I just moved into a house with a Trane central A/C unit.
The inside air handler is a TWE unit (circa 1998). I found and replaced the
filter at the base of the unit but there is a rubberized opening (@ 3x6")
with a door and a screw holding it shut.
Upon opening it I found what looks to be some kind of insulation or filter.
It is stiff and somewhat yellowed. I'm hesitant to remove the material until
I know what it is.
I downloaded the user manual but it does not mention this part. It only says
to replace the "filter(s)" every month.
Does anyone have a similar unit or knowledge of what this is and should it,
too, be replaced?
Thank you, Robert