First4Spares Stainless Steel Square External Extractor Wall Vent Outlet With Gravity Flaps 100Mm 4" First4spares stainless steel square external extractor wall vent outlet with gravity flaps (100mm, 4") Brand new stainless steel square wall vent with anti-draft gravity flaps, screw fixings, retainer clips and seal. Specifications: 100mm (4") diameter - circular pipe / hose fitting, overall outer measurements: 150mm x 150mm (6"), stainless steel This stylish steel wall extractor vent outlet has an unobtrusive profile, 4 gravity flaps and a weather seal to prevent unwanted leaks and drafts. Ideal for all tumble dryer vent pipes, 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.