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My Long Wait for a Workshop #5: Home Made Air Filter

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Blog entry by JWags posted 1185 days ago 7431 reads 15 times favorited 12 comments Add to Favorites Watch
« Part 4: Slowly But Surely... Part 5 of My Long Wait for a Workshop series no next part

Hello again,

Just finished my homemade shop air filter. I had to change my original plans, which were to hang it from the ceiling. That’s because I also wanted a washable filter, to keep down on the ongoing costs. So here was the final criteria: I needed a blower that would draw and push at least 800 CFm, a primary filter that would catch up to 5 microns, and a secondary filter that would catch 1 micron particles, and not be cost prohibitive. Plus – it had to be quiet.

So – I’m lucky – I’m in the real estate business, and have to regularly deal with HVAC people, plumbers, electricians, etc.

I put the word out to the HVAC people that I was looking for a take out blower and cage – in good working condition – hopefully with several speed selections. Lo an behold – one showed up not 8 days later – from a home that was being remodeled using in-floor radiant heat. Yipee – step one…

The 1 micron washable filter I found at Grizzly (http://www.grizzly.com/products/1-Micron-Washable-Secondary-Filter-G9956-/H2451 if you’re interested). I live at almost 9,000 feet – the air is already thin – so I really wanted good filtration. But this filter changed the configuration – it needed 18 inches to work. I wasn’t going to hang a coffin sized box from the ceiling, so I decided to build a roll around filter. Make it 1/4th less tall than my tablesaw, so it could double as an infeed table, and make it sturdy enough to put my future surface planer on. Kill 3 birds….

So I had to horizontally mount the blower. This would require some support for the side opposite the mounting holes.

So dowels with rubber tips seemed like a good candidate.

And I think I found a simple solution to dampen the motor vibration – I mounted it over some rubber hose:

So here is the blower configuration:

Now I needed intake holes:

and here’s a pic of the bottom – it should stay where I put it:

I didn’t want the exhaust too close to the intake, so I side mounted some floor registers. I’m also not glueing the back or top so I have future access to the guts if maintenance is needed.

So here is the semi-final assembly:

and from the back:

And after a coat or 2 of paint (Grizzly colored of course – lol), here it is finished:

It’s very very quiet, and rolls around easy (I put a big handle in back…). I just finished using it as an infeed table for my TS (I’m ripping out the parts to finish Norm’s workshop Hutch…). The primary filter is already showing signs of dust, after only about 15 minutes of operation.

I think my lungs are gonna thank me! And thanks to you for reading!

-- James - I don't like jogging - the ice pops out of my glass...



12 comments so far

View Will Stokes's profile

Will Stokes

261 posts in 1952 days


#1 posted 1185 days ago

Nicely done! I could use one of these.

View dbhost's profile

dbhost

5378 posts in 1830 days


#2 posted 1185 days ago

Very interesting design. Most of them I have seen are straight through pull arrangments, first time I have seen the box stacked like this.

-- My workshop blog can be found at http://daves-workshop.blogspot.com

View JWags's profile

JWags

54 posts in 1259 days


#3 posted 1185 days ago

Thanks Will -

dbhost – This desgin was an attempt to make the best use of space in my very small shop. If I can make something that has dual or triple use or purpose – all the better. Thanks!

-- James - I don't like jogging - the ice pops out of my glass...

View Grandpa's profile

Grandpa

3046 posts in 1273 days


#4 posted 1185 days ago

Great job. This looks really good! IS the blower working okay positioned like this? I thought someone was having a problem with noise the other day day and another writer said to turn the blower where the shaft was horizontal. This looks good and if it works that is even better. Thanks for posting. Does it draw in the smell of those pine needles?????

View JWags's profile

JWags

54 posts in 1259 days


#5 posted 1185 days ago

Grampa – LOL
It WILL suck in pine smell – as soon as it’s warm enough to open the window!

The blower seems to work fine in this position. NO vibration or any nosie (rubbing etc.). I do think mounting on rubber helped a lot.

Thanks for the kind words…

-- James - I don't like jogging - the ice pops out of my glass...

View Grandpa's profile

Grandpa

3046 posts in 1273 days


#6 posted 1185 days ago

Thanks for the post and thanks for the information. I was curious about the mounting and the noise if there was any. This is great. We have been in the lower 90’s a few times this year already (SW Oklahoma). I smell pine needles everytime I ready your blog and look out your shop window.

View DIYaholic's profile

DIYaholic

12898 posts in 1273 days


#7 posted 1185 days ago

My shop air cleaner is currently being designed in SketchUp (I need the practice). I’m planning a dual purpose design. 1) Run of the mill air cleaner. 2) Fresh air blower for Paint/Finishing room. I will be building a plastic tent/room within a room. I will have an attachment for the clean air exhaust that will provide positive pressure into the “plastic tent”. The benefits will be two fold; 1)isolating the motor from combustible fumes and 2) prevent dust from contaminating the finish.

After seeing your dual purpose cleaner, I may make mine a tri-purpose machine by making it either an infeed/outfeed table or a stand for planer/bench tools.

Thanks for posting your air cleaner, it has given me food for thought regarding the design of mine.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View gfadvm's profile

gfadvm

10551 posts in 1288 days


#8 posted 1185 days ago

What a great build! It looks like it was purchased from Grizzly! I love the multipurpose idea. Im probably going to steal this idea.Thanks for posting it.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View bigike's profile

bigike

4031 posts in 1886 days


#9 posted 1185 days ago

great job.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View JWags's profile

JWags

54 posts in 1259 days


#10 posted 1184 days ago

Thanks again eeryone for the comments!

Randy – I’d love to see your Sketchup about this. I really hafta learn that system.
gfadm – Steal away – I’d like it if you posted yours – especially if you improved it.

-- James - I don't like jogging - the ice pops out of my glass...

View patron's profile

patron

12955 posts in 1939 days


#11 posted 1184 days ago

great work there james

i too wanted to build my own
but couldn’t find a fan for it
so i bought a HF unit and winged it

http://lumberjocks.com/patron/blog/22831

here are custom (and standard) filters i did find

here is electrostatic air filters
hose wash
last a lifetime
1 to 3 micron filtering
buy once
last forever

http://www.air-filter-exchange.org/Maximum-Allergy-Relief-1-Electrostatic-Filters-Std-Sizes-Afe-1.aspx

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View rodman40's profile

rodman40

157 posts in 925 days


#12 posted 83 days ago

Hi James, Nice work on the air filter, I have some questions about the wiring setup 1- does it run on 220 volts or 120 volts 2-do you have 3 speeds or just one 3-what size wiring is the motor 4-do you have a timer, I want to build a filter for my shop and need the info so I can start, I bought the blower units from a guy but he had cut the wires as close to the motor connections as possible. he said they were out of 220 air conditioners. Thanks in advance, rodman

-- Rodman

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