In The Grow Shops Ive Been In They Will Set U Up, With A Blower, Most Have A Little System Demo Running...
What I Know, From Reflector To Duct, Duct To Blower, Exhaust From Blower To Carb. Filter, Carb Filter To Out Doors, Or Attic...it Is Really Simple, Grow Shops Cant Wait To Help...your Size And Needs Really Depend On Size Of System And How Many ,fm U Want To Move "foot Of Air Per Min." Hope This Helps, Maybe Check The Grow Room Set Ups In The Gallery....dbb.
Anyway This Should Put U At Top Of List, See If We Cant Get A Better Answer...