I have a fan connected to the Carbon Filter with ducting then more ducting from the other side to push the hot air out. I have no fresh circulation apart from when i open the doors. I think I will drill some holes like you suggested. Or should I fit another fan to blow cool air in. I have a small desk fan just to motion the plants. But as I said earler its COOKING aargh. The last lot died. Any suggestions welcome al try put a pic of my set up so you can look and see what you think. :rastasmoke:then bed! Night. Thanks. TOKE ON!