A-B 1761-L32AWA Programmable controller

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(f) On flat roofs position the air terminals around the perimeter as shown in figure 3-17. Provide additional air terminals placed at 50-foot intervals over the interior of flat and gently sloping roofs which exceed 50 feet in width. (g) Terminals are to be provided within 2 feet of corners, the end of ridges, or edges of main roofs. (h) Terminals less than 24 inches in height are to be spaced 20 feet or less. Terminals 24 inches or taller may be placed at intervals not exceeding 25 feet.Ensure that no part of the structure extends outside the zone of protection established by the air terminals. For structures with multiple-level roofs no more than 50 feet (15 meters) in height, the zone of protection shall form a cone having an apex at the highest point of the strike termination device, with walls forming approximately a 45-degree (1:1 slope) or 63-degree (1:2 slope) from the vertical. Structures that do not exceed 25-feet (7.6 meters) are considered to protect lower portions of a structure located in a one-to-two (1:2) zone of protection as shown in figures 3-18 and 3-19.

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