In 1948, research by R.G. Huebscher established flow resistance for different shapes of ductwork at equal velocities, which allowed the creation of the duct-sizing calculator or “Ductulator” for ...

Design Master HVAC is an AutoCAD-based duct design program. It is a complete design tool, the company states, encompassing load calculations, duct and diffuser layouts, duct sizing, and double-line ...

Performing electrical cable heating calculations can be a cumbersome task, but they’re essential to accurately determining the allowable ampacity of an underground electrical duct bank installation.

To support homeowners considering larger upgrades, Four Seasons Heating and Air notes that qualifying projects may be ...