An eighteen by eighteen inch exhaust duct is routed within a shaft, connected to a triple air valve assembly. The system is rated for a maximum airflow of one thousand six hundred eighty cubic feet per minute at a maximum air velocity of eight hundred feet per minute. A secondary sixteen by sixteen inch duct routing is positioned alongside the exhaust shaft.
16x16 18x18 EXHAUST DUCT IN SHAFT. MAXIMUM 1680 CFM AIRFLOW AT MAXIMUM 800 FEET PER MINUTE AIR VELOCITY NONE 3 TRIPLE AIR VALVE
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