Round or square openings through a 3-inch Type N roof deck are centered on a low flute with a maximum diameter of 13 inches. Reinforcement extends a minimum of two flutes beyond the opening on each side.
3" - TYPE N ROOF DECK REINFORCED OPENINGS: CENTERED ON LOW FLUTE AS SHOWN ROUND OR SQUARE OPENING THRU (1) DECK LOW FLUTE 13" DIA. MAX. EACH SIDE EXTEND (2) FLUTES MIN. BEYOND OPENING
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