Exhibit 10.20



                                August __, 1999



John T. Forbis, President
Kroy Building Products
P.O. Box 636
York, NE  68467


                    Re:  Incentive arrangements

Dear Mr. Forbis,

     This letter expresses our arrangement as follows:

    1.  Kroy Building Products, Inc. (the "Company") shall pay you a lump sum
cash bonus (less required withholdings) of $1,000,000 (the "Bonus") if you are
still employed as President and CEO of the Company (or at a higher position with
Nortek or any affiliated company) on the fourth anniversary of the date hereof.
The Bonus would also be paid to you immediately in the event you are terminated
as President of the Company (or such higher position) prior to that time, other
than for cause, or if you resign for good reason.  If you are terminated for
cause, or resign other than for good reason, prior to the fourth anniversary
hereof, the Bonus would not be paid.  As used herein, "cause" means (i) your
engaging in embezzlement, theft, or fraud or (ii) your conviction or pleading
guilty or nolo contendere to any felony.  As used herein, "good reason" means
(i) any assignment by the Company or Nortek to you of any material duties
inconsistent with your position or (ii) any material limitation placed by the
Company or Nortek on the normal powers associated with your position.

     2. You shall be recommended by Nortek management for a Nortek stock option
grant of 15,000 shares.  These shares shall vest at the rate of 5,000 shares per
year, commencing on the first anniversary of the date hereof.

     Please sign below to indicate your agreement.

                                     Very truly yours,


                                     KROY BUILDING PRODUCTS, INC.


                                     By:_______________________________
                                     Its:

Accepted and agreed.


_________________________
John T. Forbis