We put sheet metal around hood. From the rear top of the hood to the wall and down the sides and triangle pieces on the sides of the hood. But I don't know if this is good because there is more of a box in the rear and not so much on the sides. The hood itself only measures 20wx14deep. From the front of the hood to the back wall is about 30".That's just metal tape in the front for a baffle. ( I know it's pretty bad looking)!
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