The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
How to put vent pipe through metal roof.
Try to keep it close to the fan location.
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This may include the round whirlybird types that are placed.
Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.
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Position the vent pipe up to the bottom of the roof.
Slide the rubber boot over the pipe to check the fit.
Prepare the roof area.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
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Go into your attic.
Start in the attic and drill a hole through the roof in the desired vent location.
Once we had the pipe extension connected we figured out where the new vent pipe would need to pass through the roof using a piece of scrap wood held flush with the pipe.
Trace the outline of the base of the rubber boot onto the metal roof with a pencil.
Step 2 run a tape measure over the diameter of the pipe and add 1 2 to 3 4 inch to that before making the cut.
Install the panels leading up to the vent pipe until getting as close as possible to the pipe.
Measure on the panel where exactly the pipe will be located and make a mark.
How to install vents on a metal roof step 1.
Determine the type of vents you wish to install.
This will involve determining the placement of the vents.
Where the scrap wood hit the understructure of the roof we drilled a hole straight through to the outside.
Various size vents will come.