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VAV Constant Face Velocity Fume Hood
                                  
Laboratory Air Flow Control System

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LBNL
Accu Aire
w/Sash Positioning System (sPs™)
Phoenix
w/Usage Based Control® (UBC)
6' Nominal Vertical Rising Fume Hood
w/ face velo = 100
720 cfm

w/ face velo = 60
420 cfm

w/ face velo = 60
420 cfm
w/ face velo = 60
420 cfm
Annual Net Ft^3 of Out Side Air Processed
26.95 x 10^6                                18.5 x 10^6                                31.809 x 10^6
Phoenix - Worst

50wk x 720 ft3/min x   8 hr x 60 min/hr x 0.05 = 0.864 x 10^6
50wk x 420 ft3/min x   8 hr x 60 min/hr x 0.95 = 9.576 x 10^6
02wk x 420 ft3/min x   8 hr x 60 min/hr x 1.00 = 0.403 x 10^6
52wk x 420 ft3/min x 16hr  x 60 min/hr x 1.00 = 20.966 x 10^6
                                                                            = 31.809 x 10^6
Weekdays
5pm to 8am - 16 hours
Constant
8am to 5pm - 8 hours
Constant
Phoenix
w/Usage Based Control® (UBC)
Weekends and Holidays