Best Duct Damper

AC Infinity 6\ Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 6” Ducting in Range Hoods and Bathrooms Fans

An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications..
Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts..
Mounts horizontally or vertically to prevent backflow and debris from entering ducting..
Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow..
Fit for 6 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat.

An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications..
Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts..
Mounts horizontally or vertically to prevent backflow and debris from entering ducting..
Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow..
Fit for 4 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat.

An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications..
Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts..
Mounts horizontally or vertically to prevent backflow and debris from entering ducting..
Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow..
Fit for 8 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat.

The Listed size 14"x 6" is for inside duct opening measurement(the duct hole), actual outside dimension is 15.75" X 8".
All plastic construction with 1/2" fin spacing for high air flow with rust proof feature perfect for areas with high moisture.
Three way air deflection design with bright white face and black damper in the back.
Multi-shutter damper with easy handle to adjust desired amount of air flow.
Two screw holes on each side with two screws included.

Exhaust duct designed with butterfly damper for maximum airflow and energy conservation.

The Listed size 12"x 8" is for inside duct opening measurement (the duct hole) , actual outside dimension is 13.75" X 9.75".
Stamped Face Steel Construction with 1/2" fin spacing for high air flow.
Multi-shutter damper with easy handle to adjust desired amount of air flow.
Individually shrink wrapped with card board pad in the back for extra protection.

Professional Series, 4" Wide Mouth Cap With 4" Diameter Aluminum Pipe.
Snug fit back draft damper helps prevent cold air, snow or rain from entering the home.
Damper has been designed for superior noise reduction.
Removable pest screen that helps to keep pests out and allows for easy cleaning of the duct.
Snap on pipe to cap assembly that eliminates the need for lint trapping staples.
UV resistant coating to prevent the cap from discoloring.

Back draft damper is made for insertion into inch ventilation ducts. The backflow damper RKI opens and closes automatically. It has a strong spring and can be installed either horizontally or vertically. The flap is suitable for retrofitting, since it is completely inside the duct.
Damper has 2 valves, designed for use in air conditioners (AC), dryers, exhaust, extractor or range hoods, heating ducts, vents and other HVAC applications.
INSTALLATION: The backflow flap is installed by inserting it into the ventilation pipe until it stops. The position of the spring should be horizontal for horizontal installations so that it can open and close optimally. The Backdraft shutter is installed so that the damper blades open only in the outflowing air direction..
The backflow flap opens and closes automatically at low air volumes. It has a smooth-running spring and an internal foam strip to keep the blades from rattling and can be installed horizontally or vertically.
Back draught valves can be inserted into ventilation ducts which are flexible or non flexible. Cannot be used with plastic ....