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QUESTION:So I was gonna replace my gas furnace filter today before the cold weather
starts, or at least the cold night weather. But for the life of me I can't
find any information on or about my gas furnace - except for the brand and
the date of installation. Heck, even the filter is one of those freeform
washable filters that doesn't have a cardboard border with the dimensions on
it (basically just a rectangular mat of green fibers that is totally
impregnated with dust and looks about a useful as a third tit). So I took
it out and measured it - it comes out to be 14x27
So I go out looking for a filter for it and no one I know of sells anything
even remotely like that size, 14x30 14x24 14x25 but not 14x27.
So anyway I have a Payne furnace installed in 1983, there is a wiring
diagram on the inside of the filter cover and that give a model number of
397H or 375A but that's it. There's nothing on the outside of the furnace
and nothing that I could see on the inside where the motor and burners sit.
So what's the story, the Payne homepage is about a useful as a 4th tit and I
couldn't pull anything up about a 375 or 397.
ANSWER: I'm no expert. But we had the same problem. My local hardware store
sells the big fiber mat, though, so we just bought that and cut our own
filter. We get about two filters out of the mat.
BUT, and I don't know if it makes any difference, there are a lot of
loose fibers after you handle and cut that green stuff, so we always
run the vacuum hose over it a couple of times before installing.
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