Are valves needed before and after the exhaust fan?

2018-10-10View Original

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Are valves needed before and after the exhaust fan? Should we still use the built-in damper to control the flow rate?

Reply #22018-10-12

It seems there’s a valve or some kind of control valve ahead; I don’t see any air passages leading into the furnace. It appears that certain components require support or heating elements, and oxygen needs to be supplied from below

Reply #32018-10-15

If the outlets of multiple exhaust fans are combined into one main pipe, is it necessary to install a check valve?

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Are valves needed before and after the exhaust fan?

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