what kind what it? known brand or not? also i have a almost same amount of cubic feet im making a veg and a flower room one is 7x5x8 other is 4x5x8 im more concern on the bigger one due to being flower

should i power 2 individual fans one per room or have one fan exhaust both rooms ?

sorry for hijacking
gus738 Reviewed by gus738 on . Carbon Filter: How many CFM's ? I'm looking for a carbon filter for my 8" inline exhaust fan which put's out 675 CFM's but I'm not sure what kind of carbon filter rating I should be looking at? I found some priced at $150 that says 240 CFM's Then another set $200 for 750 CFM's For $50.00 I'm sure the 750 CFM's is probably the way to go ? But why? Any advice would be great. Rating: 5