On 1/6/2013 5:37 PM, Mark P Williams wrote:
Hi,

First time poster...

I'm fairly new to the US forced air furnace system, but my question is
something that I haven't gotten an answer to on google... so here I am.

My furnace appears to be functioning normally, no strange sound except
when it finishes and the thermostat clicks off... when the airflow stops
there is a horrid squeak, followed by another squeak and then a third...
this has been happening for quite sometime, with this being the third
winter in the house in the north east but to my ear it is getting
longer.

If this is normal and is just the sound of a vent closing, that would be
awesome but I'd like to check!

also the thermostat clicks off and the furnace takes a minute to shut
off... it is a high efficiency furnace installed in 02.

Much appreciation to anyone out there who has a clue to what this could
be.

Thanks,

Mark.




lube the flappers in the bathroom and kitchen vents.
BUT
if the flappers are being blown open by the furnace,
you've got a lot of wasted heat that needs to be tracked
down and fixed...like a leak in the suction side of the furnace.