need info on installing vent pipe for dryer

[rene19]

House used to have dryer in here before. There is a vent hole going out of the house through the roof.Can someone give me info on how to finish the job, and what other parts I need to get besides the pipe. Aso has electrical outlet. Thanks.

[handyandy]

Off the top of my head, I can think of a couple of things.
1. You will need a decent caulk or something to seal when the pipe goes through holes.
2. You might want to cover the end of the pipe with pantyhose or something to prevent debris, etc. from entering from the outside.

[admin]

So you have a vent hole in your roof? Is the pipe still there, or is it just a hole?

[Czechmate]

...um, are you sure? Because I seem the think that dryer vents should run as horizontal as possible. If its a long run of vent pipe, the warm moist air vapour will condense to liquid and build up in your pipe if it cools! I don't think that you want that running back into your dryer for obvious reasons! But if it does, you can surely purchase "meshed" roof mounted vents for your dryer!

[metalhd2]

The only other part necessary would be a suitable termination
cap. Broan makes a very good one, Model #636 but you should be
able to find a similar one at Home Depot, Lowe's. Remember the
shorter the better on a vertical installation but a run of up
to 20' should be fine. Also take care to install the rood cap
properly under the shingles to avoid a water problem.

[16x80]

quote: The only other part necessary would be a suitable termination
cap. Broan makes a very good one, Model #636 but you should be
able to find a similar one at Home Depot, Lowe's. Remember the
shorter the better on a vertical installation but a run of up
to 20' should be fine. Also take care to install the rood cap
properly under the shingles to avoid a water problem. metalhd2

The termination Broan makes #636 is an excelent choice for a dryer termination! Be sure to remove any screens in the hood to prevent clogging and climbing on to the roof again! (all dryers pass lint)

quote:If its a long run of vent pipe, the warm moist air vapour will condense to liquid and build up in your pipe if it cools! I don't think that you want that running back into your dryer for obvious reasons! Czechmate

Dryer vents are designed to be run as long as 50 ft! However rules apply. Each elbow = 4 ft of straight pipe! Running thru an un conditioned space like an attic the pipe should be insulated to insure the warm moist air does not condense and "rain" back down to your dryer.

Every Dryer passes lint, The lint sticks to the pipe and over time it builds up, This build up causes low air flow! You can tell if you have low flow by your drying times. If you have to dry for more than one 60 minute session you have poor air flow and you should check the venting!

All dryer vent should be run in 4 inch hard pipe, Avoid the flexible hose! (the coils in the hose cause turbulence that slows down air and cause long drying times)!

16x80

If you feel I have missed something or would like me to explain further please let me know!

[Midas]

We're planning to install a thru-the-roof dryer vent, and I've been looking for a good roof cap - so when I saw the Broan 636 recommended here, I decided to visit Broan's website for a look-see. I noticed that nowhere in Broan's description does it state that it can be used for a dryer vent, so I phoned Broan and was referred to their technical dept. They told me that they only recommend this cap for bathroom fan/range hood venting, *not* for a dryer - because they do not want to be liable should problems arise with the dryer vent. They cautioned that a dryer may not push enough CFM to open the damper. So I asked what the minimum CFM needed was and they said 50. I then asked: then if I my dryer pushes at least 50 CFM it should be OK, right? To which they responded "Well... yeah, but you didn't hear us say that."

...Does anyone have first-hand experience of this cap to working properly with a dryer? If not, can you please suggest another roof cap that will work?

[dufax]

quote:Originally posted by Midas

We're planning to install a thru-the-roof dryer vent, and I've been looking for a good roof cap - so when I saw the Broan 636 recommended here, I decided to visit Broan's website for a look-see. I noticed that nowhere in Broan's description does it state that it can be used for a dryer vent, so I phoned Broan and was referred to their technical dept. They told me that they only recommend this cap for bathroom fan/range hood venting, *not* for a dryer - because they do not want to be liable should problems arise with the dryer vent. They cautioned that a dryer may not push enough CFM to open the damper. So I asked what the minimum CFM needed was and they said 50. I then asked: then if I my dryer pushes at least 50 CFM it should be OK, right? To which they responded "Well... yeah, but you didn't hear us say that."

...Does anyone have first-hand experience of this cap to working properly with a dryer? If not, can you please suggest another roof cap that will work?

I ordered The Dryer Box with vent pipe, a roof vent made for venting thru roof and a cleaning brush with 10' of cable. Go to dryerbox.com to see the products. They have 3 sizes of the Dryer Box which saves space and will help on energy costs.