I have a Lennox Furnace. The filter is a huge basket like thing with
fiberglass in it. It is supposedly washable. But it's so big I can't put
it in the sink. I take it outside and wash it with the hose. Obvoiusly I
can't do that in the winter. Besides that the fiberglass keeps coming off.
I've replaced the fiberglass but it's a pain in the butt.
Anybody know of any way to modify it so I can use throw away filters? I've
asked a couple furnace guys and their response is usually they'll fix is for
a couple thousand dollars and throw in a new furnace.
If you have the old "hammock style" filter, you probably DO need a new
furnace. I don't think they have made those for 35 years.
Try replacing your return grill with a filter grill. That way you can do
away with the old system and use disposable ones...
If your old furnace is in good shape, keep it. Hvae a similar situatio. I
checked with Lennox and my furnace, at the time of manufacture, was over 80%
efficient. In my climate, I'd still only buy 80+, unless I found higher on
The filter is a hassle to replace and you can only get it from Lennox dist
> Try replacing your return grill with a filter grill. That way you can do
I've looked into replacing the return grill (if that's what it's called),
also called plenum. Most outfits are not interested, by pricing it
accordingly. Suppliers sell a pre-made filter plenum for about $100, maybe
just under. This seems like a worthwhile modification, if it fits with min
mods and you can DIY or have a friend do it.
Makes sense only if you plan on keeping the furnace for a while. Of course
you might be able to reuse the plenum and save, if a new furnace is
installed in the future. Again that's theoretical, since most outfits will
not give you discount for that, even if it fits.
First of all, fiberglass filter material for those hammock style
Lummox's are NOT washable. It comes in a roll. You cut off the length
you need. It gets dirty and you throw it away. Then you put some more
in. You can get the shit at Johnstone and Grangier and probably a
million other places. You can also modify the return duct filter to
accept a normal filter rack if you have the space and that particular
configuration. Otherwise...........................you have an old
clunker. I can replace it for several thousand dollars.
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