unit - vapo
- unit
- unit control panel
- unit cooler
- unit heater
- unit of voltampere reactive power
- unit point selector
- unit ventilator
- unitary air conditioner
- unitary refrigerating system
- unitary spot air conditioner
- unloaded start
- unshrouded impeller
- unsteady state
- upfeed system
- upflow-type central furnace
- upright bucket steam trap
- upright freezer
- usage load
- use factor
- useful latent air conditioner capacity
- useful refrigerating effect
- useful sensible air conditioner capacity
- useful total air conditioner capacity
- utilization factor
- UV radiation
- V-coil evaporator
- VA
- vacuum
- vacuum breaking
- vacuum chilling
- vacuum cooling
- vacuum cracking
- vacuum diffusion pump
- vacuum freezing
- vacuum gage
- vacuum insulation
- vacuum pump
- vacuum test
- validity
- valve
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