I have a tight grow space. I recently bought a used 1000w hps on a whim and now realize it has 4 inch duct vents. Would you guys recommend getting a 6 inch fan and adaptor or will a 4 inch 200 cfm fan be adequate. I would worry the adapter will constrict air flow enough to cause excessive noise. Ps, I plan on buying a vent fan NOT an inline fan booster. Any advice?