i got a space in the basement under some stairs that is 3 fee high by 2 feet wide by 3 feet long. could i fit one 150 watt hps in there and grow 3 plants, with that height? how many CFM would i need? i am MOST concerned about fan noise.
well lets see...your grow room has 18cft of air volume... then you want to find a the vent fan for your needs? ok then, you'll need a fan that can move the volume of air in your grow room out in 5 mins...so 5cft/m x 18cft= 90 cft/min <---air moved in 5 mins so find vent fan, multiply the cfm by 5 and if it greater than your 90cft/min... by at least a 2:1 ratio on air moved out vs air moved in...but other things give off heat in the garden so make sure the vent fan can handle your temp needs i use a 50cfm fart fan from lowes...not to loud it moves about 3000cft in one hour and 250cft in 5 mins and i have a grow volume of 13cft...and it works great...easy wiring..even had a plug...13$...and the really quiet ones are more and the enviroment stay pretty stable... this is how got my vent needs...