Considering that back pressure higher than 6 wci is generally recognized as inefficient you can see that venting through the roof with non dryer specific vents is immediately problematic.
Installing a vent through roof.
Choosing a whole house fan.
Installing a range hood vent through the ceiling is also called venting vertically and this is the method we recommend.
Position the vent pipe up to the bottom of the roof.
Go into your attic.
Apply a bead of asphalt roof cement on the bottom of the vent.
To vent a range hood through a wall or roof you have to open up a hole in the ceiling using a drill machine.
Nail the lower corners with roofing nails and tar the heads.
Next position your ladder against your home and climb up to your roof.
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This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Then flash it with the shingles that you removed prior on both sides and above the vent.
Unlike the vents shown above left the dryerjack affects airflow by less than 01 water column inches of pressure.
The code requires a 10 foot horizontal distance from any.
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First head up to your attic and determine where you want to install your roof vent.
The vent opening must be far enough above the roof and away from doors and windows to prevent the sewer gases from drifting into the house.
The lower half of the flange sits on top of the shingles.
Seal between the top of the vent flange and at the bottom of the roofing shingles as well.
Locate the drill bit.
The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
Slide the vent under the shingles so they cover the top half of the vent flange.
You should start by drilling a hole through the roof and make sure it goes through where you want your vent to go.
Install the vent and seal the underside of the vent flange with roofing grade sealant caulk.
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