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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?

<blockquote data-quote="blue.magic" data-source="post: 3812391" data-attributes="member: 35184">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&#039;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 &gt;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?</blockquote>

[QUOTE="blue.magic, post: 3812391, member: 35184"] 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? [/QUOTE]