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maybe i could input my 2 cents here...since iwork mostly with ventilation system

to increase the performance, maybe u should install a board just in front of the fan face intake.... as illustrated in this diagram :


the board should be sturdy enough so it can withstand the pressure... the distance x shouldnt be that wide...maybe less than 2-3 inches will do...

so that the air flow will be from the top and bottom (but u can also design the air to flow from bottom, top, left n right)...

since flowrate, Q is equal to velocity of air x Area of opening, or Q = VA , by introducing the wall/board it will served as baffle thus reducing the area of the opening... from the equation, if A is reduced, Q is also reduced (constant velocity)...thus Q of the fan will also reduced... Q=cfm... and since Q is reduced, low rate cfm fan can be still produced best result... this is simple innovation i just found out...

i hope u understand this simple maths... dont want sound like in science class

my 2 cents

Zaidi

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although i understand the logic, the concern comes in with the baffle and the location of the fan....wheres the filter?

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Quoted Text

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maybe i could input my 2 cents here...since iwork mostly with ventilation system

to increase the performance, maybe u should install a board just in front of the fan face intake.... as illustrated in this diagram :


the board should be sturdy enough so it can withstand the pressure... the distance x shouldnt be that wide...maybe less than 2-3 inches will do...

so that the air flow will be from the top and bottom (but u can also design the air to flow from bottom, top, left n right)...

since flowrate, Q is equal to velocity of air x Area of opening, or Q = VA , by introducing the wall/board it will served as baffle thus reducing the area of the opening... from the equation, if A is reduced, Q is also reduced (constant velocity)...thus Q of the fan will also reduced... Q=cfm... and since Q is reduced, low rate cfm fan can be still produced best result... this is simple innovation i just found out...

i hope u understand this simple maths... dont want sound like in science class

my 2 cents

Zaidi

---

although i understand the logic, the concern comes in with the baffle and the location of the fan....wheres the filter?

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Hi there....this is a good question...

when come to filter, normally i dont put any filter since i will vented them out ... i have a long duct work and goes out to the window and went up to the roof...

but in my original design, i put a thin membrane filter in front of the fan, just to protect the fan or to avoid any paint to accumulate on the fan blade... but after i modify some arrangement, i dont think i need the filter..
and mind u having a filter will increase the air friction inside the booth...

in industrial practice, filter is used to collect the contaminants and to protect the fan blade. In our case, the contaminants are merely paints aerosols and thinner.. IMHO a filter is still not really needed ..
but since many of us doesnt not have the luxury to vent them out, then u will need a good absorbent filter...

can u rephrase your question about the baffle... and the location of the fan....

i will try my best to answer it...

anyway, that's only my simplified version of this lecture.... i wont go too far with the calculation...

but feel free to throw me a question...maybe it can be useful for my research in this field.

Quoted Text

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Quoted Text

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Quoted Text

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maybe i could input my 2 cents here...since iwork mostly with ventilation system

to increase the performance, maybe u should install a board just in front of the fan face intake.... as illustrated in this diagram :


the board should be sturdy enough so it can withstand the pressure... the distance x shouldnt be that wide...maybe less than 2-3 inches will do...

so that the air flow will be from the top and bottom (but u can also design the air to flow from bottom, top, left n right)...

since flowrate, Q is equal to velocity of air x Area of opening, or Q = VA , by introducing the wall/board it will served as baffle thus reducing the area of the opening... from the equation, if A is reduced, Q is also reduced (constant velocity)...thus Q of the fan will also reduced... Q=cfm... and since Q is reduced, low rate cfm fan can be still produced best result... this is simple innovation i just found out...

i hope u understand this simple maths... dont want sound like in science class

my 2 cents

Zaidi

---

although i understand the logic, the concern comes in with the baffle and the location of the fan....wheres the filter?

---

Hi there....this is a good question...

when come to filter, normally i dont put any filter since i will vented them out ... i have a long duct work and goes out to the window and went up to the roof...

but in my original design, i put a thin membrane filter in front of the fan, just to protect the fan or to avoid any paint to accumulate on the fan blade... but after i modify some arrangement, i dont think i need the filter..
and mind u having a filter will increase the air friction inside the booth...

in industrial practice, filter is used to collect the contaminants and to protect the fan blade. In our case, the contaminants are merely paints aerosols and thinner.. IMHO a filter is still not really needed ..
but since many of us doesnt not have the luxury to vent them out, then u will need a good absorbent filter...

can u rephrase your question about the baffle... and the location of the fan....

i will try my best to answer it...

anyway, that's only my simplified version of this lecture.... i wont go too far with the calculation...

but feel free to throw me a question...maybe it can be useful for my research in this field.

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my main concern would have been what you had addressed. you have to protect the fan from accumulating paint and other dangerous "material"
over time, accumulation can wear them out prematurely just as dust accumulation would on a normal pc fan. not really a huge issue though since they are cheap replacements usually.

my concern would be for those that dont have an outside ventilation duct..
you could do a design such as you have shown with a duct tube going to a filter box where everythign would stops in a form of foam or filter.or filler.
that way, you dont need a filter foreward of the fan and you can really go without a fan or use a membrane and still have it safe to use inside