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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