Originally Posted by donjuanss
When I had floor vents I used regular window screen material. Just cut it to the size of the vent not the hole then set it down and put the vent back on it. It really helped keeping big things out of the vent.
That's a good idea. The gas furnaces on RVs requires a certain amount of air movement or the burn chamber can overheat. I don't think that the filters would initally be a problem in most cases but you would have to be very carefull to change them out regularly. I like the window screen idea though, might just have to do that myself.
I would think though that if you were to put a metal cover with say a 1" dia. hole over the vent at one end of the run, then complely cover the other vents along the line, then put a shop vac at the other end of the run you could suck just about anything out of the vent system to clean it out once a year.