Temperature – Multiplier 150° -1.0 130° -.68 110° -.42 120° -.54 100° -.32 140° -.82 No. 9A Base-Ray® I=B=R Ratings – Steam and Hot Water (500 LBS/HR Flow Rate **) Length in Lineal Feet* Steam Rating Square Feet Steam Rating B.T.U. Per Hr. At 215°F 230°F HOT WATER RATINGS IN BTU PER HOUR AT 500 LBS./HR. (ONE G.P.M.) FLOW RATE** AT AVERAGE WAER TEMPERATURE OF 220°F 210°F 200°F 190°F 180°F 170°F 150°F Pressure Drop in Inches of Water*** Per Lin. Ft. 3.40 820 890 830 770 710 650 590 520 390 1.5 5.1