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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)
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(A)
Applicable Range
Flat spans of rectangular or flat oval duct equal to or greater
than the round nominal opening
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Material
Thickness
(gauge)
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8
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22
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10
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22
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12
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22
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18
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22
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24
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22
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 |
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