Labconco Protector XL Floor-Mounted (Walk-In) Laboratory Fume Hoods 1128 Series - Manuel (Page 33)

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Original instructions
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Performance Features:
The Protector XL Floor-Mounted Laboratory Hood is designed to meet the needs
of the laboratory scientist who must transport equipment and products for
experimentation and testing at OSHA approved high performance/low flow
velocities for vertical sashes as low as 60 feet per minute and horizontal sashes as
low as 80 feet per minutes. Vertical Floor-Mount Hoods are high performance.
The laboratory fume hood has been designed to effectively contain toxic, noxious,
or other harmful materials when properly installed. A fully featured by-pass hood
with perforated baffle and by-pass block, this hood maintains safe airflow.
Optional energy saving A-Style Combination Sash models are also available. The
hood features by-pass airflow design that allows the hood face velocity to remain
relatively stable as the sash is closed. Airflow is diverted behind the front panel
and through the perforated sash handle to help control fluctuations in face
velocity, which occur as the sash is closed.
1. a. Vertical: Unique sash provides maximum visibility of 73.5" high
while conserving energy by limiting sash travel to 28". Vertical-rising
sash may be raised from a closed to 64" operating height. The fume hood
features a containment-enhancing sash handle. Vertical Floor-Mount
Hoods are high performance. Optional sash stops are available to limit
sash height and reduce energy usage.
b. Horizontal: The horizontal sliding sash doors provide maximum
visibility and load height of 73.5". The total exhaust volume is based on
half the opening on the 8' model and one quarter the opening on 10', 12',
and 16'.
2. By-pass airflow design ensures relatively stable face velocities.