Skimmer Air Question

[Wsufan18]

I just finished building cabinet/folding table around my 150g sump located in the laundry room. This cabinet was built to eliminate noise from pumps etc. and to make my wife happy by hiding the sump. After putting the countertops on, I've noticed that my skimmer isn't pulling like it used to, and I am making continuous adjustments to it. Does this have to do with the fact that the intake air is now warmer, more humid air? Do I need to install a airline to the skimmer from outside?
All help truly appreciated!

 

[Wsufan18]

Pics of sump cabinets

 

[slief]

My guess is that it could be due to high humidy in the air in the enclosed cabinet or air restriction. If the air is really humid under the cabinet which would be expectable in an enclosed space with a sump in it, some air would could be displaced by water vapor resulting is less air into the skimmer. If the cabinets are fairly air tight, you could also be restricting air flow into the skimmer. Could you extend the venturi line outside the cabinet as a test and see if your skimmer becomes more stable?

 

[Wsufan18]

Cabinets are not air tight but humidity is high.
No air movement whatsoever since it is in a small laundry room.
Should I install an exhaust fan to take air out of room, or install small fan inside cabinet to remove humidity via tapping dryer vent line? A damper would be utilized to keep dryer vent air from cabinet. Or outside air line to skimmer and exhaust fan in room? Or.......

 

[Wsufan18]

Slief, before cabinet the skimmer worked great. I will leave the cabinet doors open until a plan is made.

 

[slief]

Slief, before cabinet the skimmer worked great. I will leave the cabinet doors open until a plan is made.

You definitely will want some sort of an exhaust fan so the humidity doesn't cause damage or mold to the walls inside the cabinet. Like I said, for the skimmer issue, I would extend the air intake by adding a length of tubing outside the cabinet but leaving the doors open will certainly help.