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



June 12, 2007

Richard A. Sun
_______________________
_______________________

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

Dear Mr. Sun:

         This Agreement (the "Agreement") will confirm the understanding between
the Company and Richard A. Sun ("Optionholder") with respect to certain matters
described below.

     1.   Optionholder hereby acknowledges that it is in the best interest of
          the Company to obtain 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, except as may be required by
          separation or divorce agreements. 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 directly as
          a result of, or is triggered by, the execution, delivery and
          performance of the Transaction Documents by the parties thereto. This
          letter agreement is not intended to modify or reduce any economic
          rights of Optionholder.



Richard A. Sun
June 12, 2007
Page 2 of 3

     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 or under that certain
          convertible promissory note dated as of April 27, 207 made by the
          Company in favor of Optionholder (the "Note") or under a related
          security interest, 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. Each party 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 each party and the performance by each party 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 such party. This Agreement has been duly
          executed and delivered by each party and constitutes the valid binding
          agreement of each party, enforceable against such party 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.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



Richard A. Sun
June 12, 2007
Page 3 of 3

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


AGREED AND ACCEPTED:


/s/ Richard A. Sun
- --------------------
Richard A. Sun




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

Attachment



                                    Exhibit A

                            Optionholder's Securities

                                  See attached.