DUCT!

The simplest and quickest ductulator app there is Ever wished you had your classic slide ductulator with you on-site, in a meeting or at your desk? Now you can. DUCT features: Simple and quick to use - just drag your finger up and down HVAC ductwork sizing using the equal friction loss (pressure drop) Huebscher equation method and a maximum velocity Designed for architects, mechanical engineering consultants and HVAC contractors See all available equivalent rectangular sizes like the original ductulator Suitable for mechanical ventilation, exhaust, supply, cooling fan vent duct plus general air conditioning and heating duct design