Adding hood fan in place of a recirculating over-the-stove microwave

Many recirc vents in microwaves can be swapped between recirc and direct vent. Food for thought.

We just bought a new stove and hood vent and are in the install process at the moment. I removed the old stove and microwave that was above the stove. I demo'd the cabinets that were above the microwave leaving an open space above the stove location.
I have installed the hood vent, cut a hole in the ceiling and installed the exhaust pipe into the attic. I have two options at this point; run the exhaust out through a roof vent, or run the exhaust out through a soffit vent. The soffit vent is a viable option as it does not involve cutting a hole in the roof and having to remove shingles and reinstall shingles. I am doing the work myself, piecemealing phases of the work as time allows (I am building a wooden hood to conceal the vent).
Note: every right 90° angle accounts for 5' of exhaust run and every 45° angle accounts for 3' of exhaust run when calculating CFM efficiency. Your hood vent should have a recommended MAX run for efficiency.

In case of stove fire, you’d probably be better off going thru the roof.

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In case of stove fire, you’d probably be better off going thru the roof.

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Through the roof it is then!