Just to add to what Fred W said, I was recently dewinterizing our trailer to go on a trip. I removed the plywood bed above the heat pump to access the water filter and took a moment to look carefully down at the the front of the heat pump, the part facing inside toward the cabin. It did not have an air filter, rather it had tightly packed air fins like you would see on an outside unit part of a house heat pump.
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2019 Forest River Rockwood A213HW
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