ClimaChem, Inc. 16 South Pennsylvania Oklahoma City, OK 73107 405-235-4546 Fax: 405-236-1209 March 3, 2003 Todd L. Boehly, Managing Director Guggenheim Partners 135 East 57th Street, 9th Floor New York, New York 10022

ClimaChem, Inc.
00 Xxxxx Xxxxxxxxxxxx  Xxxxxxxx Xxxx, XX 00000  000-000-0000  Fax: 000-000-0000

March 3, 2003

Xxxx X. Xxxxxx, Managing Director
Guggenheim Partners
000 Xxxx 00^xx Xxxxxx, 0^xx Xxxxx
Xxx Xxxx, Xxx Xxxx 00000

RE: Securities Purchase Agreement (the "SPA"), dated as of May 24, 2002, as amended, by and among ClimaChem, Inc. ("ClimaChem"), certain subsidiaries of ClimaChem, LSB Industries, Inc., as guarantor, the Purchasers identified therein and Guggenheim Investment Management, LLC, as Collateral Agent 9;

Dear Xxxx:

This letter shall serve to document the consent by Guggenheim Investment Management, LLC, as collateral agent and the Purchasers that are party to the SPA, to the increase in Capital Expenditures, as defined under the SPA, to $11,240,000 for the 12-month period ending each fiscal quarter after the date of the SPA. Please confirm your consent to the foregoing by signing below where indicated. Thank you.

                                                                        Sincerely,


                                                                        Xxxxx X. Xxxxx
                                                                        General Counsel


AGREED TO AND ACKNOWLEDGED:

_____________________________________
Xxxx X. Xxxxxx, Managing Director for
the Purchasers and Collateral Agent