Filter Curbs for rooftop equipment are manufactured to precise specifications, utilizing advanced laser technology, which offers the tightest tolerances and superior construction at a competitive price. Options include a built-in pitch, extra height for installation of sound traps beneath the unit, and a pressure-treated wood nailer. Delivery is usually in two weeks. Thybar Corporation, 913 S. Kay Ave., Addison, IL 60101; 800/666-CURB; fax 630/543-5309; www.thybar.com; email to [email protected].— Thybar Corporation