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HVAC Formulae - ThermalNetics Humidification = CFM x (Grf‐Gri) / 1,555 lbs/hr. CFM = l/s x 2.12. Air Pressure Drop (in. wg) = Pa / 249. Water Side. Q = USGPM x (ti ‐ tf) x 500 Btuh. Q = USGPM ...

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