carbon filter. want size ?

What carbon filter should i get . I want absolute zero smell ! Its a sealed room 15/15 8 high. Its veg only but mother plants. 6 footers can stink. Should I go all out get the biggest or would a medium size one work. Talking g a different e of only a hu dear bucks. From a 1000 cfm unit to the largest 1800 5 foot tall 12 inch flange 100 pounds easily. Is it worth the 100 extra ? What are your opinions

just buying the 1800 big bitch it set me back 220 usually 350 . i had my woman talk with the works there possible show a little who knows how she dresses lol . they enjoyed the eye candy i got a great deal were all happy .

ALWAYS GET THE BIG ONE! Unless you like buying twice( 3x's if you're me )The 3 ft wound work but, the bigger one would work longer.
Mountain air
Phresh
Can
In that order
What ever you do, don't buy the off brand ones