| 摘要 |
Apparatus for sealing a duct comprises an enclosed body having inlet and outlet passages communicating with the duct. A duct sealing member is located within the enclosed body and is movable between an open position to permit flow through the enclosed body and a closed position to block one of the passages of the enclosed body to prevent flow through the body. An actuating system is provided for moving the duct sealing member from the open position to the closed position. A sensing system for detecting a pre-determined condition such as excessive heat is provided to activate the actuating system and seal the duct. Also disclosed is a ducting system that incorporates the sealing apparatus and permits ventilation of heating appliances in apartment dwellings and the like in a significantly reduced area leading to material cost savings.
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