REFRIGERANT SWITCH: A Greenheck DGX-P116 Makeup Air Unit. Greenheck Fan Corp. has begun offering direct gas-fired makeup air units with the lower-GWP refrigerant R-454B. (Courtesy of Greenheck Fan ...
To handle increasing enrollment, Lincoln-Way Community High School District, just 40 miles southwest of Chicago, approved the construction of two new 2,500-student high schools. The 414,000-sq-ft ...
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