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I picked up one of these for my new, under construction....., shop:



To my dismay the manual provides no guidance as to proper placement beyond indicating that you don't really want to place this unit exhausting against a wall..... What I had hoped to find was some direction regarding proper placement to maximize the efficiency of the unit and what air patterns would be advisable in this respect. But nothing - nada.....

So my question is, at least one of them, Do I want this centrally located on the ceiling of my shop? Or can it be toward the back and a few feet from the back wall? Also, I have already installed a 100CFM exhaust fan that will vent my smelly stuff....... outside:



Here is a shot of my shop's ceiling. For those of you who have these Jet or JDS units did you do anything to spread the weight of the unit over more then 2 floor joists? Perhaps a couple of 2 X 4's spanning 4 joists? Also did you use the eye bolts of the metal brackets and in either case what hardware i.e. lag bolts, bolts, chains, etc. did you use.

And lastly has anyone used any elastomeric vibration isolators to help reduce the possibility of the ceiling becoming a sound board?



Many thanks!

JET has an 800 number with reasonably knowledgeable people who might offer suggestions.

Hesh,

Mine just hangs from two 2 x 6 rafters. It's only about 40 lbs, so not to worry. You might need to use some 2x to span the joists if the spacing doesn't line up with the mounting holes. I used the stuff that came with it, plus some screw hooks from Ace HW and chain master links, the ones you use to connect two ends of a chain.

As for efficiency, it looks like the room you'll have it in is small enough that it will exchange the air quickly enough, no matter where you put it. Just pay attention to where the exhaust will blow. I would want it away from the vent.

Also, I've heard some people put it down closer to the level of the power tools and benchtops where the dust is generated to clear the air faster, but I don't think it would make that much difference.

The sound is more of a whooshing than a hum, so it seems unlikely that it would resonate at the frequency of the ceiling. You could just turn it on and hold it up to the ceiling as a rough check.

You're gettin' there!

Pat

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formerly known around here as burbank
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http://www.patfosterguitars.com

I've got one of those too and I've learned a couple of things.

First, the best mounting point is near the floor as dust will settle. I've still got mine hanging from the ceiling and it does work pretty well.

Second, on the higher settings the sides vibrate like mad and make it really loud. To solve this, I took a nylon web tie down type of thingy and wrapped it tightly around the unit. i then took two rags and rolled them up into little cylinders and stuck it under the tie down. This has made the unit usable on the med. and high settings.

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http://www.birkonium.com CNC Products for Luthiers
http://banduramaker.blogspot.com

I've got the JDS version in my garage. Plenty of headroom so it's hanging almost in the middle of the space with the intake facing my workbench. I used 3/8" eye bolts screwed through my sheetrocked ceiling into the joists. S hooks connect the unit to the eyebolts. I have finished space above the garage and haven't noticed much transfer of noise. I think it helps that the unit is suspended rather than mounted directly against the ceiling. Full speed is louder than my fein shop vac, but not too bad.

Hesh, I mounted my JDS to the joists using eye bolts. I don't experience any vibration. I hope you got the remote - real handy!

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A higher purpose for wood.
Rich Smith
Issaquah, WA

Hesh, in the book Setting Up Shop by Sandor Nagyszalanczy (glad I don't have to sign that on my checks), he suggests locating the unit along a longer wall in your shop with the intake side approx 1/3 of the length of the wall from one end. If you can position some of your dust creating operations near it, it will help the filtration unit's efficiency.

He suggests that this positioning aids in circulation of air about the shop, creating a flow of air. He also notes you should size your AFU so that it filters the cubic feet of air in your shop 6 to 8 times in an hour.

Mine is a homemade one that weighs a metric buttload. It's out of MDF. I used hooks in the ceiling, chains in the eyebolts of the unit and then hung it on the hooks. However, mine were not the manufactured joists like that.

Hope this is helpful.

Darrin

Hesh, one other thing that is a cool nicety to have along with this. If you rig up a timer system to the AFU, you can leave it on for an hour or so after you leave the shop to allow it to filter more of the suspended particles. Just a set-up like the timer on your bending blanket.

Darrin

Hesh;
No shavings or dust on the walls & floor!!!!
Are you sure your making guitars?????

Tiny dust -the most dangerous floats everywhere-heavy particles of course land on everything!
I'd put it where the tiny ones float!!!!!

Any Braz. dust in that shop??
mike

Wear a dust mask-get a PSA test-opps~~~

Mike

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Mike Collins

I read the same information as Darrin, and it makes sense to me as an engineer, so that's where I mounted mine- about 1/3 of the way along one of the long walls, with the intake facing the nearer end wall. I mounted mine about 1 foot above head level, over a workbench, and the outside surface is about 1 foot out from the wall. The idea is to create a circular rotation of the air in the room, to most efficiently clear the entire volume. I put two 2x4's across 3 or 4 joists, then hung the unit by chains hung from eye-bolts into the 2x4's. I put aluminum caribiners onto the bottom ends of the chains, to easily attach them to the unit, since I was lifting it up by myself. It's only about 40 lbs, but very bulky when you're on the top of a stepladder...

As far as transmitting noise into the joists, I don't have any living space above it, so I can't comment. I think suspending it from chains is going to make for very inefficient transmission of vibration into the floor. I'd try it without any rubber in the system first, probably just an non-required complication.

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Gene

Politicians and diapers must be changed often, and for the same reason- Mark Twain