Rigar wrote:Off the top of my head...greymetal may offer flow charts for various size ducts online
The most important thing in my oppinion if you are "retrofitting" for lack of better word...(as opposed to having a system built specifically for your home)...is to guage each supply duct to each room
as adequate as possible.I think the previous owner didn't get that done quite well by whoever did it for them. And the old owners put a 1/3 HP motor in to power the blower when the manual calls for 3/4 HP. I am pretty sure that is why the ducts farthest from the blower gets zero air flow.
If the home is of newer construction...there are some pretty basic " rules of thumb" that should work pretty good for you.
It is a 1992. Is the age in the range for the "rules of thumb"?
Location of supply vents and return air vents is important...
...but more importantly in your case would be to "design" your set up around the capabilities of your current furnace..
... btu output and convection blower size (cfm)
It has a nozzle for 120,000 or 150,000 btu.
I'll have to check for sure. And I'll look at the cfm too when I check the btu's.