VentCalc Pro

VentCalc Pro is a professional HVAC and ventilation engineering calculator for mechanical engineers, building designers, and HVAC technicians. Accurately size ductwork, calculate airflow, and analyze ventilation systems with ease. KEY FEATURES: • Duct sizing (round & rectangular) • Airflow & velocity calculator • Pressure drop in duct systems • Fan power & efficiency • Air changes per hour (ACH) • Psychrometric calculations • Outdoor air requirement (ASHRAE 62.1) Perfect for HVAC designers, mechanical engineers, building officials, and engineering students. All calculations are performed locally — no internet connection required.