421 W/m²·K = 74.1424 BTU/hr·ft²·°F
| W/m²·K | BTU/hr·ft²·°F |
|---|---|
| 406 W/m²·K | 71.5008 |
| 411 W/m²·K | 72.3813 |
| 416 W/m²·K | 73.2619 |
| 421 | 74.1424 |
| 426 W/m²·K | 75.023 |
| 431 W/m²·K | 75.9035 |
| 436 W/m²·K | 76.7841 |
421 W/m²·K = 74.1424 BTU/hr·ft²·°F
1 W/(m²·K) = 0.176110 BTU/(hr·ft²·°F) · 1 BTU/(hr·ft²·°F) = 5.67826 W/(m²·K)