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TurnThePage's avatar
TurnThePage
Explorer
Apr 06, 2019

How do I block a furnace outlet at the manifold?

My furnace pumps the hot air from a manifold with three exits into hoses which then enter into another manifold that disappears under the floor. There is some blockage down there that is not easily a...
enblethen's avatar
enblethen
Nomad
Apr 06, 2019
It is called a plenum, not a manifold!
I would not plug anything off because it cause the furnace to over heat.
Odds are the duct has collapsed. Yes, it can be difficult to gain access.
Make and model of furnace would or may help. The installation manual may show how toremove furnace to get to the duct through that access.

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