Literature on the In-Forcerâ„¢ fresh or combustion air intake systems is available. The systems improve poor IAQ associated with tightly constructed homes and buildings, says the company. Fresh air models operate based on a user-programmable time. Combustion air models interlock with heating equipment. The literature contains installation steps, unit dimensions, and motor specifications. Charts include one containing information on the required cfm based on type of equipment and Btuh input, as well as one detailing the unit's cfm performance.

Tjernlund Products, Inc., 1601 Ninth St., White Bear Lake, MN 55110-6794; 651-426-2993 or 800-255-4208; 651-426-9547 (fax); www.tjernlund.com.

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