Labconco Class I Enclosure Models 3980423 - Manual (Page 73)

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NCLOSURES
To determine the actual face velocity at the sash opening, airflow velocity readings
will need to be taken. This should be done across the sash opening of the
enclosure in accordance with the Industrial Ventilation Manual. (See Appendix E)
The “average face velocity” is achieved by taking readings in two rows across the
enclosure with the readings 6" from the ends and evenly spaced every 12"; the first
row is 3" down from the upper sash foil and the second row is 3" up from the work
surface. A total of four readings will be taken for the 2' enclosure, six readings
taken for the 3' enclosure and eight readings taken for the 4' enclosure and then
averaged.
Model Size 2' 3' 4'
Sash Height from Work Surface (inches) 9.44 9.44 9.44
Total Open Area with Bypass (sq. ft.) 1.45 2.20 2.95
Exhaust Airflow Volume at 90fpm (CFM) 130 200 265
Alarm Airflow Volume at 60 fpm (CFM) 85 130 175
Initial Mag. Gauge Pressure Reading (inches H
2
O) 0.20 to .045 0.15 to 0.40 0.10 to 0.35
Number of Laskin Nozzles needed at 10 psig 1 1 1
Exhaust HEPA Filter w/ Gasket Dimensions (inches) 18x18x3.31 30x18x3.31 42x18x3.31
*Motor Horsepower (HP) 0.13 0.13 0.30
*Capacitor (MFD, Volts) 10MFD, 115V
(2) 4MFD, 230V
10MFD, 115V
(2) 4MFD, 230V
15MFD, 115V
4MFD, 230V
Fluorescent Lights F15T8-SP35 F17T8 F25T8
UV Light on Class I only G15T8 G15T8 G30T8