Im just posting this because there's not a lot of information on fume extraction options out there for your average everyday guy trying to not die of ass cancer from his hobby or side hustle. I will give a bullet point listing of cost at the end.
My shop is divided into 2 bays that each have their own extraction system (I have my welding table in one bay and the other bay is mostly used for small part fab and working on trailers and vehicles). Total shop size is around 1500sqft with 10ft ceilings. I did straight runs of metal ductwork vented through the wall in about 20-25ft lengths.
Okay, first off, I really... REALLY considered an all in 1 filter unit but I didnt want to be wheeling that thing around from bay to bay and paying for filter replacements BUT if I was welding in a small(ish) area, like a garage, I would absolutely just buy one of the filter units and stick it in the corner and make it work. Obviously I have 2 bays and 2 separate units, you can cut the cost in half if you just need 1 unit.
So, I finally finished the remodel of my entire shop and the fume extraction is finally complete and I can share the real-world cost of what it took to add it, in a semi-professional manner, to my shop.
The first thing I learned was that fume extraction arms usually need 13-15ft ceilings to articulate properly, ChatGPT does NOT tell you that information, nor does the product description on virtually any website. Its buried in the user manual, which I only figured out by doing a final spec check before placing my order from FumeDogg. If I had tall ceilings, FumeDogg would get my vote for the most bang for your buck product and Id have their system in my shop right now, but I have stupid short little ceilings, so I had to order from a company called Plymovent. They are the only extraction arm company that makes a low ceiling arm, Lincoln used to but no longer does.
Plymovent actually makes a fantastic product, I couldnt be happier with their quality... but they're also 3x the cost of FumeDogg. I ordered the Plymovent Ultraflex Low Ceiling model. Its a 13ft articulating arm that works with 9ft ceilings and still gives a 6ft person proper clearance to walk around without banging their head. Their sales staff is helpful but will only answer the questions that you ask them, they do NOT offer extra information. For example; I asked about their low ceiling product line, they sent me every shred of information I could ever hope to know about the LC offerings, we finalized my invoice and then I thought to myself "I better make sure they are going to send me everything I need to mount it to the wall". Well, come to find out, there was zero mounting options included with my quote, they're just like that, you have to think of everything you need and ask them for it, they will not offer it to you preemptively. They also do not include or arrange shipping, the customer has to arrange their own shipping... this was significantly more of a pain in the ass than I would have ever thought.
The extraction fans are supposed to pull 2400CFM and Plymovent offers their own extraction fans for $$$$. I thought to myself, "Why pay $800 for their stupid fans when Harbor Freight offers 2400CFM fans for $99". DO NOT DO THIS. I wasted so much time and money setting up my system with the harbor freight fans. They work, but only at about 1/3rd of the capacity theyre supposed to. I bought an anemometer and my best reading at the head of the extractor was 900CFM, after I got the proper fans my best reading was 2700CFM, DO NOT SKIMP ON THE FANS. If you're doing a jerry rigged extraction system with a very short run, itll work fine, but it will NOT work for a moderate run. It has some bullshit to do with pulling air through a tube and physics and voodoo, idk.
Plymovent also wants you to order a bunch of shit to go with their fans to protect the fan motor called a Motor Protection Switch, and a Motor Control Box (to turn it on/off), which adds about $2000 to the cost (for two). I had my electrician wire 2 20 amp 120V plugs in my ceiling and then wire them to on/off switches next to my work area and I just went to Lowes and bought a heavy duty 120V pigtail electric cord and used ChatGPT to walk me through how to wire it to the motor, it took 20 minutes and works great and saved me a stack of cash.
You also absolutely need a fresh air intake, either an open door or windows, these fans will suck the air out of a room in a heartbeat and you need to replace it with fresh air. My shop has a minisplit in each bay so I dont want to just open the door. I took one of the Harbor Freight fans and mounted it as a fresh air intake, when I flip one of my extractors on, I flip the intake on to replace the air thats being sucked out with fresh air.
Okay, cost breakdown for TWO units-
Extraction arms - $3700 + tax + $1200 shipping (they fucked me on the shipping and shipped Fedex priority because I didnt explicitly tell them to ship it economy. Choose freight shipping, its much cheaper)
Fans $1700 + tax + $350 shipping. I ordered the fans after the arms and shipped via freight
Electrician wiring 20amp 120V plugs in the ceiling + switches, $800
Duct work is hard to price because I had to redo a lot of it because it was originally 8" but the new fans work off of 6". A safe guess is $325-$375.
Misc purchases like electric cords, connectors, etc, $125
Harbor freight fresh air intake fan + exterior shroud and silver tape $150
Redoing everything to switch from HF extractions fans to Plymovent $400
So, there you have it. I just wanted to put some more information out in the world for those that want to get fume extraction set up in their own shop