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.
Installing a microwave roof vent.
Mark the location where you will install the vent.
The lower half of the flange sits on top of the shingles.
Be sure to extend the pipe up at least 2 to 3 above the roof to prevent snow buildup from causing problems.
Transfer this measurement to the oblong duct section attached to the vent cap and.
Vent cap installation measure the distance from the lip of the outer wall opening to the microwave mounting plate.
Nail the lower corners with roofing nails and tar the heads.
Yes you can vent a range hood through the roof using a 6 single wall pipe.
Deduct the footage in the right column from 140 feet for each item used.
How to install a microwave oven over your range and vent it outside to avoid smoke and oil getting on your ceiling.
Cut the hole where you will be installing your venting using a power jigsaw or manual.
The following list provides a few examples of equivalent feet of certain ductwork.
Slide the vent under the shingles so they cover the top half of the vent flange.
The roof cap was done for this stainless steel range hood installation https youtu be 7lvu7lg9zoe was installed a master flow 6 in.
Apply a bead of asphalt roof cement on the bottom of the vent.
Join the sections of ductwork and seal the joints with metallic tape to secure them.
Tighten the bolts to secure the microwave onto the cabinet bottom.
Finish the installation by connecting the power cord and the exhaust adapter if necessary for top venting.
While holding the microwave in place reach up and insert the mounting bolts through the cabinet into the top of the microwave.
Use a laser measuring tool to mark a dot on the ceiling that will identify the center of the hole that needs to be cut.
Plus the total length of straight duct used.