Mobile Downdraft Sanding Table / Assembly Table

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Project by bowtie posted 936 days ago 3893 views 20 times favorited 17 comments Add to Favorites Watch

Last winter I built a cedar strip canoe and decided to build a shop air filtration system. A buddy gave me a used furnace blower large enough to build a downdraft table/assembly table. The filters can be serviced externally. I use 2 16×20 3m filtrete filters with 2 “cheap” prefilters. I used foam weather stripping to seal the filters . I have 4 receptacles on each side, an 8 hour timer and a plug for an extension cord to power the table. One end is open for storage the oposite end has a shopbuilt louver to direct the exhaust.
I was going to drill a plywood top but I had a piece of left over pegboard and it works reasonably well. I use holey non skid shelf liner to hold the wood as I sand. The cabinet is 33w x 49L x 38 H and is built of 1/2 ” plywood. It rolls on 4 casters. Cabinet is sealed with caulking to ensure air is pulled thru filters only. The fan is surprisingly quite and seems to pull in most sanding dust.
I want to build a lightweight torsion box top that I can use for more precise assembly. Thanks for lookin, I’m constantly amazed by projects posted on ljs.

-- bowtie,.....jus passin thru....

17 comments so far

View a1Jim's profile


112008 posts in 2201 days

#1 posted 936 days ago

That’s pretty darn creative.

-- Custom furniture

View bigfish_95008's profile


250 posts in 1727 days

#2 posted 935 days ago

Nice, good working design, I like the angle panels directing air flow to a small slot for pre filters and secondary filtering. Storage for sanding items. I like the idea of a removable torsion top for assembly, dual us roll around.
This is minor, but from an electrical safety standpoint I would have used metal boxes and armored cable. As I say minor, but I work with (sometimes against) EH&S (environment, health & safety) guys all day and sometimes the safety natzy in me comes out.

-- bigfish "I am always doing what I cannot do yet, in order to learn how to do it." Vincent Van Gogh

View HalDougherty's profile


1820 posts in 1861 days

#3 posted 935 days ago

Ok, where’s the photos of your canoe? I’ve always wanted to build one, but never found the time. If I ever build a strongback and the rest of the jigs, I don’t think I can build just one…

-- Hal, Tennessee

View neffcustom's profile


10 posts in 941 days

#4 posted 935 days ago

Nice Design! Great idea using ‘pre-filters’, I’m considering building a shop made air handler, and I’m definitely going to use that! Thanks!

View bowtie's profile


821 posts in 970 days

#5 posted 935 days ago

good point on the wiring i routed and stapled the romex out of the way but your right armored cable would be better. if i built another i would probaly hardwire a 10 gauge extension cord .

-- bowtie,.....jus passin thru....

View bowtie's profile


821 posts in 970 days

#6 posted 935 days ago

i would probaly hardwire a 10 gauge extension cord to power the table.

-- bowtie,.....jus passin thru....

View bowtie's profile


821 posts in 970 days

#7 posted 935 days ago

hal, i will post some canoe pictures soon. i built a 14 ’ than a couple of years later built a 11 footer with the same forms, slightly modified forms and spacing. i still have the forms and would like to build another.

-- bowtie,.....jus passin thru....

View Tokolosi's profile


661 posts in 979 days

#8 posted 935 days ago

Ingenious! Awesome idea!

-- “There is nothing like looking, if you want to find something. You certainly usually find something, if you look, but it is not always quite the something you were after.” ~ JRR Tolkien

View doncutlip's profile


2832 posts in 2180 days

#9 posted 935 days ago

Yes, an awesome table

-- Don, Royersford, PA

View BentheViking's profile


1752 posts in 1188 days

#10 posted 935 days ago

gnarly dude

-- It's made of wood. Real sturdy.--Chubbs Peterson

View millzit's profile


111 posts in 926 days

#11 posted 925 days ago

i can see that being on LJ will increase my desire for things, lots of things… a sanding table for one. hey bowtie, you a chevy fan? where in n bama are you, i live in sewanee,tn?

-- cut that out!

View terryR's profile


3034 posts in 932 days

#12 posted 925 days ago

Love it! Thanks for sharing…I sure need one of these.

Pegboard, huh…simple solution to drilling 5000 holes. very smart…

any idea how many cfm’s you are pulling through the top, or how many horses your motor uses? I wanna copy this build asap!!! <g>

-- tr ...see one, do one, teach one...

View bowtie's profile


821 posts in 970 days

#13 posted 924 days ago

I didn’t see any labels on the motor but its about the size of a 3/4 – 1 hp motor. comparing blower cfms to blowers at work I would estimate about 500cfm. Wish I had more info , it was a gift from a friend who details cars.

-- bowtie,.....jus passin thru....

View DIYaholic's profile


13243 posts in 1299 days

#14 posted 924 days ago

Nice table.

Afew Q’s if you don’t mind.
1)What is the MERV rating of your filtrete filter?
2) How quickly do you need to clean/change out the filters.
3) Were you to build again, would you stay with the blower/filter combo or go with a DC?

I ask because I need a downdraft table. I was going to repurposed a furnace blower, but think I will hook it up to my 2HP HF DC, instead.

-- 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 terryR's profile


3034 posts in 932 days

#15 posted 924 days ago

bowtie, thanks for the info! I’ll start with 400-500cfm on a slightly smaller table…most of the projects I make are small, but dust intensive…gotta build this baby!

thanks, again for sharing…

-- tr ...see one, do one, teach one...

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