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what CFM fan will sufficently cool an air cooled tube 400 hps to reduce heat, im sure it will be larger cfm than the standard exhuast fan equation (cubic feet / 5)

Hi everyone, longtime reader, first time posting. i have some experience indoors in hydro, but am now trying to master outdoor in soil as nature intended.first my set up: - 1 chem 4 og (cali connection seeds) mother is grown indoors as a bonsai mother in deep water culture hydro under a cfl...