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Relative humidity
Relative air humidity is a term used to describe the amount of water vapour in the air.
Return temperature
Return temperature is a term describing the return water temperature in a heating system.
Roof tank systems
Roof tanks are fresh water tanks, placed atop high-rise buildings.
Rotating part of shaft seal
The rotating part of the seal is fixed on the pump shaft and rotates in the liquid during pump operation.
Rubber
Rubber is used as a part of the shaft seals that prevent the pumped media from running out of the pump.