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Furnace filter conventions
QUESTION:When looking at my home furnace I'm struck by just how little is on it.
Aside from the manufacturer (Payne) and a certificate indicating when it was
installed (April 1983) there's absolutely nothing on it - no model number,
no filter sizing, no anything that would be of value to a new homeowner.
First, on the inside of the filter cover there are wiring and mechanical
schematics indicating possible model numbers but nothing conclusive. In my
case I spotted 375A and 397H but nothing to tie it with a model number.
Only my experience with engineering drawings let me to think that was the
model numbers appropriate to the schematic.
So I'm trying to replace the filter, the current one that was sold with the
house is this green mat of plastic fibers and is totally impregnated with
dust. Unfortunately it has only rough dimensions and works out to be 14x27"
So I played around with different cheap frame filters and discovered that a
14x24 fits in the filter slot VERY tightly and seems pretty deformed at
that. A 13x23 would fit perfectly.
So my real question, is there a clearinghouse that I can go to for correct
filter sizing? How can I get a model number on this furnace (gas) without
dismantling it?
ANSWER: Neither is the furnace, its long past its normal design service life
14x24 is a standard size and readily available from most suppliers.
Why not just have a filter base installed when you have your new furnace
installed. FWIW, they only build them to last 18 - 20 years. Yours is
already way past that.
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