First things first, arsenal: 150w mh for veg, 150w hps for flower, 45w led, 2 11l pots, soil atami bio grow mix, nutes atami bcuzz soil a+b, box is 60x60x140, internal fan for air circulation, 150m³/h air extractor with carbon filter for heat dissipation and smell. It's a stealth box so smell and noise treatment are an important topic to me, without the filter extractor worked very loudy, i got used to it in my sleeptime but noticed it was audible at 1 wall/pavement distance even if extractor was inside a closet, so started thinking about noise absorbing panels but after white widow started preflowering in week 4, adding carbon filter both solved the noise problem (much more contained) and smell.
Internally temperature with 150w mh+45w led placet both at 70cm height (half of the box) with proper air extraction and circulation is fixed to 26°, tested 1 day only with fan without extractor and stabilized to 30°, a bit too hot for optimal environment.
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