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Must and should are the key words. No matter what you do, you still have a 4" vent . If you were doing this yourself, I would stick to what the local Ace, Home Depot have in stock. As long as you maintain a open unobstructed transition to the 4" exhaust pipe, hose, you should have no problems venting to the outside. Outside labor can easily double the initial cost of the microwave. I custom made my vent from what parts that were available at my local hardware stores and it came out fine.
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