how to lower RH

lights on 45% RH light off 65% RH in week 8 of 12/12

did not think the 65% RH with lights off was to big a deal untill now so put my outtake on full with the passive open to stop to much negative pressure but then at a certain time of day i need to close the passive as i use the same room to do my next shoots so the light in the room will be on there under a 250 hps so have to stay in this room and once i close the passive intake the negative pressure is strong even with my 4inch intake fan on !

question is how best to reduce this the RH that is ! any ideas peeps ?

get a dehumidifier, my rh jumps in all my rooms when lights are off and all my rooms are sealed. Only way I have found it to run one

My local store had nice small ones for cheap that just hang on the wall. Basically filled with silica beads that suck it up. You take it out and plug it in to dry the beads and re-hang it. Depends on how big of an area your trying to dry.

Really and truly I didn't think 65% RH was all that bad how much air cirrculation do you have in your space?

PapaSmoke81 said:

Really and truly I didn't think 65% RH was all that bad how much air cirrculation do you have in your space?

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sory for the l8 reply man just had to take one of my girls out for culling so av been busy with her,, to ur question of air circulation yes i av excelent air circ so all good there, put a heater in the room oil radiator got it down to 55% and 45%lights on so all good now, now i av low temps to deal with coz of my intake and its getting cold over uk side of the atlantic so will av to turn it off on lights out as it dropped to 63 f yesterday so will turn off intake will get some negative pressure in my tent but it shud be all good ! peace !