I have a Lennox Merit series gas furnace ML193UH in my attic. The furnace turns on, but no air blows out of it. So i figured the filter needs to be changed. But I'm not able to find it. The pictures show the furnace i have. I have changed the filter for the main air intake vent. Any thoughts on where the furnace filter is??? Thanks!
Best Answer
If you have a filter in the return air grille, that's likely the only one in this system. Nobody wants to climb into their attic just to replace an HVAC filter, so when a furnace or air handler is installed in the attic these filter grilles allow placement of the filter in a more accessible location. In fact, according to page 6 of this spec sheet for that model furnace, a filter rack is not built into this model and is available as an optional accessory.
So unfortunately, something else is wrong with your furnace...