| FIR | naval radar that controls the delivery of fire on a military target |
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| FIR | naval weaponry consisting of a system for controlling the delivery of fire on a military target |
| FIR | the department of local government responsible for preventing and extinguishing fires |
| FIR | a fire-resistant door that can be closed to stop the spread of a fire |
| FIR | an exercise intended to train people in duties and escape procedures to be followed in case of fire |
| FIR | any of various large trucks that carry firemen and equipment to the site of a fire |
| FIR | a stairway (often on the outside of a building) that permits emergency exit in the case of fire |
| FIR | a manually operated device for extinguishing small fires |
| FIR | a member of a fire department who tries to extinguish fires |
| FIR | fire iron consisting of a metal rod with a handle |
| FIR | a large hose that carries water from a fire hydrant to the site of the fire |
| FIR | an upright hydrant for drawing water to use in fighting a fire |