After posting a few pictures of my grow, I got a load of request on how I mounted my axial fans. I only use small fans in my clone room, but the need to be light proof is the same as my main grow room.
Here are the two fans mounted in my clone room:
The tough part in plumbing any fan/blower, is finding a sturdy flange that fits. I was able to make a flange for most sizes of axial fans (called PC fans by many) out of PVC drain grates. Lowes and Homedepot have loads of them in all shapes and sizes. Because of the wide range of pipe diameters, they had to make a grate to fit most of them.
I am showing the basic stuff you will need to make a working flange. Depending on your needs, you can improve on the construction.
This is a 4" square grate from Lowes (that is a "2*" on the top of sticker).
I used a white 3" elbow. I found its much better to find a black one if possible. I had to paint the inside of that elbow to light proof it. This grate can fit four pipe sizes.
Slelect a grate that fits your fan. Place your fan on top of the grate and drill out the four holes. Use a drill bit at the same size as the mounting holes in the fan.
I like to install the bolts through the holes as they are drilled. It makes it easy to line up holes.
If you need max air flow, then you might want to cut out the spokes. You can leave them in as well. Just about any cutter or small saw can help remove the spokes. I used the hole saw.
Hard part is done. Now lets make a mess. Seal your fan to the grate with some silicone by putting a bead along the outside edge of the grate. Install your fan to the grate and tighten the four bolts. Whipe off all excess silicone.
You can attach your flange to your elbow with PVC glue, but that stuff is strong and you wont be able to save your flange if you need to make adjustments. I just use silicone. It will allow me to rotate the elbow if needed
Now your ready to install your assembly into your grow room's plumbing. Every grow is different, so I can't tell you how to plumb it through your wall. I just used a male adapter fitting stuck through the hole in the other side of the box. Time to smoke a fatty and marvel at your genius.
I hope this has added to your options when it comes to mounting a blower or fan. I have seen grates that will fit large blowers at a fraction of the price of the hydro store.
Now to attach it to the wall:
For a thick wall of more then 2", just cut a piece of 4" PVC pipe about 2" longer then the thickness of your wall. Drill your wall so your pipe fits snug to the hole. Place your pipe through the wall, allowing an inch or so to hang out on each side. Glue an elbow on to each side, pushing the elbows against the wall while the glue dries. Calk or silicone any gaps.
For a thin wall made of wood. Drill your hole so the small end of a 4" male adapter (no threads) fits through snug. Stick the male adapter through the wall and glue an elbow onto the other side. Calk any gaps.
Some pictures below might help explain it better:
Or like this:
Edited by Rumpleforeskin, 03 August 2014 - 09:09 PM.