Heat-responsive duct closing method and apparatus
First Claim
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1. The method of closing a heating and ventilating duct upon the occurrence of fire to prevent the flow of a gas through the duct, which comprises the steps of:
- a. arranging within the duct an impervious inflatable bag in the collapsed condition;
b. connecting the bag with normally de-activated bag inflating means; and
c. activating said bag inflating means when the temperature of the fluid in said duct exceeds a given value to expand said bag to an expanded condition in sealed engagement with the entire inner circumference of a portion of the duct, thereby to prevent the flow of fluid through the duct.
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Abstract
A method and apparatus are disclosed for controlling the passage of air, smoke and noxious fumes through the heating and ventilating ducts of a building by means of a normally-collapsed, leak-proof bag which expands upon activation by smoke detection means to completely seal the duct from the passage of air and smoke.
32 Citations
14 Claims
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1. The method of closing a heating and ventilating duct upon the occurrence of fire to prevent the flow of a gas through the duct, which comprises the steps of:
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a. arranging within the duct an impervious inflatable bag in the collapsed condition; b. connecting the bag with normally de-activated bag inflating means; and c. activating said bag inflating means when the temperature of the fluid in said duct exceeds a given value to expand said bag to an expanded condition in sealed engagement with the entire inner circumference of a portion of the duct, thereby to prevent the flow of fluid through the duct.
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2. Apparatus for sealing a duct of a building upon the occurrence of a fire, comprising
a. an inflatable impervious bag adapted for mounting in the collapsed condition within the duct; -
b. normally de-activated bag inflating means connected with said bag; and c. heat-responsive activating means for activating said bag inflating means to expand said bag to an expanded condition in sealed engagement with the entire inner circumference of a portion of the duct, thereby to prevent the flow of fluid through the duct. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification