Performance Requirements for Positive Pressure Reduction Devices for Sanitary Drainage Systems (ANSI Approved: 2016)
Positive pressure reduction devices are to be used in building drainage waste and vent (DWV) systems. They are intended to reduce the impact of short duration air pressure transients which arise in DWV networks through use. They are not intended to have any effect on long duration or steady-state offsets in air pressure.
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