I use the same set up as well. When you use adapters to convert for a 4" fan and filter, you add more than 10" for each one. That makes for a light unit just over 4 ft long. Way big and bulky for me! I felt it was a must to use a smaller cfm(210) fan because the 6" is WAAAY too much for a cabinet so a McGyver session was in order. I used some EPMD rubber seal from Lowes and a set of tool box latches to attatch the filter to the tube. The fan is alot more challenging because there are no flat surfaces for the latches so I just put the gasket on the fan, put a hose clamp on the tube to attatch S hooks to and used a stout wire to cinch the fan to the S hooks. This works well for now until I finish this run and come up with a feasable solution. I leave the whole unit mounted almost to the ceiling and just stack buckets on other buckets to bring plants to the light. This also makes for easy inspection of plant undersides and any other accessability issues. The pics are not the best but...