Reddit reviews Hon&Guan 4 inch Low Noise Flexible Ventilation Ducting - Insulated Aluminum Air Duct for Air Conditioner, Length 4 FT

【Premium Materiel】flexible ventilation ducting made of 1*PVC,2*aluminum foil,1*centrifugally glass-wool and steel wire helix to preserve the shape.【Reduce Noise】Hon&Guan Noise Reducer Silencer is designed for reducing nosie from fans and carbon filter systems, can decrease the noise by up to 50%.【Thermal Insulation】with a good thermal insulation performance, works well with your portable ac device, temperature endurance range from -22°F ~ 302 °F (-30℃ ~ 150℃).【Anti-corrosion and Durable】thick layer of PVC&2 layers of Aluminum on this ducting prevents gas leaks. Works with extractor and inline duct fans, carbon filters which are 4" in diameter.【Variety of Applications】Hon&Guan Duct Silencer is suitable for HVAC system. It will move and deliver air in Kitchens (cooking exhaust), Green Houses and Grow Rooms (Air Circulation, Intake, Exhaust and Light Fixture Cooling), Bathrooms (Smell and Moisture Exhaust), Dryer Rooms, Grow Tents and other applications etc.