Section 1 - Installation
(Refer to illustrations at the end of this section)
1.1 Location
Locate the cabinet on a level surface in an area of mini-
mum temperature change. The cabinet should be placed away
from personnel traffic, air-conditioning or heating ductwork,
and/or laboratory windows and doors. Proper cabinet location is
essential as drafts can disrupt critical air flow characteristics
and allow room contaminants to enter or escape the cabinet
work area.
If space permits, twelve inches should be clear on each
side of the cabinet for maintenance and best cabinet perform-
ance. A twelve inch space should also exist from the top of the
cabinet to the ceiling.
1.2 Leveling
Place a bubble-type level on the work surface and check to
see if the cabinet is level. Adjust the leveling feet until the cabi-
net is level and the most comfortable working height is
achieved. Make sure that all four leveling feet are fully flush
against the floor to prevent vibration.
1.3 Power Connection
Refer to the electrical schematics in the back of this manu-
al or to the electrical data plate mounted on the unit.
1.4 Plumbing Connection
Two petcocks are piped on each side of the cabinet work
area and are connected to 3/8” FPT couplings in the inner side-
walls. An optional third plumbed line may also be added to the
cabinet.
Access to all internal couplings is through one-inch,
plugged access holes in each side panel and both sides of the
back panel of the cabinet.
It is not recommended that flammable gases be
used in the cabinet. Observe all labels pertaining
to restrictions and operating pressures.
1.5 Exhaust System Connections
a. Canopy (thimble) Connection
Per NSF Standard, NSF 49-1992, Page E2:
“When a canopy (thimble) is used, the opening in the
canopy should be checked with a smoke stick when the cabinet
is recertified to ensure that internal air turbulence does not
cause outward air leakage. If the type A cabinet is hard connect-
ed to an exhaust system, the cabinet should be interlocked with
the blower in the duct or the building system to prevent pres-
surization of the exhaust system. In addition, type A cabinets
hard connected to an exhaust system should not be turned off
while the exhaust system is functioning.”
It is also recommended that the building exhaust system
should be sized to exhaust 30% more air than the cabinet
exhausts, the balance to be made up with room air. This will
help to insure proper cabinet air balance at the front access
opening and thus adequate containment.
1.6 Exhaust Requirements
Filtered air from the cabinet may be exhausted directly into
the room or, if safety requires, be vented to the atmosphere
through an external exhaust system.
a. Direct Room Exhaust
When directing exhaust air into the room, adequate space
must be provided between the cabinet and the ceiling to allow
discharged air to flow freely.
1. Remove the cardboard cover plate from the top of the
unit.
2. Remove the cap nuts and washers (located on top of
unit, installed at factory) that will secure the exhaust fil-
ter grille.
3. Install the exhaust filter grille.
b. External Exhaust System
When an external exhaust is required, the cabinet must be
connected to a dedicated exhaust system. The exhaust system
should be prepared before moving the cabinet to its location.
The exhaust system should have safeguards
against exhaust failure. It is recommended that a
bio safety officer or industrial hygienist review
the agents and chemicals used within the cabinet
to determine if additional filtration treatment is
necessary before venting to the atmosphere.
Model 1200 Series _____________________________________________________________________Installation
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