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Dust collector outdoors5/8
I am planning our new shop and would like some extra filtration on our dust collector.
My first thought was to build a room next to our production area just for the collector and put some pleated filters in the wall between them.
I was told this is not allowed as it puts the collector in too small an area and would be an explosion hazard.
So my question is, Can I build a small closed off shed OUTSIDE for the collector and have ductwork for the air coming back in the building and use some pleated filters on that? Or is this basically the same thing.
Thanks for your thoughts!
Why do this?
1. Add Extra filtration of pleated filters after the main dust collector.
2. Reduce noise in main production area.
Your local regulations will kick into high gear if you ask local officials. That is always the trouble with outside collectors that they may see.
Depending on where you put the ducting and cyclone, your dust collection system can act as a return air cooler in the winter, and a return air heater in the summer. I worked in a shop that was heated and cooled by the return air at the exact wrong times. However, the space may be worth the heating and air conditioning bills.
This is exactly why I want to have the air returned. the shed would be insulated so the return air would also return the heated air in the winter. The door could be left open in the summer so no air would be returned.
While it always nice to hear comment I still don’t have any real answer as to whether this is legal.
I am pretty sure the fire marshal where the new shop will be located would allow it. For no other reason than he just doesn’t know it would not be allowed.
I am looking to find out if there is a safety reason for not doing it.
I am going to install inside at this time just to be safe.
No one here will give you an answer to your query as to the legality of what you would like to do. Anyway, it is the internet, so how far do you want to trust that?
Your idea is sound. I have my current small shop with a shavings shed 5' x 5' x 8' attached to the shop, with the fan and motor and cyclone above it in the gable. It is all air tight and insulated. The return air hits a filter plenum and then goes out thru the filter sleeves - 9 @ 6" diameter 6' long - and it is not affected by its trip, temperature-wise.
The shavings bin or room must be air tight, as well as all the duct and fittings, for this to work. The plans and equipment are all from Oneida, and the system has run since 1993 without a problem. It really performs well.
Legal? I never asked, and no one ever asked me. Insurance, firemen, cops, and City people all know where I am and what I do and will even visit. Never a question.
Thanks for your response. If Oneida came up with that design, that's pretty strong credentials. They are pretty conservative.
Thanks for the info!
It really depends on your local authority, if it gets involved. As I recall,NFPA code calls for dust collectors over 5000 cfm to be located outdoors and to have spark detection and an abort gate- that gets expensive real fast, and I have never actually seen such a setup in this rural area.
When I was researching a new central system for the shop I used to work for , we had an industrial air handling outfit give us a quote of about $80k for a system in the 6,000 cfm range with all the bells and whistles I mentioned plus diffusers for return air. Using Oneida components and our labor it would have been more like $30-35k as I recall, but the Oneida engineer insisted that the NFPA didn't require the extra safety components that the other outfit recommended. (The project never happened because of the 2009 crash, but that's another story.)
The bottom line is that a high volume system returning air into the shop can be a massive fire accelerator. If the fire marshal is a stickler you may be better off with a couple of smaller systems.
Both S-750 and S-1000 are under 5000cfm and could be located inside under regs.
By the way I have heard from the Felder rep that some states have upped the 5000cmf requirements for indoor. Last we spoke he thought NC ware we are located was one of them.
The Felder collector is awesome. Super quiet and extra filtration. The only problem is the way the dust is stored. Too low capacity for us. We would be emptying 2 to 3 times a day.
We have 9,000 and 6,600 cfm systems located outside dropping into trailers and returning air to shop. We get annual fire department inspections and our insurance carrier inspects also. Neither has said anything about them. Both have blowout panels. Building is sprinklered.