I also had concerns about the amount of air coming out of the vents. It think we have all learned that the air will be less than what we had been used to. But I was still concerned. One thing I had to correct was the warm air coming from the revolution into the duct work was recirculating back through my propane furnace and not all going into the duct work. I ended up making a homemade backdraft preventer that I can slide into the plenem on the ductwork so the revolution heat can only go up and not back thru the propane furnace.
If you haven't already, I would make sure that not too much warm air is going back thru your existing furnace.
If you haven't already, I would make sure that not too much warm air is going back thru your existing furnace.