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Electrostatic filter
- Thread starter afa13
- Start date
hmmm. loaded question. It has been awhile since I worked on this type of questions so I may step WAY out of bounds here. However I am sure I will be corrected by the talented posts on this forum.
I used to (a long time ago in a galaxy far far away) design ventilaiton systems for full smoking casinos.
Outside of the organic issues that I believe that some electrostatic filters can remove they were essentially very high efficiency particulate air filters than could remove bad stuff w/ limted air pressure drop... albeit w/ some electrical energy used for the 'ionization'. They essentially charge air particles zipping thru them one way or another and cause them to collect somewhere, either a plate or in some mfgrs they use coagaulation where the charged particles become "bigger" and get picked up by a standard high efficieny air filter. Keep in mind outside of carbon filter (help me here guys) you CAN NOT get rid of gases w/ any particulate or ionizaition filter. You need dilution to take care of this.
Once the federal/state smoking ban went into affect in public buildings this work I was doing went away. So I now do windows.
I probalby missed your question but I hope not. .......
I used to (a long time ago in a galaxy far far away) design ventilaiton systems for full smoking casinos.
Outside of the organic issues that I believe that some electrostatic filters can remove they were essentially very high efficiency particulate air filters than could remove bad stuff w/ limted air pressure drop... albeit w/ some electrical energy used for the 'ionization'. They essentially charge air particles zipping thru them one way or another and cause them to collect somewhere, either a plate or in some mfgrs they use coagaulation where the charged particles become "bigger" and get picked up by a standard high efficieny air filter. Keep in mind outside of carbon filter (help me here guys) you CAN NOT get rid of gases w/ any particulate or ionizaition filter. You need dilution to take care of this.
Once the federal/state smoking ban went into affect in public buildings this work I was doing went away. So I now do windows.
I probalby missed your question but I hope not. .......
- Thread starter
- #4
@11241
lol .. at least u tried answering it...thank u for explaining how it works...but i need to know the criteria or how to judge if a certain electrostatic filter is acceptable for the job by just looking at its technical sheet... the use of the filter will be at a commercial kitchen for a university... any ideas?
lol .. at least u tried answering it...thank u for explaining how it works...but i need to know the criteria or how to judge if a certain electrostatic filter is acceptable for the job by just looking at its technical sheet... the use of the filter will be at a commercial kitchen for a university... any ideas?
I'll try to put IRstuff's question another way:
Does the information in the filter's technical data meet or exceed the specifications for the job?
I would add: eng-tips members are not going to write specifications for you. The mechanical engineer who designed and specified the kitchen exhaust and makeup air for your particular job should have listed the data that must be met for the filter in question.
If your installation was not designed by an engineer, you need to go back one step and have that design done before hiring contractors and ordering equipment. That engineer needs to be familiar with your local codes and ordinances, and with the requirements for air quality and fire prevention in your location.
Good on ya,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
Does the information in the filter's technical data meet or exceed the specifications for the job?
I would add: eng-tips members are not going to write specifications for you. The mechanical engineer who designed and specified the kitchen exhaust and makeup air for your particular job should have listed the data that must be met for the filter in question.
If your installation was not designed by an engineer, you need to go back one step and have that design done before hiring contractors and ordering equipment. That engineer needs to be familiar with your local codes and ordinances, and with the requirements for air quality and fire prevention in your location.
Good on ya,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
- Thread starter
- #7
well no i dun want u to list me specs...i'm just asking what r the criteria i should base my judgement whether the filter is acceptable or not...i think i should take into account the particles' size, power rating and the hood's exhaust flow and then decide whether the manufacturer is an approved one and then give my decision.... i.e. i should've analyzed it as i do for any other filter... PEACE OUT!
trashcanman
Mechanical
As per NFPA 96, all filters in a grease duct shall be UL listed for that purpose. See if the data sheet for the filter states that. If not, find a filter that is listed for that service. I have yet to see an electrostatic filter for grease ducts. NFPA 96 prohibits mesh type filters.
- Thread starter
- #9
trashcanman
Mechanical
Don't know about free download, but you can go to the NFPA website and view the code online. Take notes and copy the whole thing by hand or screen capture.
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