View Full Version : duct size
08-20-2006, 06:58 PM
can anyone give me the room size for 6" duct and 8" duct.say i have a 10'x10' room , would you use a 6 or 8 inch duct .
08-20-2006, 07:43 PM
8" duct with volume damper. You can make an 8 smaller, but you can't make a 6 bigger.
You need a room by room load calc.,Manual J,to determine the cfms(air flow),to then determine the duct size.
Anything else is just a guess,including "rules of dumb".
We have 10X10 rooms that need a 5" to an 8", round duct.
08-21-2006, 03:59 PM
where can i look to get the right CFM's for each room i have
call your local Pro,or do it yourself for a small fee on this site,click right here;
3000 BTU = 100CFM. That should be a 6" pipe if the total equivelent length is not too long.
What is the load on that room?
Does it have lots of windows?
Does it have 3 sides exposed to the outside? etc.
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