I also run a 2 x 4 x 7 tent and use 2 small Humidifiers to keep up the R.H.
One issue I noticed was that the little humidifiers need to have the exhaust
opening positioned in front of, or away from any fans, Electrical items or any Wood you
may have in the tent, wood will swell and mold if it gets to wet.
I lost like 3 fans before I realized it was the moisture getting into the motor
that caused it to fail. Ended up using some epoxy to glue a funnel on top
of the humidifier THIS WAY I can use another funnel, one size bigger place over
the first funnel. Adding a long plastic tube that fits the top of this 2nd funnel
I can direct the exhaust moisture were ever I need it.
Using 2 funnels I can just push up the top funnel to remove the tank, once filled
I lower the second funnel with the attached tube directed away from fans and such.
A little long, hope Its understandable.