I own a 2021 camper when we have the heat on it blows strong out of two ducts the one by the door and the one in the front bedroom. The duct back close to the bunks and the bathroom is very week. Why is that and can I fix that?
You might also check that there isn't extra duct work coiled up under the floor. We had a similar problem. The duct at the far end of the rig had very little flow. I pulled several feet of extra duct from below the floor. Removing the unnecessary extra duct made a big difference.