGREEMENT (this "Patent Security
Agreement") is made this 19th day of June, 2007, by and among Kronos Advanced
Technologies, Inc., a Nevada corporation with its chief executive office and
principal place of business located at 464 Common Street, Box 301, Belmont,
Massachusetts 02478 (the "Debtor") and Kronos Air Technologies, Inc. a Nevada
corporation with its chief executive office and principal place of business
located at 15241 NE 90th Street, Redmond, Washington 98052 (the "Subsidiary" and
collectively with the Debtor, the "Pledgors"), and AirWorks Funding LLLP, a
Georgia limited liability limited partnership, ("AirWorks"), Sands Brother
Venture Capital LLC, a New York limited liability company ("Sands I"), Sands
Brothers Venture Capital II LLC, a New York limited liability company ("Sands
II"), Sands Brothers Venture Capital III LLC, a New York limited liability
company ("Sands III"), Sands Brothers Venture Capital IV LLC, a New York limited
liability company ("Sands IV"), Critical Capital Growth Fund, L.P., a Delaware
limited partnership and a debenture licensed U.S. Small Business Investment
Company ("CCGF") and RS Properties I LLC, a Delaware limited liability company
("RS Properties"). AirWorks, Sands I, Sands II, Sands III, Sands IV, CCGF and RS
Properties are collectively referred to herein as the "Secured Parties".

                              W I T N E S S E T H:

                  WHEREAS, pursuant to that certain Funding Agreement dated as
of the date hereof (as amended, restated, supplemented or otherwise modified
from time to time, the "Funding Agreement") by and among the Debtor and the
Secured Parties, the Secured Parties are willing to make certain financial
accommodations available to Debtor pursuant to the terms and conditions thereof;
and

                  WHEREAS, the Subsidiary is a direct subsidiary of the Debtor
and has determined that its execution, delivery and performance of this Patent
Security Agreement directly or indirectly benefits, and is within the corporate
purposes and in the best interest of, it; and

                  WHEREAS, the Secured Parties are willing to make the financial
accommodations to Borrower as provided for in the Funding Agreement, but only
upon the condition, among others, that the Pledgors shall have executed and
delivered to the Secured Parties this Patent Security Agreement (including all
annexes, exhibits or schedules thereto, as from time to time amended, restated,
supplemented or otherwise modified, the "Patent Security Agreement") and that
certain other Security Agreement of even date herewith by and among the Pledgors
and the Secured Parties (the "Security Agreement");

                  NOW, THEREFORE, in consideration of the premises and mutual
covenants herein contained and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Pledgors hereby
agree as follows:

         1. DEFINED TERMS. All capitalized terms used but not otherwise defined
herein have the meanings given to them in the Security Agreement and Funding
Agreement.

<PAGE>

         2. GRANT OF SECURITY INTEREST IN PATENT COLLATERAL. Each Pledgor hereby
grants to the Secured Parties a continuing first priority security interest in
all of such Pledgor's right, title and interest in, to and under the following,
whether presently existing or hereafter created or acquired (collectively, the
"Patent Collateral"):

(a) all of such Pledgor's patents, license agreements for the commercialization
of patents and patent applications to which it is a party, including, in each
case, those referred to on Schedule I hereto;

(b) all reissues, continuations or extensions of the foregoing; and

(c) all products and proceeds of the foregoing, including any claim by such
Pledgor against third parties for past, present or future infringement or
dilution of any Patent Collateral.

         3. SECURITY FOR OBLIGATIONS. This Patent Security Agreement and the
security interest evidenced hereby secures the payment and performance of all
the Obligations, whether now existing or arising hereafter. Without limiting the
generality of the foregoing, this Patent Security Agreement secures the payment
of all amounts which constitute part of the Obligations and would be owed by the
Pledgors, or any of them, to the Secured Parties or any of them, whether or not
they are unenforceable or not allowable due to the existence of an insolvency
proceeding involving a Pledgor. The Pledgors hereby authorize the Secured
Parties to file this Patent Security Agreement with the United States Patent and
Trademark Office.

