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Ubbink OFT4 Flat Roof Vent Terminal (Twin Wall) - 110mm Diameter

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£45.85 Incl. VAT
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Suitable for a Asphalt roof covering, Ubbink’s OFT/4 flat roof vent/terminal can be used in soil and vent systems, and for natural (passive) or mechanical ventilation installations.The OFT/4 has a special low air resistance cowl - the pressure/airflow resistance is <1.0 Pascal at 225m3/h. The pipework above the roofline is twin walled and incorporates an integral condensation drain. The stack pipe has an integral collar and separate aluminium flange for use with both felt and asphalt.

The Ubbink OFT/4 range is available in five different flange types for different roof coverings, Asphalt, 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 Asphalt roof covering
  • Easy removal for servicing purposes
  • Large free vent area
  • Low Pa resistance

Product Specifications

Material: Polyethylene/Aluminium

Weight: 1.78kg

Diameter: 110mm

Height Above Roof: 300mm

Flange Diameter: 395mm

Depth Below Roof: 350mm

Free Vent Area: 8400mm2

Pressure/Airflow Resistance: 1.0Pa


Length 1mm Thickness 1mm Width 1mm


Diameter 110mm Material Asphalt


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Questions & Answers


Hi Would this be suitable to connect to a 100mm bathroom extract fan? going through a flat roof? And how would I fix it to the roof to ensure water tightness?


This would be suitable for 100mm, you need to dress the roof covering over the flange to ensure a tight seal but the roofer completing the work can normally assist with this.

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Ubbink OFT4 Flat Roof Vent Terminal (Twin Wall) - 110mm Diameter

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