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NSF/ANSI 358-1-2022
Polyethylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems
The physical and performance requirements in this standard apply to plastic piping system components as well as nonplastic components of the ground loop heat exchanger including, but not limited to, pipes and fittings used in water-based ground-source heat pump systems.
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NSF International [nsf]