GRAVITY SHUTTER

A horizontal operable shutter wh ich operates to
equalize the pressure across it.
• The frame and blades are extruded aluminium alloy
and are polyester powder coated with a white finish.
• The frame has a typical wall thickness of 1 /16″ and is
separated from the movable blades by an extruded
rigid PVC track, which is riveted to and becomes an
integral part of the frame.
• A 1 /8″ thick, 3/8″ wide foam tape is installed on the
blades where they overlap to insure a good seal and
to reduce noise.
• Each shutter is carefully designed to equalize the
pressure in such areas as a compressor or fan room
with the outside.

• The blades are designed and positioned in such a way
that if the pressure in the room increase the blades
automatically lift and open relieving the pressure in
the room.
• When the room pressure is normalized the blades drop
to the closed position by gravity.
• These devices are also employed at the end of the
ex haust ducts where they would open when the
exhaust fan was turned on and would close when the
fan was turned off.
• Standard finish white for frame and blades. Painted
under electrostatic polyester powder coated system.
Other colors avai lable on request. The polyester
powder on highest quality are used to enhance the
appearance of the units.