The company's Iris damper features interlocking steel plates and a calibrated control lever to form an adjustable aperture. Ten sizes are available, from 4 to 32 in., with capacities to 20,000 cfm. The unit is manufactured of galvanized steel, and fitted with a neoprene gasket for airtight mounting. Stainless steel, motor-ized, and positive seal versions are available.

- Continental Fan Mfg.
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