Need Help w/ Central Air Conditioning

[E-Revonut]

Originally Posted by lincpimp

What do you think of the flexi ducting? I have recently (well in the last 3 years or so) installed a few systems and used the flexi duct in all of them. Seemed pretty good, and was super easy to do. I could easily do a single story house in a day if I was swapping out the old ducting for this... As long as someone could figure out the correct sizes for the various rooms...

Flex is not good for full runs. There is a lot of static loss with flex, a lot of friction on the air passing through because the sides aren't smooth. Generally the most flex I'm allowed to put at the end of a run is 6', sometimes the specs for a job call for no more than 3'.

[lincpimp]

Originally Posted by E-Revonut

Flex is not good for full runs. There is a lot of static loss with flex, a lot of friction on the air passing through because the sides aren't smooth. Generally the most flex I'm allowed to put at the end of a run is 6', sometimes the specs for a job call for no more than 3'.

Good to know, I figured it had to have some problems, as it is so easy to use. We left the bulk of the solid ducting in my house, and just used short lengths of the flexi duct to tie in to the new plenum.