Thybar Corp. has introduced its new filter curb for additional filter capacity at a rooftop unit. Each curb is manufactured to precise specifications and most are shipped fully assembled. Advanced laser technology offers the tightest tolerances and superior construction at a competitive price, said company representatives. Each one is custom manufactured. Delivery is usually within two weeks after receipt of the order. The curbs feature all-welded construction, factory-insulated walls, integral filter racks and access doors. Options include a built-in roof pitch, extra height for installation of sound traps beneath the unit, and a pressure-treated wood nailer.

Thybar Corp., 913 S. Kay Ave., Addison, IL 60101; (800) 666-CURB; fax (630) 543-5309;