You can buy the proper flashing to install it on a flat roof and a roof cap that has screen around it to prevent insects from entering.
How to install microwave vent through roof.
Be sure to extend the pipe up at least 2 to 3 above the roof to prevent snow buildup from causing problems.
Wear heavy gloves and use the tin snips to carefully trim the duct section to the required length.
Leave the drill bit sticking through the roof so you can find the hole.
Dry fit the vent cap.
A vent should be installed between them when possible.
Drill holes at the corners of the outline then cut out the vent opening using a jigsaw or reciprocating saw.
Use a hammer or a drill with a small bit to locate any wall studs or ceiling joists.
Tape the paper template to the bottom of the upper cabinet.
Start in the attic and drill a hole through the roof in the desired vent location.
It may be necessary to install a new exhaust adapter but you can use the existing roof or wall vent route.
In the attic mark a spot directly above the duct so you can cut a hole in the roof decking and extend the vent pipe up through that opening.
Mount a tube of outdoor quality.
How to install a microwave oven over your range and vent it outside to avoid smoke and oil getting on your ceiling.
Otherwise a roof vent will be needed.
Try to keep it close to the fan location.
If there is no existing venting route decide which option is best for your kitchen and use the template provided to open a vent in the wall or cabinet.
Proper range venting is very important to follow the manufacturer s specifications for installing a new vent.
Vent cap installation measure the distance from the lip of the outer wall opening to the microwave mounting plate.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
Outline the location of the vent opening on the bottom of the upper cabinet.
Mark the location where you will install the vent.
Yes you can vent a range hood through the roof using a 6 single wall pipe.