I have a payne PG9MAB forced
hot air natural gas furnace.
It's rated at 80000 BTU. Is it safe for me
to assume that it will deliver 800cfm?
I'm sizing duct and adding branches
to match 800cfm. Am I on the right
The Payne PG9MAB you mention produces about 72,000 bth/hr depending on your
altitude [derate above 2,000 feet - see instructions] - the 80,000 models
comes in several air delivery sizes, namely 3-Ton; 4-ton; and 5-ton. Which
one do you have? Will there be air conditioning? Or just heating. Will
you be running this unit on medium, low medium or low? Will you be sizing
your duct [including return] for .5" w.c. or more, or less? BTW: each
furnace has a different temperature rise according to the air delivery.
What is your target rise?
"jeorme" < firstname.lastname@example.org> wrote in message
Altitude = 600ft
Air Delivery Size = cant find
Air Conditioning = No
Medium, LM, Low = I don't know
is this something I set up? What does
.5" w.c. or more, or less = I don't know what
What is your target rise? = 30F to 70F
The heater says, "40 to 70" on the data
My plan was to run ductboard off the
plenum and tap off vertically to registers
on the first floor (640sq ft.).
Then, the 3 rooms on the second floor:
117, 160 and 54 square feet get vertical
pipes (6", 8" and 5"). I figured with 800cfm
I'd just keep subtracting with each register I
connected or keep adding on the first floor to
bleed off 800cfm.
This is the first home project I've undertaken
where a sneaking feeling that I might be totally
off base keeps creeping in.
I appreciate the interest and advice.
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