40 replies to this topic

[MurCurY]

Ok...getting around to asssembling a flowhood. I will be doing this on my desk. I have a bunch of plexi i salvaged from a store display...one piece being the bottom so i can sanitize regularly withouth distroying the surface of my desk. Here is the hepa i'm going to use...

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[python]

IMO it is better to buy professional quality

[MurCurY]

how much is a professional quality flowhood?...several hundred dollars right?
this cost me a whopping $10...with new filters.

[xxanxx]

Not sure about that filter

Do you have a blower?

[Hippie3]

i do not think that filter is up to the job

[MurCurY]

i'm actually going to use the fan and housing as a housing for the new filters i'm going to buy.

[Hippie3]

ic
how powerful is the blower ?
cfm ?

[xxanxx]

I would think that blower isn't powerful enough. I would just start on Ebay or something, 1200 cfm blower for $95

[tobynutz]

hey everyone, i wanna make a flowhood but i dont wanna order a blower. what sort of things would have a blower in them that i could strip out and use for a flowhood.

[llamabox]

The blower in a furnace is the one normally used.

[tobynutz]

would that be something i could find at like a junkyard or something? or am i better off just buying one lol

[HaiLeY]

I have seen a centrifugal type fan used as well, the kind used to connect round ducting to in hydro ventilation, or in heat transfer setups.

[spacecowboy]

Acution, salvage stores/junkyard would be a good place to start, or try callin round to the local Heat n Cooling shops n ask them where you can find a used squirrel cage blower cheap. Not sure on the size you need, but I think that may be based on the filter. Still figuring out the lil details on mine.

[Horus XCIII]

What on earth could you be needing a flowhood for :) Hope you aren't up to anyting naughty!

Synthesis II covers how to make a simple fumehood, but the other suggestions here are good to. And the old rhodium archives have some still-working links about building a vacuum pump (no idea what you're cooking, but a water aspirator usually won't cut it).

[tobynutz]

maybe once i am free from a couple bills i will invest in building a nice one from new parts. i love building stuff and having one of these bad boys would make my life a heck of a lot easier in the long run.

[the jesus]

I don't know if you've seen this, but Buckaroo's got a good "ghetto" design http://mycotopia.net...read.php?t=6707

[tobynutz]

i hadnt seen that before, thanks. i think i will order my hepa from that link there. they have good prices. can anyone tell me what size blower i will need for a 12x24 hepa? i think around 495cfm but im not sure. if i do decide to make one i will make a pictorial of the construction process for everyone.

[the jesus]

Glad to help. Everyone should have The Banzai Institute bookmarked IMO.:bow:

[spacecowboy]

I don't know if you've seen this, but Buckaroo's got a good "ghetto" design http://mycotopia.net...read.php?t=6707

http://www.filtera-b...a.htm#99.99wood

Darn those are great prices, wish I had come across that link before I ordered my 24x24x6...it cost me lil over $200 at a local heating n cooling shop.

Here is a great link I got from AntiC which gives details/pictorial of building a flowhood from scratch:

heres what I did with a HEPA
ya might find it helpful
it shows a way to measure static pressure also
the rating on the filter about WG means that anywhere up to that measurement the filter will hold its filtration percentage rating. If you go over that pressure you could damage the filter and blow contams right through it.
BUT thankfully the fans from residential a/c equipment that we comonly use are not capable of developing that much static pressure without cavitating. They typicaly develop about .5 inches WG.
It takes a LARGE fan to push an inch of static.
http://mycotopia.net...html?1105308871

[Horus XCIII]

ooops, sorry about that, I misread "flowhood" as "fumehood" <smacks forehead> Such is the price of smoking a bowl while reading here.