ashif
Member
Quick question. My grow cab is 2x2x3. I have a 150w HPS with 6" cool tube. I built a DIY carbon filter using the chicken wire, activate carbon, carbon furnace filter and pantyhose. It is 4" around(fits 4" ducting) and about 13" long. I want a fan i can use to pull air through cool tube and through the carbon filter. What size would I use? 2 more questions; I know I am going to need a 6" to 4" reducer at some point so I can hook the cool tube to the filter, should I place it before or after the fan( meaning use a 4" or a 6" fan)? 2nd: will a passive air intake be enough or should I use a 4" in 80cfm inline fan I already have as intake? Any quick help would be appreciated as I already have the light installed and the filter built. This grow has literally been built as it goes and I am 6 weeks into veg on my 19"x19", one plant screen.