Originally Posted by
Randy Clayton
Ok this is what I see is that there is no back pressure being present; that with that duct being installed directly into the back of the plenuim box the majority of air like water will take the path of least resistance; and will flow straight through the box and not out the side ducts with out this back pressure?
I may just be old school or am I missing something that I'm overlooking?? Still does not make scince to me.
Randy,
Depends.
As in "depends on where/what that duct goes to.
It may go to another distribution box, in which case the entire duct would reach some static pressure level, depending upon the design of the system.
You don't want that going straight to a supply register, no.