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A home high efficiency furnace with a residential gas water heater & humidifier.

Round concrete underground tunnel of heating duct system with rusty pipes

repair refrigerator job with pressure gauge , technician vacuum system refrigerator at maintenance shop.

Inside old red brick tube with ladder

Old pipes with valves

rusty ductwork on street

Old steel fume extractor

New attic windows in old living house roof

Old factory ventilation system