HVAC Support Spacings ... can I get farther?
HVAC Support Spacings ... can I get farther?
(OP)
I need to get a piece of duct work...
36"ø
galvanized steel
internally insulated
spiral seam
24GA
2" wc pressure rated
...from one building to another.
SMACNA "HVAC Duct Construction Standards - Metal and Flexible" states in Table 5-2 that I can support at furthest every 12 feet.
Thing is my building spacing is over 14 feet apart.
Besides building a monstrosity of a 30 ft+ tall support structure in between the buildings, is there any way I can increase the distance I can span my duct work? SMACNA "Round Industrial Duct Construction Standards" says in Table 8-1.1 That if I increase duct gauge to 16, I can span up to 20 fee, though chapter 8 says it is limited to indoor applications without weather conditions (wind, ice, and snow load). Any other ideas?
36"ø
galvanized steel
internally insulated
spiral seam
24GA
2" wc pressure rated
...from one building to another.
SMACNA "HVAC Duct Construction Standards - Metal and Flexible" states in Table 5-2 that I can support at furthest every 12 feet.
Thing is my building spacing is over 14 feet apart.
Besides building a monstrosity of a 30 ft+ tall support structure in between the buildings, is there any way I can increase the distance I can span my duct work? SMACNA "Round Industrial Duct Construction Standards" says in Table 8-1.1 That if I increase duct gauge to 16, I can span up to 20 fee, though chapter 8 says it is limited to indoor applications without weather conditions (wind, ice, and snow load). Any other ideas?





RE: HVAC Support Spacings ... can I get farther?
you can find detail for protrusion through building expansion joint and apply it.
as for suspension, i believe you have to make support rail all along the duct.
RE: HVAC Support Spacings ... can I get farther?
Simple sketch linked.
Now, what about the wind that wants to blow the duct sideways?
Can you discuss with a structural engineer?
RE: HVAC Support Spacings ... can I get farther?
With diagonals capable of resisting tension and compression, as well as the wind and seismic, this is very doable. Incline the verticals to the sides as well as vertically, and use steel angles.
Mike McCann
MMC Engineering
RE: HVAC Support Spacings ... can I get farther?
RE: HVAC Support Spacings ... can I get farther?