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Do you think running so that the static air pressure in the room (jungle) would affect the standard VPD numbers on a chart. I don’t actually do VPD on purpose, it just seems to happen by accident that the best number is achieved by running 4 HLG 550s and a dehumidifier in the room. The vacuum is enough that no air can seem through exterior walls, and a cloth i have covering the room door gets pulled in.

It would seem that this would change the VPD numbers.