HVAC Chart 3 Pack, R-22 Superheat Subcooling Calculator, R-410a Superheat Subcooling Calculator and Duct Calculator
- 3 Slide charts for less that some sellers charge for 1!.
- #1 Training tools used by College, Universities and Training Centers.
- Field proven by installers and technicians for over 30 years!.
- No abridged information or rule of thumb calculations..
- Duct calculator has diagrams for properly calculating total equivalent length and pressure drop correction factors. A must have for high efficiency systems..