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Blackout systems solve one production problem and create three more: heat buildup, humidity spikes, and airflow restriction. A proper Cannabis Light Deprivation Ventilation Guide starts there, because once curtains close, the room or greenhouse behaves like a sealed heat and moisture box. If the ventilation design does not account for static pressure, light traps, crop transpiration, and staged exhaust control, plant stress shows up fast in temperature swings, VPD drift, condensation, and diseas …