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-   -   Central heating system with no spot for filter? (http://www.diychatroom.com/f17/central-heating-system-no-spot-filter-159266/)

Chris Sweeney 10-07-2012 11:01 AM

Central heating system with no spot for filter?
 
My friend lives in a house with central heat/AC. I could be wrong, but where the return duct comes back into the main unit, shouldn't there be a spot for a filter? In this case, there is not a spot; it is just taped shut.

Could this be normal, or no? I've never seen a central air/heat unit without a main filter, and I can't imagine all the dust/dirt/debris/etc. that the blower motor and other components are collecting. Could the filter(s) be located at each return vent in the house (those vents are only 6"x9")? If so, I'd assume that there should still be a filter at the main unit.

carmon 10-07-2012 12:18 PM

you are correct ...there should be a filter...:eek::eek:

biggles 10-07-2012 12:59 PM

trace back from the unit all the returns have to hit the main return someplace...filter might be there.if not remove the supply fan access panel and where the return comes into the unit slide one in there for now...no big return grill somewhere around the stat area as usual

Chris Sweeney 10-07-2012 01:52 PM

Just checked in the basement...no signs of filters anywhere along the return ducts. Any other suggestions anyone?

redman88 10-07-2012 01:57 PM

is there a plate on the return duct that could be removed, plate would be the same lenght as the duct and about 2-3 inches wide, held in by 4 screws

Chris Sweeney 10-07-2012 02:12 PM

Quote:

Originally Posted by redman88 (Post 1025953)
is there a plate on the return duct that could be removed, plate would be the same lenght as the duct and about 2-3 inches wide, held in by 4 screws

Hmmm, where on the return duct? Right near where it enters into the main unit?

gregzoll 10-07-2012 02:17 PM

It should be right at the unit, or can be inside once you remove the blower access door.

Chris Sweeney 10-07-2012 03:52 PM

Here are a couple pics. This first pic shows the return on the right coming in to the furnace on the left. It's foil-taped shut (no spot for a filter):

http://i351.photobucket.com/albums/q...0-07161251.jpg

In this second picture, I removed the access panel on the back of the furnace unit. Still, nothing where the return duct (left) comes into the furnace (right):

http://i351.photobucket.com/albums/q...0-07162336.jpg

gregzoll 10-07-2012 06:30 PM

If there is not a spot at the furnace, or inside the furnace at the blower area, probably was one placed into the returns, if they are large enough to hold one either flat inside, or at a angle inside the opening.

techpappy 10-07-2012 08:22 PM

That second pic looks like the ID Fan ...Open panel/door to access circulating fan /motor..could be filter rack in there.

redman88 10-07-2012 08:29 PM

Quote:

Originally Posted by techpappy (Post 1026155)
That second pic looks like the ID Fan ...Open panel/door to access circulating fan /motor..could be filter rack in there.

that would place the filter way close to the burners

techpappy 10-07-2012 08:53 PM

It does look like there should be a filter channel in the return duct near thr furnace, however, as is the case with my furnace, there may be an access door to the circulating fan where there is a filter rack on top..they do exist in some furnaces including mine.

Nickhvactech 10-07-2012 10:46 PM

1 Attachment(s)
Attachment 58498
You may have somethin SIMILAR to this in the blower cabinet itself.. Look and see, if not a filter rack needs to be installed:thumbup:

gregzoll 10-07-2012 10:55 PM

nickhvactech, did you not read the whole thread.

Nickhvactech 10-07-2012 11:01 PM

Nope.. now that i have, i get your point ! :eek:

NEWBIE


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