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[Firechaser]

In the top and out the bottom right.

[Scott7m]

In the top and out the bottom right.

6 of one half dozen of the other.  I usually go I'm the bottom n out the top tho, not sure It matters

[RSI]

I prefer in bottom out top because it is easier to get (and keep) the air out. But last time there was a post about this, someone had a big long thing about why it should be in top and out bottom.

I really haven't seen it really make that much of a difference.

[willieG]

i have the exchangers in my plenum with the in and out both at the top so it is easier to get out if i want to clean any dust off it that gets through the filter. has been like that 11 years and i have never had a problem. i think the water is going through so fast that it wont make any difference on heating.

[Firechaser]

Thanks