A-B 1784-KTX Communication interface card

Content introduction

Where air terminals are mounted on or very near [less than 1.5 meters (5 feet)] to vents or stacks that emit potentially explosive or ignitable dusts, vapors, or gases, provide additional clearance. Over hooded vents emitting explosive substances under natural draft, the air terminals should extend at least 1.5 meters (5 feet) above the opening. Above open stacks emitting explosive substances under forced drafts, air terminals should extend at least 4.5 meters (15 feet) above the opening. (e) Locate air terminals along the ridges of gable, gambrel, and hip roofs as shown in figures 3- 15 and 3-16. Place them on the corners and along the edges of gently sloping roofs having a span of 40 feet or less with a rise-to-run ratio, i.e., pitch, of one-eighth or less or having a span greater than 40 feet and a rise-to-run ratio of one-quarter or less.

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