29 Guage galvalume steel ducts
Lengths up to 20' 3"
Standard length is 40 5/8"
|
![1 piece duct](duct-1.jpg) |
Trunk lines
Perimeter dimensions above 38 5/8" will require a 2
piece
duct
Standard = 6"x14"x405/8"
Max dimensions = 68" (34" per piece)
Examples: 12"x22" 10"x24"
18"x16"
Walls over 14" will require support ribs
2 per section or 36" o/c whichever is more
|
![2 piece duct](duct-2.jpg)
![Snap.jpg](http://durableduct.com/Designs/Snap.jpg)
|
Massive Trunk lines:
Perimeter dimensions above 68" will require a 4 piece
duct
Will require support ribs at 24" o/c |
![4 piece duct](duct-4.jpg) |
http://durableduct.com/designs/duct-1.jpg |
![Support ribs](Stiff-1.jpg) |