gas - head
- gravity-circulating system
- grille
- grooved joint piping
- grooved-joint piping
- gross capacity
- gross collector area
- gross floor area
- gross load
- gross refrigerating capacity
- gross roof area of a building
- gross wall area
- ground
- ground coupling
- ground fault
- GTAW
- guide vane assembly
- guillotine damper
- Guldberg and Waage law
- half-duplex
- halide torch
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