“Duct Guardian” is a sheet ventilation fitting parametric layouts calculator. Calculates HVAC flat (unfolded) sheet development of ducts, rectangle to round transitions, cylinders, cones, elbows, etc.

Some common fittings:  Square to round, Radius branch, Radius offset, Cylinder, Cone:

 

 

 

 

“DG Nest”, without any exaggeration is the best buy True Shape Automatic Nesting software currently on the market.

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