         4. SECURITY AGREEMENT. The security interests granted pursuant to this
Patent Security Agreement are granted in conjunction with the security interests
granted to the Secured Parties pursuant to the Security Agreement. Each Pledgor
hereby acknowledges and affirms that the rights and remedies of the Secured
Parties with respect to the security interest in the Patent Collateral made and
granted hereby are more fully set forth in the Security Agreement, the terms and
provisions of which are incorporated by reference herein as if fully set forth
herein.

         5. AUTHORIZATION TO SUPPLEMENT. The Pledgors shall give the Secured
Parties prompt notice in writing of any additional United States patent
registrations or applications therefor after the date hereof. The Pledgors
hereby authorize the Secured Parties unilaterally to modify this Agreement by
amending Schedule I to include any future United States registered patents or
applications therefor of the Pledgors. Notwithstanding the foregoing, no failure
to so modify this Patent Security Agreement or amend Schedule I shall in any way
affect, invalidate or detract from Agent's continuing security interest in all
the Patent Collateral, whether or not listed on Schedule I.

2. COUNTERPARTS. This Patent Security Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
separate counterparts shall together constitute but one and the same instrument.
Any signatures delivered by a party by facsimile transmission or by e-mail
transmission shall be deemed an original signature hereto.

<PAGE>

3. CONSTRUCTION. Unless the context of this Patent Security Agreement or any
other Transaction Document clearly requires otherwise, references to the plural
include the singular, references to the singular include the plural, the terms
"includes" and "including" are not limiting, and the term "or" has, except where
otherwise indicated, the inclusive meaning represented by the phrase "and/or."
The words "hereof," "herein," "hereby," "hereunder," and similar terms in this
Patent Security Agreement or any other Transaction Document refer to this Patent
Security Agreement or such other Transaction Document, as the case may be, as a
whole and not to any particular provision of this Patent Security Agreement or
such other Transaction Document, as the case may be. Section, subsection,
clause, schedule, and exhibit references herein are to this Patent Security
Agreement unless otherwise specified. Any reference in this Patent Security
Agreement or in any other Transaction Document to any agreement, instrument, or
document shall include all alterations, amendments, changes, extensions,
modifications, renewals, replacements, substitutions, joinders, and supplements,
thereto and thereof, as applicable (subject to any restrictions on such
alterations, amendments, changes, extensions, modifications, renewals,
replacements, substitutions, joinders, and supplements set forth herein). Any
reference herein to any Person shall be construed to include such Person's
successors and assigns.

                            [SIGNATURE PAGE FOLLOWS]

<PAGE>

Patent Security Agreement

Patent Security Agreement

                  IN WITNESS WHEREOF, each Pledgor has caused this Patent
Security Agreement to be executed and delivered by its duly authorized officer
as of the date first set forth above.

                       KRONOS ADVANCED TECHNOLOGIES, INC.

                                        By:     /s/ Richard F. Tusing
                                                --------------------------------
                                        Name:   Richard F. Tusing
                                        Title:  COO

                                        KRONOS AIR TECHNOLOGIES, INC.

                                        By:     /s/ Richard F. Tusing
                                                --------------------------------
                                        Name:   Richard F. Tusing
                                        Title:  COO

                                        AIRWORKS FUNDING LLLP

                                        By:  Compass Partners, LLC, its general
                                        partner

                                        By:     /s/ Richard E. Perlman
                                                --------------------------------
                                        Name:   Richard E. Perlman
                                        Title:  President

                                        SANDS BROTHERS VENTURE CAPITAL LLC

                                        By:     /s/ Scott A. Baily
                                                --------------------------------
                                        Name:   Scott A. Baily
                                        Title:  COO

                                        SANDS BROTHERS VENTURE CAPITAL II LLC

                                        By:     /s/ Scott A. Baily
                                                --------------------------------
                                        Name:   Scott A. Baily
                                        Title:  COO

<PAGE>

                                        SANDS BROTHERS VENTURE CAPITAL III LLC

                                        By:     /s/ Scott A. Baily
                                                --------------------------------
                                        Name:   Scott A. Baily
                                        Title:  COO

                                        SANDS BROTHERS VENTURE CAPITAL IV LLC

                                        By:     /s/ Scott A. Baily
                                                --------------------------------
                                        Name:   Scott A. Baily
                                        Title:  COO

                                        CRITICAL CAPITAL GROWTH FUND, L.P.

