PROMISSORY NOTE (EQUIPMENT LOAN)

(EQUIPMENT LOAN)

$765,000.00Charleston, West Virginia

April 7, 2022

FOR VALUE RECEIVED, the undersigned KRONOS ADVANCED TECHNOLOGIES, INC., a Nevada corporation (“KAT”) and KRONOS ADVANCED TECHNOLOGIES WV, INC., a West Virginia corporation (KATWV and together with XXX, xxx “Borrowers”), hereby promise to pay to the order of WEST VIRGINIA ECONOMIC DEVELOPMENT AUTHORITY, the sum of Seven Hundred Sixty Five Thousand and 00/100 Dollars ($765,000.00) over a term of one hundred twenty (120) months, with interest from the date hereof at the rate of two and seventy five one hundredths percent (2.75%) per annum on the unpaid principal, in lawful money of the United States, at office of the WVEDA, NorthGate Business Park, 000 Xxxxxxxxxxx Xxxxx, Xxxxxxxxxx Xxxx Xxxxxxxx, 00000-0000, or at such other location as may be subsequently designated by holder hereof, as follows:

1.This Promissory Note shall have a term of ten (10) years, and shall be due and payable in one hundred nineteen (119) equal monthly installments of Seven Thousand Two Hundred Ninety-Nine and 85/100 Dollars ($7,299.85) each, beginning on the 7^th day of May, 2022, and continuing on the 7^th day of each calendar month thereafter, with the one hundred and twentieth (120^th) and final installment, which shall be due on or before April 7, 2032, at which time the entire unpaid principal balance, together with the interest accrued thereon at the rate aforesaid, shall be due and payable in full. Said payments shall be applied first to the payment of said interest on the unpaid balance, second to the payment of principal, and third to the payment of late charges and all other amounts due under this Promissory Note.

2.Borrowers shall remit their monthly payments due to WVEDA under this Promissory Note through Automated Clearing House (ACH) transfer.

3.This Promissory Note is described in and entitled to the benefit and security of a Loan Agreement dated as of the date hereof by and among WVEDA and the Borrowers (together with all amendments, renewals, extensions, substitutions and modifications thereof, the “Loan Agreement”), a Security Agreement dated as of the date hereof by and between KATWV and WVEDA (together with all amendments, renewals, extensions, substitutions and modifications thereof, the “Security Agreement”), and a Credit Line Deed of Trust and Fixture Filing dated as of April 7, 2022, made by KATWV to Xxxxx X. Xxxx, as Trustee, for the benefit of WVEDA (together with all amendments, renewals, extensions, substitutions and modifications thereof, the “Deed of Trust”). If any default shall be made in the payment of any installments of this Promissory Note or any part thereof, when due, and if such default shall continue for a period of thirty (30) days after written notice to Borrowers, or if there shall be a breach at any time of a covenant, condition, provision, warranty, stipulation or agreement contained in said Loan Agreement, Security Agreement or Deed of Trust, after requisite notice, if any, is given to Borrowers as provided therein, then the entire unpaid principal balance hereof, with interest accrued thereon, shall at once be and become due, payable and demandable, without any further notice, at the option of the holder hereof. Failure at any time on the part of the holder hereof to exercise such option shall not constitute a waiver of the right to exercise the same in the event of a subsequent similar default.

4.Borrowers shall have the right at any time, without notice, premium or penalty, to pay all or any part of this Promissory Note, but any such partial payment shall not

operate to postpone payment as and when due of the regular installments due on this Promissory Note.

5.Borrowers and each endorser hereof expressly waives presentment for and demand of payment and notice of the nonpayment of any installment of principal or interest falling due under this Promissory Note, and also waives protest of same upon default in the payment of such installment, and agrees that extension or extensions of the time of payment of this Promissory Note, or any installment part thereof, may be made before, at or after maturity by agreement with any one or more of the parties hereto without notice to and without releasing the liability of any other party.

6.Any payment due under this Promissory Note not made within ten (10) days of its due date may be subject to a late charge equal to five percent (5%) of the monthly payment due. An additional five percent (5%) may be charged for each successive month the payment remains past due. This late payment charge shall apply individually to all payments due and there shall be no daily pro-rata adjustment. All late charges are in addition to, not in lieu of, the continuing accrual of interest.

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IN WITNESS WHEREOF, the Borrowers have caused this Promissory Note to be executed by their duly authorized officers on the date first above written.

KRONOS ADVANCED TECHNOLOGIES,

INC.,

a Nevada corporation

By:___________________________________

Name: Xxxxxx X. Xxxxxxxx

Its: Chief Operating Officer

KRONOS ADVANCED TECHNOLOGIES, WV

INC.,

a West Virginia corporation

By:___________________________________

Name: Xxxxxx X. Xxxxxxxx

Its: Chief Operating Officer