Insert the fan assembly into the opening you made in the cabinet for it.
How to install a kitchen exhaust roof vent.
Back in the kitchen mark the cabinets and cut holes for the ducts.
Connect vent hose to exhaust outlet and push excess into ceiling.
Slide the vent under the shingles so they cover the top half of the vent flange.
Turn your vent upside down and apply a thick bead of caulk to the flange.
Attach all ductwork then go up to the attic and reposition the plumb bob so it drops straight into the middle of the pipe coming up from the kitchen.
Apply a bead of asphalt roof cement on the bottom of the vent.
Plug power plug into receptacle.
Route the vent hose tubing through the holes in cabinet and ceiling and push up into the ceiling.
The lower half of the flange sits on top of the shingles.
Some will mount from above while some will mount from underneath.
You may have to shift the vent position several inches to avoid ceiling and roof framing.
Nail the lower corners with roofing nails and tar the heads.