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Pressure-Relief
Access Doors
Our
pressure-relief access door (for positive pressure systems) provides both
convenient access and protection against duct collapse, which can occur
downstream when a fire damper closes. During nominal operation, the cover
is held in place against a sealing gasket by special latches. To gain
access, simply open the latches and remove the door by its handle. If
a closed damper causes substantial negative pressure immediately downstream
at the access door location, the cover of the access door automatically
opens inward to relieve pressure and prevent collapse. A retaining chain
prevents the cover from being pulled into the ductwork.
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Available
Sizes—Standard Round Relief Access Doors
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Nominal
Opening
(inches) |
(A) Applicable Range
Flat spans of rectangular or flat oval duct equal to or greater than the round nominal opening |
Material
Thickness
(gauge) |
8 |
|
22 |
10 |
|
22 |
12 |
|
22 |
18 |
|
22 |
24 |
|
22
|
|
 |
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