Document:

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

June 5, 2007

J. Alex Chriss
Kronos Advanced Technologies, Inc.
464 Common Street, Suite 301
Belmont, Massachusetts 02478

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

Dear Mr. Chriss:

         This Agreement (the "Agreement") will confirm the understanding between
the Company and J. Alex Chriss ("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.   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.

<PAGE>

     6.   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.

     7.   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/ J. Alex Chriss
---------------------
J. Alex Chriss

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

Attachment

<PAGE>

                                    Exhibit A

                            Optionholder's Securities

                                  See attached.Kronos Advanced Technologies, Inc.
                          464 Common Street, Suite 301
                          Belmont, Massachusetts 02478

June 5, 2007

Dr. Igor Krichtafovitch
Kronos Advanced Technologies, Inc.
464 Common Street, Suite 301
Belmont, Massachusetts 02478

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

Dear Dr. Krichtafovitch:

         This Agreement (the "Agreement") will confirm the understanding between
the Company and Igor Krichtafovitch ("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.

<PAGE>

     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/  Igor Krichtafovitch
-------------------------
Dr. Igor Krichtafovitch

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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