Check out LED site: growitled.com this guy has some great stuff

You might be able to go from 4" to 3" and then bush down from 3" to the 2".

My components are metal vacuum tubing, maybe look at muffler pipe at JC Whitney or something comparable. One thing I failded to mention is I had to put a glass lense cover in my light hood for the small fan to vent properly.
Hempsouth Reviewed by Hempsouth on . Venting Using 2" PVC? My first post here. Love this site. Tons of great info. I've spent the past couple of weeks reading and searching to pick up knowledge. I see a lot of posts here that could be answered with a simple search. I believing in doing homework before asking questions! That said, here is my case. I'm looking for a little help setting up my grow room. Here is what I've got. Basement set up. Good climate control all year round. Ready access to electric and H20. Lockable and away from all utilities Rating: 5