Start in the attic and drill a hole through the roof in the desired vent location.
Range hood vent through metal roof.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
The trickiest part of installing a range hood is determining how to run the ventilation ducts.
Depending on the location of your range you will need to decide if it is easier to vent through an outside wall versus up through the roof.
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My range hood was vented through the roof but is not centered over the range hood.
Leave the drill bit sticking through the roof so you can find the hole.
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Use this tutorial if you determine that venting through the roof is the best route.