My system uses a permanent air filter that is missing. The Model is RUUD UBHB-24J18SUEA. I can't find any literature on it. Is there an owners manual out there somewhere?
There's a sticker on the front that says "Filter Access Panel: The filter installed in the unit is a permanent type and requires periodical cleaning...DO NOT OPERATE THIS SYSTEM WITHOUT A FILTER IN PLACE" I couldn't find any filter. I do have an air handler with a 16 x25x4 filter. Does this take the place of it?
Heating & Cooling - Ruud - UBHC Air Conditioner