Fantech 12" Back-Draft Damper for Circular Duct, Single

Backdraft Dampers are non-flanged horizontal mount exhaust backdraft damper. The frame is galvanized steel with aluminum blades. The blades have a felt seal on the leading edge for quiet closing and better protection from the weather. Spring assisted to allow the blades to open quickly. Ideal for use in roof curbs, ductwork, or wall collars when using a fan or power roof ventilator. Recommended for horizontal mount exhaust applications. MADE IN THE USA

Backdraft Dampers are non-flanged horizontal mount exhaust backdraft damper. The frame is galvanized steel with aluminum blades. The blades have a felt seal on the leading edge for quiet closing and better protection from the weather. Spring assisted to allow the blades to open quickly. Ideal for use in roof curbs, ductwork, or wall collars when using a fan or power roof ventilator. Recommended for horizontal mount exhaust applications. MADE IN THE USA

Shut-off damper ADC is a 2-position, motorized damper without end switch. The damper is powered open with 24V AC, and is normally closed with spring return. Power supply wiring is connected to the lead wires attached to the damper motor. Positive closure is provided by a tight seal.

Heavy duty motorized volume control dampers. The 1-1/2" flanged frame has welded corners for added strength. The 6" wide blades are center-pivoted for a full 90 degree rotation with parallel blade action. The stainless steel jamb seals help in keeping out light, air, and moisture. The dampers can be used for exhaust or supply applications and can be mounted in either a vertical or horizontal position; typically walls or curbs. Comes standard with an internally mounted factory installed 100-240 volt power open / spring close motor with end switches. MADE IN THE USA

The IR is an iris damper for measuring and adjusting the air flow. The IR has the following specifications: low noise level, centrically-formed air flow and fixed test points for precise measurements. The damper also has an adjustment aperture which can be opened completely, which means there is no need for an access door for cleaning. Available in sizes 4-25 inches.