Could have some collapsed insulation, or something else in there. Or the duct may have come loose from vent. You could run a wire puller or similar through duct and see if you feel blockage. Another trick I have done is pull the vent and stick a leaf blower in there. We do not use the gas heat unless absolutely necessary. $$$ We use two space heaters, running off the campground power system. Our 279 RLSS blows like a hurricane! And just about as loud!
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