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Thread: Wall Mounted Dust Extraction Fan
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9th February 2022, 02:01 PM #1Novice
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Wall Mounted Dust Extraction Fan
Hi,
I have a small shed approx 65c/m, using a cnc, drill press, blasting cabinet, orbital sander. I have a small 2 stage vacuum/cyclone set up using 40mm hose, it catches most stuff at the source but there is always the fine airborn.
After a bit of reading/searching, and this thread Shed Ventilation from BobL,
I'm tossing up between these 2,
12 INCH DUCT FAN Inline Centrifugal Exhaust Ventilation Heavy Duty Fan Blower | eBay
x2(Two) 146mm 220V Double Inlet Centrifugal Blower Fan DYF 4E-146-QS2a, NEW | eBay
Any input appreciated
Cheers
Mitch
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9th February 2022 02:01 PM # ADSGoogle Adsense Advertisement
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9th February 2022, 02:34 PM #2Senior Member
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I'll be interested on seeing what you end up with, i've been looking at my options over the last few weeks, and i have 3 options.
Utilise my Felder AF16 with the 1 micron filter and build a suction wall box with AC hinged ducted grille screens, but the Dusty plus out close to 98 db.
Buy a dust extraction filter from Hare and Forbes (has Centrifugal Fan, with two filters)
Build a dust extraction filter with the Centrifugal blower fan or VEVOR Ventilation Extractor Exhaust Fan Blower 12''/300mm 150W Air Blower Silent | VEVOR AU, along with hinged AC ducted grille with various filter grades
The issue i have is that i have is i can't duct it out of my industrial workshop, so i have to make sure the filters are getting down to 1 micron.
I use my dusty and also my festool vac while using tools and machinery, but that fine dust has been etching itself into the paint on my camper that i store in there.
the easiest option i think for me is to just pick up a hare and forbes unit, as the filters are reasonably priced, already has a timer and remote and is a lot less noise than using the dusty as a air filtration unit
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9th February 2022, 02:54 PM #3.
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Either fan will do the job but you might want to consider the following.
The first one (Centrifugal fan) is cheaper to buy but uses 246W compared to the Squirrel cage fan (85W) so the latter will be cheaper to run.
The Centrifugal one claims 1100 m^3/Hr.
At 65 cubic m that works out to 17 room air changes per hour
The squirrel cage is 830 m^3/hr, or ~13 room air changes per hour
Neither figures are probably absolutely accurate but the Centrifugal one should still move more air.
Noise wise they are about the same( 54 v 55 db) but squirrel cage fans are usually quieter.
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9th February 2022, 05:31 PM #4Novice
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9th February 2022, 05:33 PM #5Novice
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The Vevor looks very loud!.....is this what your talking about from H&F....W325 - AF-400 Two Stage Air Filtration Unit | Hare & Forbes Machineryhouse
I'll be using this to cool my shed too, as when the vacuum, cnc and compressor are going it's like an oven
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9th February 2022, 06:07 PM #6.
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The Vevor fan Ad is contradictory. In one part it says ultra-quiet 50dB operation, while another says 68-72 dB.
As it's an axial fan these always make a lot of noise when they move air so it's probably going to be even louder than the second figure.
I seriously doubt it will move the claimed 2850 m^3/hr.
These measurement are usually made by measuring the air speed meter in front of the fan and multiplying it by the fan area.
BUT
The flow through the fan is seriously constricted by the grille, and the fan blades themselves so they end up using an area value that is much larger than it is in practice to mathematically generate a false air flow rate.
This is pretty common and over estimates of a factor if 2X or more are not uncommon.
To perform the flow test accurately one needs a long test pipe in front of the fan and the air speed across the radius of the pipe needs to measure in multiple places. This takes a lot of time and is why most commercial flow rates are just wrong.
Testduct.jpg
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10th February 2022, 09:08 AM #7Senior Member
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Yeah after looking more into it, BobL is right about the higher noise levels with the Vevor fan. no one wants to put up with that noise level.
The model i was looking at is the W326 - AP-12 Two Stage Air Filtration Unit | Hare & Forbes Machineryhouse as i have a bigger area, But only because i can't vent directly outside.
If you can, pumping that fine dust straight outside is better and you don't require filters. don't forget to check out Gumtree for single phase blowers, you might be able to pick up a larger single phase unit.
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10th February 2022, 09:12 AM #8Senior Member
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11th February 2022, 02:53 PM #9Senior Member
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Quote; 'Noise wise they are about the same( 54 v 55 db) but squirrel cage fans are usually quieter.'
Are those actual or claimed figures? I have one of the centrifigal fans and it sounds like a jet engine. Measures 60db on my phone app. at 2m.
I have another radial kitchen type fan that measures 56db at 2m. surprisingly both together only measure 62db.
The DE with one outlet open is 63db and with the 2 fans is only 64db
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11th February 2022, 04:01 PM #10.
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Claimed.
I have one of the centrifigal fans and it sounds like a jet engine. Measures 60db on my phone app. at 2m.
I have another radial kitchen type fan that measures 56db at 2m. surprisingly both together only measure 62db.The DE with one outlet open is 63db and with the 2 fans is only 64db
Sound pressure levels don't combined by simple addition,
If you have two sources of equal sound intensity close together, both together will only produce about 3dB more that either one.
The formula for addition of two SPLs is
SPLTotal = 10·LOG10[10SPL1/10 + 10SPL2/10 + 10SPL3/10 ... + 10SPLN/10] (dB)
There are a couple of web based calculators that will do the maths for you
eg Logarithmic Addition of Sound Pressure Levels | WKC Group
The kitchen fan (56 dB) Plus teh centrifugal fan ( 60 dB) should produce 61.5 dB at 2m, your measured 62 dB is pretty close
63 plus 62 should produce 65.5 dB . Discrepancies could be due to differences in distances between sound sources
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11th February 2022, 05:24 PM #11Novice
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Squirrel fan ordered....should get next week.....will update this post at that time.....thanks everyone for the input
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11th February 2022, 06:18 PM #12SENIOR MEMBER
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11th February 2022, 06:36 PM #13.
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11th February 2022, 07:00 PM #14SENIOR MEMBER
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11th February 2022, 08:21 PM #15.
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Yep that's correct. If you have two equal noisy machines and let's say both produce SPLs of 60 dB @ 2m when either one alone is turned on . Then if both machines are more or less side by side and turned on the total SPL 2m away will be 63 dB.
Same applies if they are both 100 dB or 50 dB.
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