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The SMACNA Duct System Calculator has detailed instructions and calculations to enable HVAC system designers to design an average duct system witho...

Now you can easily compute fixture unit load values for drainage and vent piping. This calculator has been updated to the 2018 Uniform Plumbing Code.

This 2018 calculator is based on Table 6.5 of the Uniform Plumbing Code (UPC) and helps compute water fixture units (WSFU) and Minimum. It has been...

This calculator is used for sizing pipe systems carrying natural gas of 0.60 specific gravity at approximately eight (8) inches water column pressu...