Hello, generally the hood outlet placed after the sealant to seal around the pouring of the main floor in accordance with the design of the kitchen corner from top to bottom in a straight line reserved a square hole, and then according to the size of the reserved hole from the flue manufacturer to buy a finished flue. Installation from the basement up splicing until out of the roof, and finally seal the flue around the gap, do leak-proof treatment, painting the flue on the success. I hope my answer is helpful

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