Mark1
SMF Supporter
Don’t forget to stick the hose out of the window MarkI just stick on my ppe and good to go!View attachment 477547
Sticking your hose out of the window can upset the neighbours and get your name on a special register!!Don’t forget to stick the hose out of the window Mark
Nice to feel special thoughSticking your hose out of the window can upset the neighbours and get your name on a special register!!
Agree with everything written regarding carbon filters. I operated ours in a clean room environment so atmospheric contamination would have been far better controlled, leading to better operational life cycles. I never took that into account.
I would also say that it’s your lungs, you protect them as you see fit. I’ve just typed this up as it may be of interest to some.
Those particulate filter change times are simply outrageous. To me that means one of two things. Either the filters are not correctly sized so they are quickly overloaded, or (cynical view) the company has decided that overselling consumables is a way to supplement income.
A HEPA filter is not a sieve (common misconception), it is a maze. I attended several (five I think) courses run by Pall filtration in the course of my Pharmaceutical production career, and they used very good graphics illustrating this concept.
To summarise, the depth of filtration material to be crossed is what makes a particulate filter effective. The particles drawn in by the air have to navigate labyrinthine pathways as the air crosses the matrix, and eventually, due to the many changes of direction they are subject to, become impacted on the filter wall and are removed from the airstream. As more particles are impacted, the “maze” becomes more involved, so removing particles more effectively.
There are three ways you can get particulate breakthrough in this type of application. The first is mechanical failure of the filter matrix. The second is by the contaminant challenge at one time being too great for the filtration matrix’s ability to remove particulates, and the third is that the challenge partials are too fine for the filter to remove them all so they are carried through on the airstream. The first is eliminated by use of quality components. The others are eliminated by utilising a HEPA filter that has been appropriately sized for the task in hand.
With use a HEPA filter becomes more effective at its primary task, removing particulates. However, as it becomes more efficient at removing particulates, the airflow velocity drops off until it is lower than an effective threshold so rendering the filtration device ineffective. This is when the filter needs to be replaced.
Here’s some background.……My reasons for attending these filtration courses was to enable me to fully understand the concepts involved in worker protection and the design, installation, testing, and maintenance of bio containment equipment. This equipment included protected powder discharge systems and biological laminar flow safety cabinets.
These systems were velocity airflow tested daily, and smoke tested (particulate challenge) at three monthly intervals. No HEPA in my experience had a life of less than two years, and most of these systems ran 24/7/365. I realise that nobody on this forum has the ability to do this at home, but it is the most reliable measurement of filtration efficacy. If you do want to investigate this further, airspeed velocity meters are cheaply available on Amazon…..
However, my experience and knowledge tells me that In infrequent home use a filter in this sort of application should have a much greater life than two months……the HEPA should easily outlast the carbon filter.
LOL yes, it’s not cheap but, for me unable to wear a mask and using lacquer based paint, it’s a worthwhile expense!All very good reading this and lots learned and more to be learnt. Dashed off to find where and for how much a Benchvent 300SD could be purchased.
WHAT? HOW MUCH?! Darn and gosh. Plus the Danish VAT then the import duties.... I need to lay down.
That booth is only 208cfm??? That’s some pretty mediocre airflow for the price.All very good reading this and lots learned and more to be learnt. Dashed off to find where and for how much a Benchvent 300SD could be purchased.
WHAT? HOW MUCH?! Darn and gosh. Plus the Danish VAT then the import duties.... I need to lay down.
Quality can be subjective. A measured airflow rating is not. That booth flows less than a $180 Amazon unit. But hey, it’s better than no booth at all I guess.The airflow is more than adequate for any airbrush work I will do. It's like so many things in life - "If you want something and can afford it then buy it. If it's not what you want or you can't afford it then don't buy it". For example are Wingnut Wings kits worth the high cost? Some modellers say 'yes' some say 'no'.
That’s not a measured airflow (mass flow) though Colin, it’s just a total volume measurement. Mass flow is measured in mass/time units, usually Kg/s.Quality can be subjective. A measured airflow rating is not. That booth flows less than a $180 Amazon unit. But hey, it’s better than no booth at all I guess.
I don't understand what all the facts and figures mean but I can't find that figure in the specifications. All I can find is something which says ..That booth is only 208cfm???
Model No. | Fan Motor * Spec. | Air Volume at Free Air | Ave. Air Velocity at Filter Face | Ave. Air Velocity at Hood Face | Noise Level LAeq dB(A) |
---|---|---|---|---|---|
BV300S-D | 230V 50Hz 105W | 355 m3/hr | 0.60m/sec | 0.55m/sec | 58 |
208cfm or cubic foot per minute is about 353m3 per hourThat booth is only 208cfm??? That’s some pretty mediocre airflow for the price.
Another way to look at it is this:208cfm or cubic foot per minute is about 353m3 per hour
If you leave the windows and door shut that would pull up your carpet LOL….I’ve seen an extract fan pull the plasterboard off the walls in a clean room when the inlet fan failed, by the wayI have been looking at this one:
Sou ds OK but 'only' 9m3 per minute lol that's 504 m3 per hour. I think that should be up to a bit of over spray.Airbrush sprøjtekabine E550 - Airbrushshop Danmark
Airbrush sprøjtekabine E550 med LED lys i god kvalitet. Komplet med motor, filter, 220V/12V omformer, udsugningskit og drejeplade. Kabinen kan nemt foldes sammen. 9 m³/Min. L56.0 x W48.0 x H36 cm. 5.5 kg.airbrush-shop.dk
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