                                        By:  Critical Capital, L.P., its General
                                             Partner

                                        By:  Critical Capital Corporation, its
                                             General Partner

                                        By:     /s/ Steven B. Sands
                                                --------------------------------
                                        Name:   Steven B. Sands
                                        Title:  Chairman

                                        By:     /s/ Charles L. Robinson
                                                --------------------------------
                                        Name:   Charles L. Robinson
                                        Title:  President

                                        RS PROPERTIES I LLC

                                        By:     /s/ John Lack
                                                --------------------------------
                                        Name:   John Lack
                                        Title:  Manager

<PAGE>

                                   SCHEDULE I
                                       TO
                            PATENT SECURITY AGREEMENT

                              PATENT REGISTRATIONS
<TABLE>
<CAPTION>

   Case Ref.               Title               Case Status       Application No.        Registration No.           Country

<S>              <C>
                 ELECTROSTATIC FLUID
WO-432001AU      ACCELERATOR                   Exam requested        10847/01               773626                Australia

                 ELECTROSTATIC FLUID
WO-432001AU2     ACCELERATOR                   Pending               2004205310                                   Australia

                 ELECTROSTATIC FLUID
WO-432001CA      ACCELERATOR                   Pending               2,355,659                                      Canada

                 ELECTROSTATIC FLUID           Application
WO-432001EP      ACCELERATOR                   Filed                 00972147.3                             European Patent Office

                 ELECTROSTATIC FLUID
WO-432001HK      ACCELERATOR                   Published             02103656.7                                   Hong Kong

                 ELECTROSTATIC FLUID           Application
WO-432001JP      ACCELERATOR                   Filed                 2001-530889                                    Japan

                 ELECTROSTATIC FLUID
WO-432001MX      ACCELERATOR                   Issued                PA/a/2001/006037       233725                  Mexico

                 ELECTROSTATIC FLUID
WO-432002        ACCELERATOR                   Issued                09/419,720          6,504,308         United States of America

                 Electrostatic Fluid           Application
WO-432002RE      Accelerator                   Filed                 90/007,276                            United States of America

                 SPARK MANAGEMENT METHOD
WO-432003        AND DEVICE                    Issued                10/187,983          6,937,455         United States of America

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a       Application
WO-432003AU      Fluid Flow                    Filed                 2003247600                                   Australia

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a
WO-432003CA      Fluid Flow                    Issued                2,489,983           2,489,983                  Canada

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A
WO-432003CN      FLUID FLOW                    Published             03819690.5                                     China

                 SPARK MANAGEMENT METHOD
WO-432003CON     AND DEVICE                    Published             11/214,066                            United States of America

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A      Application
WO-432003EP      FLUID FLOW                    Filed                 03812413.7                             European Patent Office

<PAGE>

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A      Application
WO-432003HK      FLUID FLOW                    Filed                 05111239.3                                   Hong Kong

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A
WO-432003JP      FLUID FLOW                    Exam requested        570752/2004                                    Japan

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a
WO-432003MX      Fluid Flow                    Published             PA/a/2004/012882                               Mexico

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a       Examination
WO-432003NZ      Fluid Flow                    report received       537254                                      New Zealand

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A      Entered
WO-432003PCT     FLUID FLOW                    National Phase        PCT/US03/19651                       Patent Cooperation Treaty

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A
WO-432004        FLUID FLOW                    Issued                10/175,947          6,664,741         United States of America

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A
WO-432004CIP     FLUID FLOW                    Issued                10/735,302          6,963,479         United States of America

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP AU  FLUID FLOW                    Filed                 2004305030                                   Australia

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP CA  FLUID FLOW                    Filed                 2,550,582                                      Canada

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP CN  FLUID FLOW                    Filed                 200480041683.X                                 China

                 METHOD OF ELECTROSTATIC       Application
WO-432004CIP CON ACCELERATION OF A FLUID       Filed                 11/549,845                            United States of America

