... .5mm), SS201(0.34mm) 3. errosion resistance Stainless Steel Vent Cap for HVAC systems 1. Apply for ventilationWith mesh proof inserts ... Use for exteral walls as a vent hoop 2. Size 100mm,150mm,200mm,250mm,300mm 3. ... spiro air duct, vent duct, ship duct, elbow, connector, flanger, reducer, damper, tee, and many other ventilation accessories. Stainless Steel Vent Cap for ...