Air Duct (4" Inch)

Four inch ventilation ducting composed of three layers; thick black PVC atop two layers of heavy-duty aluminum with a layer of PET and steel wire helix to preserve its shape. The aluminum interior is designed for high humidity output and will not rust or mold. Our ducting is extremely flexible and easy to install and will easily slide onto your intake or exhaust fan. This ducting will also reduce fan noise by up to 50%. Compatible with our 4 inch inline fans, 4 inch duct clamps, mushroom greenhouses and mushroom grow tents.