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I have built a grow box similar to that advertised by many: A plastic box with holes 2 inches apart drilled at all six sides and 1/4 inch drill bit used (advertised by Willy Myco on YT) and shown here:


[youtube][MEDIA=youtube]zGQok-UnyJE:59[/MEDIA]


I don't understand this concept.


First, the perlite easily falls through the bottom as the holes are pretty wide (6 mm or so) so I had to cover them with micropore tape.


Second, the box does not hold any humidity - even with lots of wet perlire, the box has basically the ambient relative humididty (about 49%) but should be >90% ... and the cake casing is dries quickly.


The PF tek does not mention such issues so I am confused. Some people say I should use a closed box and ventilate it often but some say the FAE (free air exchange) is vital.


Can you please advise?


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