firs - flue
- first air
- First law
- first-hour rating
- fitting
- fixed louver
- fixed setting control
- fixed-setting control
- flake ice
- flame impingement
- flame safeguard control
- flammable or explosive
- flammable refrigerant
- flange
- flanged joint
- flanking
- flanking transmission
- flapper valve
- flare fitting
- flare nut
- flared joint
- flaring block
- flaring tool
- flash chamber
- flash gas
- flash intercooler
- flash point
- flash vaporization
- flash-point temperature
- flashing
- flat plate collector
- flat-face flange
- flat-plate collector
- flavor
- flexible duct
- flexible-shaft centrifugal compressor
- flexing valve
- float and thermostatic steam trap
- float switch
- float valve
- float-type expansion valve
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