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I have a gas furnace with AC sitting on top, the air goes out thru the top-in the pic below, on the left is the return ducting coming into the unit(where air gets sucked in)...there is a filter on the other side of the house where the air comes in but I'm wondering if there is another one somewhere inside the actual unit? I've looked in the area shown in the picture but above that is a plenum that I don't want to tear into if I don't have too unless that is a common place for a filter to reside...I just want to make sure I'm changing the filter if necessary. Thanks.
I have a gas furnace with AC sitting on top, the air goes out thru the top-in the pic below, on the left is the return ducting coming into the unit(where air gets sucked in)...there is a filter on the other side of the house where the air comes in but I'm wondering if there is another one somewhere inside the actual unit? I've looked in the area shown in the picture but above that is a plenum that I don't want to tear into if I don't have too unless that is a common place for a filter to reside...I just want to make sure I'm changing the filter if necessary. Thanks.
You probably only have the one [return air] filter that you have already found. Filter(s) can be mounted inside the air handler unit itself or loacted somewere else in the return air system. Sometimes (depending on the system design, size, etc.) there is only filter, and sometimes there are numerous filters mounted throughout the house.
If the [one] filter you have already found measures about the same size as (what appears to be) your one return air duct that enters the botton-left of the air handler, then it suggests to me that you only have the one filter.
While some units will have a filter inside the unit (where you took the photo), the fact that you found one in another part of the house. at the return grill tells me thats the only only.
While some houses may have numerous filters located throughout the house, you don't want to have TWO filters on the same duct run. Meaning, if you have a filter on the end of the return run, you shouldn't have one at the air handler (where you took the photo), but you may have more than one return grill in your house because the return run has branches in it. Clear as mud now?
Ok, so I guess there is only the one filter that I already found. Thanks!
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