Complies fully with relevant Building Regulations and British Standards.
Performance
Provides the equivalent of a continuous 10mm opening when fixed at 600mm centres (10,000mm2 per metre run).
Installation
Exterior face of vent is offered up to soffit board to mark centres for the two holes.
Overlapping holes are made using a Klober 70mm Holesaw or similar.
Alternatively, a rectangular hole 120mm x 70mm can be cut and the soffit vent then inserted. Vents should be evenly spaced to avoid stagnant air pockets. Full instructions provided with each pack.