ok so im startin to build my grow box but im stuck on ventilation i want to know the simplest most effective way i was gonna use 2 inline fans the input higher cfm then the exhaust one but im not sure how id go about mounting an inline fan if there is a simpler technique out there please share its gonna be a small 3 plant DWC system using a 400 watt HPS light 15"x45"x7' maybe 6'