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7. Twist-lock the vent cap onto the kast section of vent pipe. Note: If the vent pipe passes through any occupied areas above the first floor, including storage spaces and closets, you must enclose pipe. You may frame and sheetrock the enclosure with standard construction material. Make sure and meet the minimum allowable clearances to combustibles. Do not fill any of the required air spaces with insulation. If area above is a room, install If the area above is not a room, install firestop above