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We have low air flow, as well, in the bedroom of our 2005 Mountaineer 297RKS. We assumed that it was an engineering issue (this, being the duct furthest from the furnace, would have the lowest output). As our rig stays comfortably warm throughout (a bit cooler in the bedroom), we haven't investigated any further. Theoretically you should be able to detect a blockage issue if you cover the other vents and the flow to that vent doesn't improve. If this does work (meaning that this may be an air balance issue), using dampers would be one way of distributing the air more evenly. I'll be interested to see input form others who have pinpointed the cause of the imbalance in their rigs!
P.S. Gruffy has the right idea here. Along with his suggested causes, look for any bends and kinks in the duct that may be severely resticting the flow. Straighter the hose, better the flow (ask the hotrod exhaust guys!). Good luck!!
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