It happened again. Cheap 6in duct booster fan, plastic fins, works for a grow or two than after being off for a week or two, never runs again. I left my old fan/filter combo in the small tent for drying, dumb. Have been buying fan/filter from HGT, bought a set up from Gotham for my new tent and it has metal fins and the filter has a reversible flange. Gothams' fan is quiter and works well with the speed controler and is about the same price. I had thought to use a 4in fan/filter combo for drying, tent 60cu ft, 100 cfm and a 6in clip on circulating fan, should be ok. I made a commitment to run the whole grow setup from one 15amp breaker and I think I better start adding up what is pluged in now because I still need to get another bs240uv and a second clip-on fan for the grow tent.