Yeah, would be good, I went looking around your site when I needed one last round and noticed you were doing only 6" and 8". Smaller rooms can easily use 4" with LED's, my current flower room is 4'x9.5'x7' and I use an existing 4" vent hole to exhaust with no issues. Just threw a CMH fixture in there this weekend and even with that all I had to do was crank my incoming cooler air to 1/3 throttle to maintain the temps. CMH increased temps by about 6F with the CMH vs. LED's, pretty well same wattage swap, outdoor temps are hovering in the mid-80's), didn't have to adjust my exhaust at all.