First4Spares Stainless Steel Cowled External Extractor Wall Vent Outlet With Cushioned Non Return Flap 100Mm 4" First4spares stainless steel cowled external extractor wall vent outlet with cushioned non return flap (100mm, 4") Stainless steel square hooded wall vent with non return, cushioned low noise flap, screw fixings, retainer clips and seal. Specifications: 100mm (4") diameter - circular pipe / hose fitting, overall outer measurements: 150mm x 150mm (6" sq), stainless steel This stylish steel wall extractor hooded vent outlet has an unobtrusive profile, a cushioned low noise flap and a weather seal to prevent unwanted leaks and drafts. Ideal for all tumble dryer vent pipes / hoses, bathroom vents & extractors, air conditioning units, kitchen fans & vents, all home wall vents, heat transfer and ventilation systems, gas & electric dryers, cooker hood extractors, as well as a wide variety of industrial uses.