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This is a basic ductulator for sizing rectangular or round ductwork.
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HVAC Tools Pro Professional Tools for HVAC Technicians-R
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The most convenient pipe sizing and pressure drop calculation App.
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Accurate HVAC calculators for duct sizing, PT charts & load calcs. Save time.
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Manual D duct sizing calculator. ASHRAE sizes, friction rate, round/rect.
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Piping Engineering Tools and Information
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Lindab Vent Tools is a collection of useful tools for the ventilation business.
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The most convenient HVAC duct sizing and air pressure drop calculator
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Pocket Pipe Calculator - the fast, easy, dynamic basic pipefitter calculator
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Copeland's online product information for Copeland compressors