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Circular Flap Dampers
Pressure Relief Flaps
Equalising Grids
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PRESSURE RELIEF FLAP
PRESSURE RELIEF FLAPS (PRF) permit the flow of air in one direction only. The gravity controlled hinged flaps open at very low pressure differences. The opening pressure difference can be adjusted by the addition of weights to the flaps. PRF's are normally used in walls or partitions to exhaust air. They are not suitable for use in doors or in duct systems as back draught shutters. They are not air tight.
PRF flaps are light gauge aluminium hinged on duraluminium rods, turning in nylon bearings. The frame is made of aluminium extrusion with mitred joints. The frame is stove enamelled silver 'Analum', but the flaps are natural aluminium.		 damp03.jpg (12484 bytes)
PRF PRF/RF
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Outside Fixing Inside Fixing Outside Fixing Inside Fixing

Dimensions

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The units are manufactured in increments of 75mm up to 625mm x 1825mm high.
Larger units can be supplied in sections.
Fixing Method

Screw fixing through flange (Standard).

Pressure Relief Flap (PRF) Performance Data