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Gamewell
Brand of wind-up, fire alarm telegraph system for sending coded pulses to alert central alarm station of fire alarm activation; often still found in red boxes on street corners.


Gate valve
See also Hydrant Gate". Valve in which the shutoff device slides across the flow of liquid to obscure the orofice usually activated by a screw mechanism. Compare "ball valve.


Glas-Master tool
Brand of specialized vehicle extrication tool, most notably including a glass cutting saw for removal of automobile windshields.


Goer
An incident with persons reported.


GPM
Gallons Per Minute or how many gallons are being pumped out of a piece of equipment every minute


GPM method (gallons per minute")
Calculation of how much water, in GPM, will be necessary to extinguish a given volume of fire, under the circumstances (e.g., fuel class, containment, exposures, etc.).


Gravity tank
Water storage tank for fire protection; arranged above protected area to provide flow of water by gravity when needed.


Grease fire
A fire involving any manner of cooking oil or other flammable cooking or lubricating materials.


Ground fire
Fire that consumes the organic material beneath the surface litter ground, such as peat fire.


Ground ladder
A portable ladder designed to rest on the ground. Compare aerial ladder and roof ladder.