I'm planning to vent two tents (both approx. 1m2, maybe one of them will be 1,2 x 1,2 m) with one exhaust going into chimney. Was thinking to have separated fan and filter for each tent and connecting them with duct and wye duct which after would go into chimney. Does it make sense? Or would you have some better ideas? Is it enough that I would intake air from room (open window?) or should I bring air directly from outside? I also have dilemma about possible contamination between these tents and disturbing each other in light cycles. Forgive me my english, I'm not a native. Will appreciate any input.