hvac unit on top of building . medium view

abandoned aged air airconditioning blower boiler building chiller cold commercial compressor condenser conditioner conditioning control cooling damper deface defaced defacement derelect drum equipment exchange exchanger factory fan furnace graffiti heat heating hvac industrial industry intake medium metal old outside pipe pipes plant pump roof rooftop rtu rust rusted rusting rusty scaffolding supply system top unit variable ventilation view volume warming weathered worn