Labconco Class I Enclosure Models 3980423 - Manual (Page 10)

Chapter 2: Prerequisites
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6
Support, Vibration and Movement
Requirements
At a minimum, the supporting structure usually consists of a base cabinet and
chemically-resistant work surface.

A stand or mobile bench is not recommended if the enclosure will be used for
precise weighing of powders.
Location and Air Current Requirements
The Purifier Filtered Enclosures have been designed to contain hazards by
negating typical cross drafts and turbulence within the opening. However, as a
precautionary safety measure and a higher level of quality management, it is
recommended that the enclosure be placed in an area to avoid:

High traffic areas where walking might cause an air disturbance or be a
nuisance.

Overhead or wall HVAC diffusers, fans, radiators or other lab equipment
producing air currents.

Next to doorways or windows that may be opened.
Do not position the unit so that it is difficult to operate the main
disconnect device.
Ne placez pas l'appareil de sorte qu'il est difficile de faire
fonctionner le dispositif principal de déconnexion.
Exhaust and Blower Requirements
The Purifier Class I Enclosure and Purifier Filtered Enclosure use an integral
motorized impeller to draw room air past the operator and through the enclosure.
This contaminated air is then pushed through the HEPA filter. The HEPA-filtered
exhaust air is then forced out the top of the enclosure. An optional carbon filter
may be installed on the downstream side of the HEPA filter to protect against
nuisance odors.
The HEPA-filtered exhaust air can be recirculated into the laboratory or exhausted
outside with the addition of the thimble exhaust connection and remote blower
listed in Chapter 7. Data for the exhaust volume and enclosure static pressure loss
are listed for each filtered enclosure model at face velocities of 60, 75, 80, 90, 100,
and 105 fpm.
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