the standard size for ductwork flex connection off of a unit?

Question

what is the necessary size for the fabric

Answer 1

on 90% of the houses we build, 2.5 - 3.0 ton is about standard for avg. house size and my HVAC man will use a 16" round main and run 8" flex to the vents.....smaller rooms he may run 6" u can figure 12, 8" runs on this size unit stated above.....and 4 6"......and remember to "step down" the main near the end to increase pressure......

lic. gen. contractor

Answer 2

Most forced-air heating systems use what is called an extended-plenum approach. A large rectangular metal box attaches to the furnace supply opening. Main trunks (smaller than the furnace's plenum) are attached to the large rectangular box (sometimes 2-3 trunks will exit the main plenum). Branching out from these rectangular trunks are the pipe (6" round normally) runs that lead to the heating registers. There is no standard size for the supply plenum nor is there a standard size for the main trunk branches. The rectangular trunks are usually 8" in height, and each section is normally 4 ft. in length.(the width is normally 8, 10, 12, 14, 16, 18, 20, 22, or 24" ). Flex connectors themselves are usually 8" in height, the width of the duct to which they are attached, and 6-3/4" in length. The fabric itself, not counting the metal attached to it, is about 3-1/2 to 4" in width. Hope this info is helpful to you. Good luck.

Answer 3

1.5 ton = 12" / 2 ton = 14" / 2.5 ton = 14" / 3 ton = 16" / 3.5 ton = 18" / 4 ton = 18" / 5 ton = 20". Rule of thumb
sizes for supply air trunk-line off the top of unit. You
need to know your systems size ie. tonnage

Answer 4

Need more info. Where is it coming off the unit at? What size room is it supplying......ect.

Answer 5

off of the main trunk line to the room defuser can be 4 inches diameter

Answer 6

look at your DUCT-U-LATOR to get all the proper sizes

the material is a Mylar Plastic.
fabric being sound attenuating

Answer 7

8" is standard size for duct work