機器
air
architecture
background
big
building
cold
commercial
compressor
conditioner
conditioning
construction
cooling
design
duct
electric
equipment
exterior
factory
fan
heat
house
industrial
industry
large
line
many
metal
metallic
modern
outdoor
outside
pipe
pipeline
plant
power
roof
rooftop
row
size
steel
structure
system
technology
temperature
top
tube
vent
ventilation
ventilator