Features: Practical design: Bathrooms backdraft damper has a smooth-running spring and an internal foam strip to keep the blades from rattling. The backflow flap opens and closes automatically at low air volumes. Easy to install: The backflow flap is installed by inserting it into the ventilation tube until it stops. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally.and can be installed horizontally or vertically. Specifications: Quantity: 8 pieces Material: galvanized steel, aluminum, stainless steel Color: as show as picture Mold size: backdraft damper: 3.46 x 3.9 inch Package contents: 2 x Backdraft damper 6 x Duct clamps Warm Notice: Please consult and pay attention to product size before buying. Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens.
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