Ductwork
- Flex ducts are fluid and navigate attic and roof trusses smoothly.
- Lubbock R-6 minimum Duct outside of building envelope
- No kinks in the ductwork.
- Install duct fully extended; Do not install in the compressed state or use excess lengths to decrease friction loss.
- The routing and length of flexible duct, the numbers of degrees of each bend and the amount of sag allowed between support joints will have serious effects on system performance due to the increased resistance each introduces. Use the minimum length of flexible duct to make connections. Do not install excess lengths of ducts to allow for possible future relocations of air terminal devices.
- Flexible air duct trunk lines should not be limited in length. It is recommended as a guide that flexible air duct branch takeoffs (run-outs), flexible air ducts direct to boots from the plenum and flexible ducts in radial duct systems be limited in length to 25’.
