There are two type of bottom dividers thats the best, but there are some diffrence between us.
Type 1(this is the old version):
and Type 2 (this is the new version)
For air flow both of them colud almost equal airflow rate in all tubes.
But the main differece is in that xsection:
Thats why Type 2 is better. Becuse of different air thicknes between “glasing” and tubes it has higher heat loss!
For top divider I recommend this new ones:
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