Table 3 - Maximum Capacity* for Copper Tube in a Low Pressure System of Less than 14 inches wc and Pressure Drop of 0.5 inches wc, CFH.**

Length of
Tube, feet		Outside Diameter of Tube, inches
3/81/25/83/47/81 1/81 3/8
10 24 50 101 176 250 535 963
20 17 34 69 121 172 368 662
30 13 27 56 97 138 295 531
40 11 23 48 83 118 253 455
50 10 21 42 74 105 224 403
60 9.1 19 38 67 95 203 365
70 8.4 17 35 62 87 187 336
80 7.8 16 33 57 81 174 313
90 7.3 15 31 54 76 163 293
100 6.9 14 29 51 72 154 277
125 6.1 13 26 45 64 136 245
150 5.6 11 23 41 58 124 222
175 5.1 11 21 38 53 114 205
200 4.8 10 20 35 50 106 190
250 4.2 8.7 18 31 44 94 169
Notes:
* Includes 20% factor for fittings.
** See Table 7.