Ultra-Core™ and Dura-Core Difference™
Ultra-Core
![](/images/core/ultra-core.png)
Core Depth | Rows of Tubes | Centers |
1 1/2" | 2 | 1/2" tubes on 3/8" centers |
2" | 3 | 1/2" tubes on 3/8" centers |
2 5/8" | 4 | 1/2" tubes on 3/8" centers |
3 3/8" | 5 | 1/2" tubes on 3/8" centers |
![](/images/core/ctx_half_b.jpg)
* Available with smooth or dimpled tubes
Econo-Core
![](/images/core/econo-core.png)
Core Depth | Rows of Tubes | Centers |
1.296" | 2 | 1/2" tubes on 9/16" centers |
1.972" | 3 | 1/2" tubes on 9/16" centers |
2.658" | 4 | 1/2" tubes on 9/16" centers |
3 3/8" | 5 | 1/2" tubes on 9/16" centers |
![](/images/core/CTX_half_on_half.jpg)
* Available with smooth or dimpled tubes
Dura-Core H
![](/images/core/dura-core-h.png)
Core Depth | Rows of Tubes | Centers |
1 7/8" | 2 | 1/2" tubes on 1/2" centers |
2 1/8" | 3 | 1/2" tubes on 1/2" centers |
2 13/16" | 4 | 1/2" tubes on 1/2" centers |
3 1/2" | 5 | 1/2" tubes on 1/2" centers |
4 3/16" | 6 | 1/2" tubes on 1/2" centers |
4 7/8" | 7 | 1/2" tubes on 1/2" centers |
5 9/16" | 8 | 1/2" tubes on 1/2" centers |
![](/images/core/rb_core_Hstyle.jpg)
* Available with smooth or dimpled tubes
* Louvered or non louvered fin
* Louvered or non louvered fin
Dura-Core N
![](/images/core/dura-core-n.png)
Core Depth | Rows of Tubes | Centers |
1 7/8" | 3 | 1/2" tubes on 5/8" centers |
2 3/8" | 4 | 1/2" tubes on 5/8" centers |
3" | 5 | 1/2" tubes on 5/8" centers |
3 7/16" | 6 | 1/2" tubes on 5/8" centers |
4" | 7 | 1/2" tubes on 5/8" centers |
4 1/2" | 8 | 1/2" tubes on 5/8" centers |
![](/images/core/rb_core_Nstyle.jpg)
* Available with smooth or dimpled tubes
* Louvered or non louvered fin
* Louvered or non louvered fin
Dura-Core I
![](/images/core/dura-core-i.png)
Core Depth | Rows of Tubes | Centers |
1 7/8" | 2 | 1/2" tubes on 1/2" centers |
2 1/8" | 3 | 1/2" tubes on 1/2" centers |
2 13/16" | 4 | 1/2" tubes on 1/2" centers |
3 1/2" | 5 | 1/2" tubes on 1/2" centers |
4 3/16" | 6 | 1/2" tubes on 1/2" centers |
4 7/8" | 7 | 1/2" tubes on 1/2" centers |
5 9/16" | 8 | 1/2" tubes on 1/2" centers |
![](/images/core/H_FF_Inline.jpg)
* Available with smooth or dimpled tubes
* Louvered or non louvered fin
* Louvered or non louvered fin