abandoned
air
building
circulation
collector
concrete
construction
corridor
danger
dark
deep
dirty
duct
ducting
ductwork
dwelling
engineering
exploring
factory
habitation
heat
heating
heating duct
heating network
homeless
industrial
industry
inside
line
main
metal
mystery
passage
pipe
pipeline
power
round
rusty
sewer
steel
subterranean
system
technical
temperature
tube
tunnel
underground
urban
ventilation
warm
定額
Round concrete underground tunnel of heating duct system with rusty pipes.の素材 [FY310121652312]
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