Labconco Type C1 Biosafety Cabinet Models 30468 - Manual (Page 84)

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Inflow Velocity Calculation - Primary Method
Note: The dress panel MUST be installed on the cabinet to obtain an accurate inflow
value.
The average inflow velocity for Axiom models is 105 ±5 FPM. It should be determined
by converting the inflow volume to the average inflow velocity. The inflow volume is
measured directly by sealing a direct inflow measuring flow meter to the face of the
unit. When corrected for local conditions, dividing the inflow volume by the opening area
will yield the average inflow velocity.
Table 5-4
Inflow Test Specifications – 8 inch Sash Opening
Width (feet) 4 6
Nominal Average Inflow
(FPM)
105+/-5 105+/-5
Sash Open Area (Sq. Ft) 2.69 4.03
Nominal Avg. Exhaust Vol.
(CFM)
283 423
Avg. Exhaust Vol. Range
(CFM)
269-296 403-443
Inflow Test Specifications – 10 inch Sash Opening
Width (feet) 4 6
Nominal Average Inflow
(FPM)
105+/-5 105+/-5
Sash Open Area (Sq. Ft) 3.37 5.03
Nominal Avg. Exhaust Vol.
(CFM)
354 529
Avg. Exhaust Vol. Range
(CFM)
337-371 503-553
Acceptance
Average inflow shall be meet the specified value.