View Full Version : What fan in fume extraction/purification units?

Niklas Bjornestal
06-25-2014, 2:03 PM
Does anyone know what fan it is in fume extraction systems (for example purex alpha 200/400 or BOFA 250/350)

Brian R Cain
06-25-2014, 5:41 PM
A unit far smaller than you'd imagine. A colleague traced something identical to a company selling them in Southampton, England if that's any help. Sorry I can't help more at the moment as I'm on holiday, doing Internet stuff on a kindle, which is worse than useless for anything serious with a search engine.

Niklas Bjornestal
06-26-2014, 1:14 AM
I know they are small, the purex alpha is 140W and the 400 model is 204W.

Jacob Davalos
08-12-2014, 2:56 AM
just wondering if anyone else can chime in on this topic? Not necessarily the exact type but general specs would be great. Power of motor, type of blades or impellers used etc. etc. Better yet, does anyone with any of the fancy filter units have pictures of the blower assembly they would like to share? BOFA, Purex, Fumex, Quatro etc.

Mike Null
08-12-2014, 6:41 AM

Dan Hintz designed a home built system that gets pretty good reviews. It may be of some help.


Jacob Davalos
08-12-2014, 11:31 AM
Hi Mike,

thanks for the reply. I am aware of that thread and many other filter build threads. I got the filter part down, and I have also purchased a Penn State economy DC as my air mover - but I want something small and powerful (and quieter) like can be found in the purpose built laser fume extractors (fumex, purex, quatro etc.). I know the quatro units run twin motors which helps significantly with static pressure. I found the motor they use after scouring the internetz (early into this morning) but I am not sure if the impeller is included in the assembly - if it is not, I would need to find the appropriate impeller.

Kevin Gregerson
08-12-2014, 12:07 PM
Hey Jacob, a couple of my clients have been using the inline blowers with good success in regards to being quiet. They don't have the same static pressure capability, but the CFM is enough to remove the smoke.

Jacob Davalos
08-12-2014, 12:40 PM
Hey Kevin,

I looked into inline blowers, but I am afraid that they do not have enough static pressure capability to attach a full fume extractor build onto it. But then again- this one seems to work just fine and it seems to contradict some popular advice on here on how inline fans cannot handle a filter and how the blower should never be in first contact with air being extracted from the machine.


and here is an instructables on a DIY version.


Kevin Gregerson
08-12-2014, 1:46 PM
It's most certainly a contradiction on standard advice and I tell clients who do it that they'll need to clean it out regularly. But when it's in a lab or similar it works well to keep the sound down.

Mike Audleman
08-12-2014, 2:45 PM

Dan Hintz designed a home built system that gets pretty good reviews. It may be of some help.


Mike, I would be curious to see the original post thats derived from as the blog seems to be missing the links.

The system I am currently using is working but come winter time here in Wisconsin, I don't think I want to pull a negative pressure on the house thus forcing cold outside air in.

I have a blower I can use, or think I can. Its a blower formerly used to inflate a large air water slide I got one year for the granddaughters. The slide didn't last but the blower has :) It puts out a pretty substantial volume of air and is fairly quiet running. I use it off and on when workking on projects outside for a cooling breeze etc.

The things I am missing are the HEPA filter and (hopefully a local source) the charcoal. I am sure the air filter I can work out at Menards or Home Depot.

Oh, and how do you dispose of the used carbon? Is it considered hazardous waste at that point?

Kevin Gregerson
08-12-2014, 3:35 PM
The Carbon syncs, you can refill or replace http://www.tfsi1.com/ check with your local distributor.


Kevin Gregerson
08-12-2014, 3:40 PM
If the goal is to make your own internal filter. I realize they can be a little on the expensive side but the BOFA units I've installed have all been wonderful from a service perspective. I've ran across some running 10 years later. They also typically run quieter than other units and they do a better job on getting rid of the smells that I've seen so far.