Smacna duct system calculator metricthis calculator complete with detailed instructions enables hvac system designers to design an average duct system without additional references the only calculator in the industry to include the 0 0003 ro. For all ducts between the supply fan and variable volume control boxes and 1 250 pa w g. Also both options have been shown so as to provide this manual as a quick reference to smacna standards. 
				
			
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