4'' Inch Duct Connector Flange with Backdraft Damper Plastic Straight Pipe for Heating Cooling Ventilation System (100 mm Valve)

SIZE & COMPATIBILITY – Neck insertion diameter: 3.9 inch / 99mm, Wall plate dimensions: 5.91 x 5.91 inch / 150 x 150mm, Screw hole spacing: 5.31 inch x 5.31 inch / 135 x 135mm. BUILT TO LAST IN ANY ENVIRONMENT – Crafted from rigid ABS plastic with integrated backdraft damper for reliable airflow control. Temperature resistant from -5°C / 23°F up to +60°C / 140°F, engineered for long-lasting indoor and outdoor use. ADVANCED AIRFLOW CONTROL – Built-in backdraft damper automatically prevents cold drafts, odors, and unwanted airflow from entering, while maintaining smooth ventilation efficiency in heating, cooling, and exhaust systems. EFFORTLESS DIY INSTALLATION– Mount easily installation with pre-drilled screw holes for secure wall or ceiling mounting. Can be assembled without adhesives or sealants, making it easy to connect ducting pipes and ideal for both homeowners and professionals. OPTIMIZED FOR HVAC PERFORMANCE – Perfect for HVAC exhaust, kitchen vents, dryer ducts, and air conditioning systems. Helps reduce energy waste, improve indoor air quality, and maintain consistent airflow in residential and commercial projects.