ventalation for attic.

what type of ventalation setup would i need to use for about 8 vegy stage plants and 8 flowering plants so no one could smell it in my house. if you could send a link to a good vent system id really apprieate it. thx

 

It all depends on how big each of those areas are, and also how high the wattage is on the lights that you use. Generally you wanna replace the air in your grow space atleast 3 times per minute. Different fans have different speeds, which are measured in CFM (CFM = cubic feet per minute).

 

the plants will be under 3 feet, and ill be useing 2 400w hps lamps, and a 400wmh, it will really be just 1 big area with 2 dfiierent farms of weed on different stages.