The new Iris Damper permits airflow to be adjusted and measured at one location, resulting in reduced field time and improved accuracy in air balancing, says the company. The damper uses interlocking steel plates and a calibrated control lever to form an adjustable aperture. By measuring differential pressure across the aperture ports, and referring to the matching performance curve, airflow can be precisely determined, the company says. Ten sizes are available, from 4 through 32 in., with capacities from 15,000 to 25,000 cfm.
Continental Fan Manufacturing Inc., 203 Eggert Rd., Buffalo, NY 14215; 800-779-4021; 716-842-0611 (fax); www.continentalfan.com (website).