Large industrial air conditioning (HVAC) units and ductwork resting on a rooftop under a bright, partly cloudy sky. The image shows maintenance access walkways and the weathered metal railing of a com图片
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Large industrial air conditioning (HVAC) units and ductwork resting on a rooftop under a bright, partly cloudy sky. The image shows maintenance access walkways and the weathered metal railing of a com
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