Efficient and durable primary roof ventilator supplied in convenient 1m lengths.

An over fascia vent is used when the fascia board is fitted in the ends of the rafters, creating a situation where ventilation can only be positioned over the top of the board.

OF1 provides ventilation equivalent to a continuous 10mm opening (10,000mm²) and is used to ventilate pitched roofs of >15° and the roof void is uninhabited loft or attic space.

OF2 provides ventilation equivalent to a continuous 25mm opening (25,000mm²) and is used to ventilate pitched roofs of <15°, flat roofs or any roof where living accommodation is contained within the roof space.

Uses:

For roof eaves ventilation
For flat roof abutment ventilation
On roofs where the eaves incorporate a fascia board
On roofs which do not incorporate a soffit board, or where an unbroken soffit board is required