3. Item 3: it was acceptable to delete the gravity dampers to improve fan
performance since the fans operate 24 hours a day.
But, for intermittently used fans or fans serving special areas, the A/Es must either
allow affect of gravity dampers on fan performance or specify use of motorized
dampers instead of gravity dampers. The motorized dampers provide positive
control and help fan performance but cost more.
FOR ADDITIONAL INFOR MATION:
Contact Satish Sehgal at 202-565-5032 in the Standards Service (187C)..
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