New Grower Which filter and Fan on Outake

[Invincible]

hi whats the difference between a 150/300mm and a 150/600mm filter? I have a 1.5m by 1.5m tent and not sure which one to go for? If anybody could help that would be great. thanks

 

[Corgy]

The 15/600 is twice as big, more carbon, more capacity. 600 mm long vs 300 mm