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*excludes XPert Filtered Balance Station, since it has no
integral blower.
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