The Iris damper permits airflow to be adjusted and measured at one location, resulting in reduced field time and improved accuracy in air balancing. It uses interlocking steel plates and a calibrated control lever to form an adjustable aperture. By measuring differential pressure across the pressure ports, and referring to the matching performance curve, airflow can be precisely determined. Ten sizes are available, from 4-32 inches, with capacities to 20,000 cfm. The damper is manufactured of galvanized steel, and fitted with a neoprene gasket for airtight mounting. Stainless steel, motorized, and positive seal versions are available. According to the manufacturer, the damper is accurate to ±5 percent and retracts fully for duct cleaning.

Continental Fan Manufacturing Inc., 203 Eggert Rd., Buffalo, NY 14215; 800-779-4021; 716-842-0611 (fax);;

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