<PAGE>

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP EP  FLUID FLOW                    Filed                 04813494.4                             European Patent Office

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP HK  FLUID FLOW                    Filed                 06114151.0                                   Hong Kong

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP JP  FLUID FLOW                    Filed                 To Be Assigned                                 Japan

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP MX  FLUID FLOW                    Filed                 PA/a/2006/006757                               Mexico

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A     Application
WO-432004CIP NZ  FLUID FLOW                    Filed                 547900                                      New Zealand

                 Method of and apparatus
                 for electrostatic fluid
                 acceleration control of a
WO-432004CIPDIV  fluid flow                    Issued                11/210,773          7,122,070         United States of America

                 METHOD OF AND APPARATUS
                 FOR ELECTROSTATIC FLUID
                 ACCELERATION CONTROL OF A
WO-432004CIPPCT  FLUID FLOW                    Published             PCT/US2004/041181                    Patent Cooperation Treaty

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTR OLLING
WO-432005        FLUID FLOW                    Issued                10/188,069          6,727,657         United States of America

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING
WO-432005CIP     FLUID FLOW                    Issued                10/847,438          7,053,565         United States of America

<PAGE>

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 AU     FLUID FLOW                    Filed                                                              Australia

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 CA     FLUID FLOW                    Filed                                                                Canada

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 CN     FLUID FLOW                    Filed                                                                China

                                               Application
                 AN ELECTROSTATIC FLUID        Filed -
                 ACCELERATOR FOR AND A         Awaiting
                 METHOD OF CONTROLLING         Confirmation
WO-432005 EA     FLUID FLOW                    from FA                                                      Eurasian Patent Office

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 EP     FLUID FLOW                    Filed                 05 750 980.4                           European Patent Office

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 JP     FLUID FLOW                    Filed                 PCT/US2005/017276                              Japan

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 MX     FLUID FLOW                    Filed                 PCT/US2005/017276                              Mexico

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432005 NZ     FLUID FLOW                    Filed                                                             New Zealand

                                               Application
                 AN ELECTROSTATIC FLUID        Filed -
                 ACCELERATOR FOR AND A         Awaiting
                 METHOD OF CONTROLLING         Confirmation
WO-432005 UA     FLUID FLOW                    from FA                                                             Ukraine

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTR OLLING        Examination
WO-432005CIPPCT  FLUID FLOW                    report received       PCT/US05/017276                      Patent Cooperation Treaty

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTR OLLING
WO-432005CON     FLUID FLOW                    Allowed               10/806,473                            United States of America

<PAGE>

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROL LING A
WO-432006        FLUID FLOW                    Issued                10/352,193          6,919,698         United States of America

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a
WO-432006CON     Fluid Flow                    Allowed               11/046,711                            United States of America

                 ELECTROSTATIC FLUID
WO-432007        ACCELERATOR                   Issued                10/295,869          6,888,314         United States of America

                 Electrostatic Fluid
WO-432007CON     Accelerator                   Published             11/119,748                            United States of America

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF
WO-432010        OPERATING THE SAME            Allowed               10/724,707                            United States of America

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF       Application
WO-432010-AU     OPERATING THE SAME            Filed                 2004296485                                   Australia

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF       Application
WO-432010-CA     OPERATING THE SAME            Filed                 2,547,951                                      Canada

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF       Application
WO-432010-CN     OPERATING THE SAME            Filed                 200480041207.8                                 China

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF
WO-432010-EP     OPERATING THE SAME            Exam requested        04816999.9                             European Patent Office

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF       Application
WO-432010-JP     OPERATING THE SAME            Filed                 100064746                                      Japan

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF
WO-432010-MX     OPERATING THE SAME            Published             PA/A/2006/006296                               Mexico

<PAGE>

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF       Application
WO-432010NZ      OPERATING THE SAME            Filed                 547475                                      New Zealand

                 CORONA DISCHARGE
                 ELECTRODE AND METHOD OF
WO-432010PCT     OPERATING THE SAME            Exam requested        PCT/US04/39783                       Patent Cooperation Treaty

                 ELECTROSTATIC AIR
WO-432011        CLEANING DEVICE               Issued                10/752,530          7,150,780         United States of America

