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Bell and socket, smooth - flow type
tubing and fittings should be used
throughout the system.
When System is used for vacuum
cleaning of abrasive materials. Schedule
Nol40 pipe and cast iron drainage fittings,
or heavier, should be used in place of tubing.
From American Conference of Governmental Industrial Hygienists (ACGIH®), Date: 10-90, Figure VS-40-20, Industrial Ventilation : A Manual of Recommended Practice, 23rd Edition. Copyright 1998. Reprinted with permission.
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