So I'm planning to purchase a CNC plasma table for my metal fabrication shop, and I need to know a few details in order to budget for the installation of the unit.
Firstly, as I have decided on going for a downdraft table to clear the relatively small shop of toxic fumes, I am faced with two options: Fume extraction without any filters to the roof of the building or a filtered fume extractor that re-circulates the filtered air back into the shop.
I'd rather go extract directly out of the workshop as that will be the cheaper solution on the long run as I will not have to be constantly facing the inevitable filter change.
That being said, does anyone have any idea how long these filters last? I know it's almost impossible to say with any amount of certainty so lets take a worst case scenario of 8 hours/day of cutting aluminum sheets with a thickness of 20mm.
Also, are plasma cutting fumes hot? The reason I ask is so that I can price the ducting work accordingly. Might have to insulate the pipes from heat to prevent any potential skin burns.
Finally, if I decide to go for the fume extraction on the roof method, can I reduce the ducting diameter if it goes straight up for about 10 meters? My plasma table has an airflow requirement of 3500 m3/h and the outlet diameter is 310 mm. Will it be ok to reduce that directly to say 200 mm and go up from there?
drummerdimitri
- drummerdimitri
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Joined:Sun Oct 04, 2020 7:57 am
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Location:Beirut, Lebanon
The smoke has a lot of particles that I think will clog up filters fast. It also creates a lot of Carbon monoxide that will set off detectors real fast. I think it would be best to dump directly outside your shop instead of filtration. I'm also getting ready to set up a cnc table, and will definitely be ducting outside my garage while drawing in fresh air.
I see alot of tables setup with a waterbath underneath, not sure if that's all there is too it, perhaps there's a smoke extraction ring around the table like a indoor bbq restaurant has built into the tables.
Might be something to look into since water is cheap and would catch the particles
Might be something to look into since water is cheap and would catch the particles