Free to try (Output text randomly changed to 'Design Master'); $840.00 to buy
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From Design Master Software:
Design Master HVAC is an integrated HVAC building design and drafting package for AutoCAD. It aids you in the layout, sizing, and drafting of ductwork in both 2D and 3D. Duct sizing is done automatically. Building loads are calculated in Design Master using the ASHRAE CLTD method. Version 6.0 improved load calculations.