                 ELECTROSTATIC AIR             Application
WO-432011CON     CLEANING DEVICE               Filed                 11/612,270                            United States of America

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a       Application
WO-432012PCT     Fluid Flow                    Filed                 PCT/US06/003915                      Patent Cooperation Treaty

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a
WO-432012PROV    Fluid Flow                    Expired               60/649,560                            United States of America

                 An Electrostatic Fluid
                 Accelerator for and
                 Method of Controlling a       Application
WO-432012US      Fluid Flow                    Filed                 11/347,565                            United States of America

                 ELECTROSTATIC AIR             Application
WO-432014PCT     CLEANING DEVICE               Filed                 PCT/US05/14934                       Patent Cooperation Treaty

                 IONIC  LOUDSPEAKER AND        Application
WO-432018PROV    PATENT APPLICATION            Filed                 60/794,510                            United States of America

                 AN IONIC WIND LOUDSPEAKER
                 AND METHOD OF GENERATION
WO-432018US      SOUND                                                                                     United States of America

                 ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND A
                 METHOD OF CONTROLLING         Application
WO-432019CON     FLUID FLOW                    Filed                 11/437,828                            United States of America

                 FIREPLACE WITH
                 ELECTROSTATICALLY
                 ASSISTED HEAT TRANSFER
                 AND METHOD OF ASSISTING
                 HEAT TRANSFER IN
                 COMBUSTION POWERED            Application
WO-432021PROV    HEATING DEVICES               Filed                 60/862,760                            United States of America

                 RANGE HOOD WITH
                 ELECTROSTATICALLY
                 ASSISTED AIR FLOW AND         Application
WO-432022PROV    FILTERING                     Filed                 60/863,087                            United States of America

                 SPACE HEATER WITH
                 ELECTROSTATICALLY
                 ASSISTED HEAT TRANSFER
                 AND METHOD OF ASSISTING
                 HEAT TRANSFER IN HEATING      Application
WO-432023PROV    DEVICES                       Filed                 60/863,946                            United States of America

                 DESALINATION METHOD AND       Application
WO-432024PROV    DEVICE                        Filed                 60/864,591                            United States of America

                 METHOD OF AND APPARATUS
                 FOR CLEANING AND              Application
WO-432025PROV    DISINFECTION OF AIR           Filed                 60/865,130                            United States of America

                 AN ELECTROSTATIC FLUID
                 ACCELERATOR FOR AND
                 METHOD OF CONTROLLING A       Application
WO-432026PROV    FLUID FLOW                    Filed                 60/866,171                            United States of America

</TABLE>Kronos Advanced Technologies, Inc.
                          464 Common Street, Suite 301
                          Belmont, Massachusetts 02478

June 5, 2007

Daniel R. Dwight
Kronos Advanced Technologies, Inc.
464 Common Street, Suite 301
Belmont, Massachusetts 02478

Re:      Kronos Advanced Technologies, Inc. (the "Company")

Dear Mr. Dwight:

         This Agreement (the "Agreement") will confirm the understanding between
the Company and Daniel R. Dwight ("Optionholder") with respect to certain
matters described below.

     1.   The Company and Optionholder hereby acknowledge that the Company may
          be unable to meet its financial obligations and, as such, may have no
          alternative but to cease its operations unless it obtains long-term
          funding from one or more third parties.

     2.   Optionholder understands that AirWorks Funding LLLP and other
          individuals and entities (the "Lenders") are contemplating and
          negotiating a proposed financing with the Company (the "New
          Financing").

     3.   In connection with the Company obtaining the New Financing, the
          Lenders have requested that Optionholder agree to certain terms and
          conditions as set forth herein.

     4.   Optionholder hereby agrees that it shall not exercise, sell, assign,
          convey or otherwise transfer any rights of conversion it has with
          respect to any securities that are exercisable or convertible
          (directly or indirectly) into the common stock of the Company, par
          value $0.001 per share, or any other capital stock of the Company,
          including, without limitation, any options or warrants held by the
          Optionholder, until December 31, 2007. Exhibit A attached hereto sets
          forth all shares, options, warrants or other convertible securities of
          the Company held by the Optionholder on the date hereof.

