Package: Include 2 pack backdraft damper duct , diameter 4 inch, height 3.5 inch, thickness 0.02 inch. Fit for 4 in duct openings. Please confirm the size before purchase
High Quality Material: The housing of SOUJOY Duct damper is galvanized steel, the inner rubber gaskets that create an airtight seal and grip between the damper and ducts
Easy to Install: Just simply push the insert backflow preventer into the ventilation pipe as far as possible. The position of the spring should be horizontal so that it can be opened and closed optimally. Suits both horizontal and vertical installations
Practical Function: The airflow regulating backdraft shutter opens only in the outgoing air direction, prevents cold air or wind from entering the ventilation duct. Backdraft damper can ventilate an area to avoid toxic fumes from building up
Widely Use: The draft blocker is perfect for dryer vent, AC, exhaust, extractor or range hoods, heating systems, fans, vents and other residential, commercial and industrial HVAC applications
