Suitable for a felt roof covering, Ubbink’s OFT/1 flat roof vent/terminal can be used in soil and vent systems, and for natural (passive) or mechanical ventilation installations. The Ubbink OFT/1 range provides a large free vent area whilst have a low Pascal resistance figure. The Ubbink OFT/1 range is available in five different flange types for different roof coverings, Asphalt, Felt, EPDM, Bitumen and PVC, to allow termination through a flat roof to ducting up to 166mm. The stack cap is fixed mechanically so that it is more secure when installed in extreme weathers, however this can be removed for servicing purposes. Features & Benefits Suitable for felt roof covering Easy removal for servicing purposes Product Specifications Material: Polyethylene Weight: 1.72kg Diameter: 110mm Height Above Roof: 220mm Flange Diameter: 330mm Depth Below Roof: 600mm Free Vent Area: 8400mm2 Pressure/Airflow Resistance: 5.9Pa