Labconco Fume Adsorbers 3955422 - Manual (Page 34)

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To determine the actual face velocity at the sash opening, airflow velocity readings
will need to be taken across the opening. 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 plastic
hood canopy and the second row is 3" up from the work surface.
Model Size 30" 60"
Height from Work Surface (inches) 13.50 13.50
Total Open Area with Bypass (sq. ft.) 2.75 5.55
Exhaust Airflow Volume at 35 fpm (CFM) 100 200
*Motor Horsepower (HP) 0.05 0.10