Pressure relief flaps are designed to let air pass in one direction or to relieve pressure within a space. These flaps are not designed to maintain a set pressure within a space.
Code 0276. Pressure relief flap with a flange on one side and airflow from the flange side.
Code 0277. Pressure relief flap with a flange on one side and the airflow from the side without a flange.
Code 0278. Pressure relief flap with a flange on both sides for bolting to ductwork connections.
50 mm increments on the length and height from 200mm to 1000mm in one piece.
Aluminium with nylon bearings and nylon brush
Mill finish aluminium only.
Flanges are supplied un-drilled. See page 4 for fixing alternatives.
Each unit is wrapped in corrugated cardboard and banded with hardboard protection to the faces
NON STANDARD SIZES
We can manufacture almost any nominal or overall size. Units over 1000mm x 1000mm can be made up by bolting single units together. Please contact Head Office for details. The first digit of the product code becomes 9 instead of 0.
• The code for the basic product should have 13 digits.
See page 1.
• Please always give length first and then the height.
A pressure relief flap for surface mounting on an
outside wall for exhaust air i.e. with the airflow from
the side without a flange, 500mm x 500mm square
would be coded 0277/00500/0500.