butterfly damper


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butterfly damper

[′bəd·ər‚flī ‚dam·pər]
(engineering)
butterfly valve

butterfly valve

butterfly valve
A valve used to control the flow of fluids; a disk controls flow through the port. Also called a butterfly damper.
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The 78% SSE boilers have Electric Butterfly dampers within the first vent connector segment - These boilers are commonly fitted with vent dampers and Electric Butterfly dampers are used over other types due to their fast vent restriction, leading to cooler off-cycle flows, and resulting in conservative condensation estimates.
Simulation and experimental investigation of condensation in residential venting

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