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