<span class="link_user">@Davidot</span>, i've coupled 2 150mm pc fans together. Put 1 of these in the hole of the roof for extraction and the other in the hole of the bottom for intraction.
There is no filter.
<span class="link_user">@Blacksheep</span>, i'm at day 50 of flowering and i can already harvest (80% cloudy, 10% amber and 10% not ready) but i will wait some more days for get more amber one :grin: buds are rocks for me also. Waiting to see your harvest online:wink: