Standard Practice for Electrofusion Joining Polyolefin Pipe and Fittings Ingestion-build-54484 a “single duct” is a

a “single duct” is a flue duct designed and capable of discharging the combustion products and/or air inlet duct for the air supply for only one appliance

BS EN 60623 is a European standard that discusses vented nickel-cadmium prismatic rechargeable single cells for Secondary cells and batteries containing alkaline or other non-acid electrolytes

This covering consists of two or more layers of paper tape and is primarily intended for winding coils for oil-immersed transformers

c) defines notations and conventions specific to this part of ISO/IEC 13249

Standard Practice for Electrofusion Joining Polyolefin Pipe and Fittings Ingestion-build-54484 a “single duct” is a