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Round to Oval Conversion Chart - RigiDuct® |
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Equivalent Round Diameters for Oval RigiDuct® |
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RigiDuct® Size for Specifying |
Spigot End NOTE: Add 1" to dimensions to determine bell end measurements |
Equivalent Round Diameter (I.D.) |
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| A | B | ||||||
| inches | mm | inches | cm | inches | cm | inches | mm |
| 14 | 355 | 17.125 | 44 | 09.125 | 23 | 12.500 | 320 |
| 16 | 405 | 19.750 | 50 | 10.875 | 28 | 15.125 | 385 |
| 18 | 460 | 22.500 | 57 | 11.125 | 28 | 16.500 | 420 |
| 20 | 510 | 26.500 | 67 | 12.000 | 31 | 19.125 | 490 |
| 22 | 560 | 28.750 | 73 | 14.250 | 36 | 21.125 | 540 |
| 24 | 610 | 30.000 | 76 | 16.000 | 41 | 22.500 | 570 |
| 30 | 760 | 36.500 | 93 | 20.500 | 52 | 28.100 | 715 |
| 36 | 915 | 43.000 | 109 | 26.000 | 66 | 34.375 | 875 |
| 42 | 1,070 | 51.000 | 130 | 28.000 | 71 | 39.250 | 1,000 |
| 45 | 1,145 | 54.000 | 137 | 32.500 | 83 | 43.125 | 1,095 |
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