dive - drop
- diversion fitting
- diversion pipe fitting
- diversity factor
- diverting valve
- do
- domestic
- domestic hot water
- domestic water coil
- doors
- Doppler effect
- double-acting compressor
- double-bundle condenser
- double-check valve backflow preventer
- double-contact freezer
- double-detector check backflow preventer
- double-pipe condenser
- double-pipe heat exchanger
- double-pole switch
- double-riser suction line
- double-seated valve
- double-suction compressor
- double-throw switch
- double-wall heat exchanger
- doudle break
- doudle-acting compressor
- doudle-bundle condenser
- doudle-contact freezer
- doudle-flow water cooling tower
- doudle-line break
- doudle-pipe condenser
- doudle-pipe heat exchanger
- doudle-pole switch
- doudle-seated valve
- doudle-suction compressor
- doudle-suction riser
- doudle-throw switch
- down-feed heating system
- downfeed system
- downflow-type central furnace
- draft
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