Hi Grasscity! Just a quick question here: I have a grow tent with only one 6 inch vent and the rest are 4 inches. I have a 6 inch cool tube HPS and a 6 inch fan. I know people scorn against duct reducers but it looks like the only option. Would it be ok if I used a 6 in to 4 in duct reducer on the other side of the cool tube for the output vent for heat? Thank you for your time Grasscity!