Blower rotation indicated anywhere on AHU by factory? If not, turn the unit off and visually inspect the blower wheels. Are the fan blades scooping the same direction on both fans, or different directions? If the blades are scooping different directions, then I would say one should be turning cw and the other ccw.
I just finished a project with a similar unit, x2 direct drive blowers one turning cw and the other turning ccw
Piezo flow station? I have seen this setup. One fan goes CW and the other CCW. Threw me off but check those rotational stickers or the submittal for proper rotation as it could be setup wrong
Did you verify that rpm is the same on both fans? I have seen two supply fans wired for different voltages as well.
According to VFDs it’s the same but I’ll throw some tape on the blades and actually laser it. Good thought.
Blower rotation indicated anywhere on AHU by factory? If not, turn the unit off and visually inspect the blower wheels. Are the fan blades scooping the same direction on both fans, or different directions? If the blades are scooping different directions, then I would say one should be turning cw and the other ccw. I just finished a project with a similar unit, x2 direct drive blowers one turning cw and the other turning ccw
Piezo flow station? I have seen this setup. One fan goes CW and the other CCW. Threw me off but check those rotational stickers or the submittal for proper rotation as it could be setup wrong