passive cooling

I'm new here so I apoligize in advance if I'm asking a question already on here but I've looked every where and can't seem to find a solid straight forward answer. I'm setting up my first grow room and can't find any information on cooling a NON sealed grow room. I don't really want to do a...

Most 120 and 133 heatsinks out there are compatible with 50mm fans. These 50mm fans are not as cheep so you have to decide if smaller heatsinks with fan is better or just a bigger heatsink without fan...