We have written before that round spiral duct should be your first choice for a rooftop HVAC duct system. The round shape reduces snow accumulation and accelerates rain runoff compared to rectangular ...
Lindab Inc. published a revised “Duct Leakage White Paper” in November 2009. Here are some of the highlights of that report. Air duct leakage should be a concern to both the design engineer and the ...
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