Labconco Precise Controlled Atmosphere and Basic Glove Boxes 5220131 - Manual (Page 13)

Chapter 3: Getting Started
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To connect the Pressure Relief Vent Valve to an exterior exhaust system,
order the Ventilation Kit (#5242700) and refer to Figure 3-1. To provide
HEPA filtered exhaust to the room or outside, order the HEPA Filtered
Pressure Relief Vent Kit (#5238500) and refer to Figure 3-2. To provide
carbon filtered exhaust to the room or outside, order the Carbon Filtered
Pressure Relief Vent Kit (#5241200) and refer to Figure 3-3. The HEPA and
carbon filtered exhaust kits may be used together if required. All kits are
provided with full installation instructions, illustrations, and connections.
See Chapter 7, Accessories, to add a pressure relief valve (#5230600) to the
Precise Basic Glove Box. A 2.06" (52.3mm) diameter hole must be drilled
into the Precise Basic Glove Box shell. This hole is located on the 4.00"
(101.6mm) diameter x 1.00" (25.4mm) high raised boss; the raised boss is
located on the top of the glove box shell, in the front right side corner. Install
the pressure relief valve from the inside with the gasket in place and tighten
the retaining nut from the outside. After installation, the 2.00"-18 UNS
(50.8mm) diameter threads on the pressure relief valve should be exposed.
All vent kits attach to these threads as shown in Figures 3-1, 3-2, and 3-3.
Figure B-1 in Appendix B shows a top view of the exposed threads on the
pressure relief valve. A close up view of the pressure relief valve is shown
below.