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If the resistance of the return air duct is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation. Unitary Products Group 9 173858-YIM-A-0306 TABLE 6: D1EB036 SUPERHEAT CHARGING (IMPERIAL) OUTDOOR TEMPERATURE SUPERHEAT AT COMPRESSOR SUCTION (°F) AIRFLOW = 1,300 CFM INDOOR WB TEMPERATURE (°F) 55 57 59 61 63 65 67 69 71 73 75 65 21.1 21.6 22.1 22.7 23.2 23.8 24.3 25.3 26.4 26.9 27.4 70 19.5 20.0 20.6 21.1 21.7 22.2 22.8 24.0 25.1 25.7 26.3 75 17.9 18.5 1