I'm have some issues with airflow (more like lack off airflow coming out of many of my registers) in my hookup of a St. Croix SCF-50 pellet furnace. The diagram here illustrates the pipe coming from the furnace that hooks into the supply air and one thing that I notice is it goes in through the side. I see three potential issues with my setup: 1) I've got mine hooking in the main trunk through the bottom of the main trunk near my oil furnace with a backdraft damper sitting in between the oil furnace and the supply plenum opening. Air just goes straight in through the bottom with no angle to try and direct it across the main trunk. 2) I've got a pipe almost directly above the supply plenum where the hot air enters, so it might be directed up first and not across... I think that might be my issue as I might not be getting the pressure in the ducts that I need... 3) The 800 CFM blower just can't handle the amount of duct work in the house and if that is the case, do I have any alternatives to make things work better... Stronger blower...? Blower in the duct work?