     5.   Simultaneously with the execution of this Agreement, Optionholder
          shall execute and deliver to the Company the Voting Agreement attached
          hereto as Exhibit B.

     6.   Optionholder hereby acknowledges that it has received and had an
          opportunity to review the Funding Agreement of even date herewith by
          and among the Company and Lenders, the Secured Convertible Promissory
          Notes of even date herewith made by the Company in favor of Lenders,
          the Security Agreement of even date herewith by and among the Company,
          Kronos Air Technologies, Inc. and Lenders, and the Registration Rights
          Agreement of even date herewith by and among the Company and Lenders
          (collectively, the "Transaction Documents"). Optionholder hereby
          irrevocably and forever waives all claims, obligations, causes of
          action, costs (including attorneys' fees) and demands of every kind
          and nature, whether asserted or unasserted, known or unknown, both at
          law and in equity, which Optionholder may now have, have ever had or
          may hereafter have with respect to any "event of default,"
          anti-dilution right or protection, or any other right Optionholder may
          have under the securities held by Optionholder that arises as a result
          of, or is triggered by, the execution, delivery and performance of the
          Transaction Documents by the parties thereto.

     7.   This letter may be executed in any number of counterparts, each of
          which shall be deemed an original, and all of which shall constitute
          one and the same instrument. This letter shall be accepted, effective
          and binding, for all purposes, when the parties shall have signed and
          transmitted to each other, by telecopier, scanned file or otherwise,
          copies of this letter. The terms of this letter supersede the terms of
          any other verbal or written agreement between the parties with respect
          to the subject matter hereof existing prior to the date hereof. In the
          event of any litigation arising hereunder, the prevailing party or
          parties shall be entitled to recover its or their reasonable
          attorneys' fees and court costs from the other party or parties,
          including the costs of bringing such litigation including all appeals
          thereon and collecting upon any judgments. This letter shall be
          binding upon and shall inure to the benefit of the parties hereto and
          their respective heirs, executors, legal representatives, trustees,
          successors and assigns. Each Lender shall have the right and
          privilege, and is hereby authorized, in its own name and on its own
          behalf or on behalf of others for whose benefit this Agreement is
          made, to institute and prosecute any suit at law or in equity in any
          court having jurisdiction of the subject matter, to interpret and
          enforce this Agreement or any of its terms and provisions, including,
          but not limited to, suits for specific performance, mandamus,
          receivership and injunction. Except for the amounts expressly set
          forth herein, none of the parties hereto shall be liable to any other
          party for any amounts whatsoever. Optionholder has the right, power
          and capacity to execute and deliver this Agreement and to perform its
          obligations under this Agreement and to consummate the transactions
          contemplated hereby. The execution and delivery of this Agreement by
          Optionholder and the performance by Optionholder of its obligations
          hereunder and the consummation of the transactions provided for herein
          have been duly authorized and approved by all necessary action, if
          any, of Optionholder. This Agreement has been duly executed and
          delivered by Optionholder and constitutes the valid binding agreement
          of Optionholder, enforceable against Optionholder in accordance with
          its terms.

     8.   This Agreement shall be governed by and construed under the laws of
          the State of New York, without giving effect to principles of
          conflicts of laws thereof.

         If the foregoing accurately reflects our understanding regarding this
matter, please indicate your agreement and acceptance by signing in the space
provided below and returning an executed copy of this letter to us.

Sincerely yours,

KRONOS ADVANCED TECHNOLOGIES, INC.

By:    /s/ Daniel R. Dwight
       ---------------------
Name:  Daniel R. Dwight
Title: President and CEO

AGREED AND ACCEPTED:

/s/  Daniel Dwight
------------------
Daniel Dwight

cc:      Kirkpatrick & Lockhart Preston Gates Ellis LLP
         Attention:  Clayton Parker, Esq.

Attachment

<PAGE>

                                    Exhibit A

                            Optionholder's Securities

                                  See attached.

<PAGE>

                                    Exhibit B

                                Voting Agreement

                                  See attached.

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