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CSI MasterFormat 23 - Heating, Ventilation, and Air Conditioning (HVAC) 
  AQC Industrieshttp://www.aqc-ind.com/index.html

 
AQC Industries is a leading manufacturer and innovator of The BlueDuct™ underground air duct systems for heating, ventilation and cooling (HVAC). The BlueDuct is the only proven, direct-burial underground duct system made from ultra-durable, advanced HDPE (high-density polyethylene). The products are engineered to protect against corrosion, mold and mildew, radon, rust, water and air leaks. The BlueDuct systems have been installed in thousands of buildings, for over a decade, with trouble-free, long-term performance.

 

  Sterling Custom Sheet Metalhttp://sterlingcustomsheetmetal.com/
Sterling Custom Sheet Metal, INC. is a family owned facility founded in 1982. SCSM specializes in the manufacturing of HVAC products. Providing a vast array of standard pre fab fittings and custom duct work for both commercial and residential requirements. We are extremely proud of our newest product line. “Sterling Best Sealed” register box utilizes a patented process to produce foam injected register boxes and thus eliminating typical insulation methods.