Air flow is overrated. Holding humidity is much more important. As long as you don't have stagnant, wet conditions constantly, and aren't growing mold you should be fine. Opening up the enclosure every day for maintenance, feeding, handling etc is plenty to refresh air. Many closed chamber designs for reptiles that require ultra high humidity have very minimal airflow.
However, to keep humidity around 50-60% for BPs you shouldn't need to cover more than about 3/4 of the vents to achieve humidity, depending on your geographic location.
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