Black mark on the Aprilaire Water Panel?

Consumer question:

Manual says that waterpanel must be installed with black mark up. I purchases 3 panels, all of which have black mark on the short side only. Now what? Am I to believe that it doesn’t matter which end is up in the 350?

Aprilaires’ response:

Thank you for contacting us.
The mark should be on the short side indicating the top of the panel.

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