how to make 90 turn of 4" dryer vent in 2x4 wall

hohadcr · 03-12-2010, 08:16 AM

hi, i am wondering how to make the turn for dryer vent in the normal 2x4 wall frame. I am imagining that i need to make room for the 4" pipe' 90 degree turn, which means some of the 90 degree turn should be sticking out the wall. but i see in some other new apartments, the dryer vent hooks on a vertical wall w/o sticking out the wall.

What is the right way to do it?

thanks

Marty S. · 03-12-2010, 09:02 AM

Straight pipe through the wall , cover it with a drier vent cover. Make your 90 inside the house pointing down to the drier.

Thurman · 03-12-2010, 11:14 AM

Change from round to "square" duct within the wall. Rectangular ducting is "square' duct. But--which way will this exhaust run? Up, down, right, or left from the dryer connection. It's easy to make dryer ducting too long, resulting in reduced air velocity which allows the lint to build-up within the ductwork. In the past twelve months I've been called to "unstop" dryer ducting which was 4" PVC piping placed before the concrete slab was poured. One horizontal run was 28 ft. Way too much. David

hohadcr · 03-15-2010, 09:19 AM

i would dscrebe it as :dryer vent goes to left, turn 90 up till above the ceiling, then turn 90 across the ceiling till the back wall...

well back wall is the only wall i can use, which would be also 30ft horizontally right before it gets open air. what else can i do?

hvac122 · 03-15-2010, 09:28 AM

30' is way over code here for a dryer vent. Unless your dryer manufacturer says it can go that far I would look for a different alternitive.
Each turn also takes off of the total length.

Marty S. · 03-15-2010, 10:59 PM

Going to need a commercial drier to go that far. Home duty ones max out at 15' ft with no more then 2 90's. How about up through the roof and eliminating that 30 ft horizontal?