making a flowhood [merged]
Posted 28 April 2005 - 02:25 AM
In searching for a blower for the hood the only place I can find that sells squirrel cage blowers new, online, is www.grainger.com, but they are charging much more than I can afford for a motor/blower setup. Is there any place else (other than good ol' Ebay) where I can find a moter/blower at a better price? Anybody got an extra one lying around?
What size HEPA filters do those of you with flowhoods have? I am thinking of going with either a 12"x12" or a 12"x24". Will the 12"x"12" be absolutely too small? Also, does the thickness of the HEPA filter matter? (they make them in 6" and 11" thicknesses)
Does it make a difference whether or not I mount the prefilter in the box right behind the HEPA, or outside of the box, on the blower? How often do you have to change your pre-filters? Thanks in advance for your wisdom.
Posted 28 April 2005 - 05:50 AM
12" x 24"
What size HEPA filters do those of you with flowhoods have?
12" x 24" seems to be the standard.
Will the 12"x"12" be absolutely too small?
it may well be possible to get away with just a 12" x 12"
but unless you're really cramped for space
i don't think it's worth the risk.
6" will be sufficient.
Also, does the thickness of the HEPA filter matter? (they make them in 6" and 11" thicknesses)
the hepa i use has only 2" of hepa material (!)
but it is different in design to the usual hepas i see posted
being a specialized laminar flow unit
with very narrow pleats.
i do both!
Does it make a difference whether or not I mount the prefilter in the box right behind the HEPA, or outside of the box, on the blower?
but one in front of the blower is sufficient.
this will depend on the amount of use the flowhood receives
How often do you have to change your pre-filters?
and how clean the air is in the working environment in the first place.
rodger gave some parameters for this
but i can't trace them at the moment.
Posted 29 April 2005 - 02:21 AM
I am sort of trying to shoot for portability in building a flowhood, as it will have to be moved long distances several times throughout the year. Is the average 12"x24" flowhood portable? Approx. how heavy is it? Can one person easily carry a flowhood of this size? Thanks.
Posted 29 April 2005 - 07:50 AM
Go to just about any heat and air shop in your town, and chances are they have several old furnaces rusting behind the shop. You can probably get the squirrel cage fan for ten bucks or so. If you get a blower that is too powerful, you can either get a speed controller, or simply block off part of the intake to restrict the flow.
Posted 01 May 2005 - 06:16 PM
HVAC shops throw away fans every day
usualy you just have to get to the dumpster early before the metal scrap guys get there in the AM
Posted 01 June 2005 - 03:42 PM
Posted 01 June 2005 - 06:02 PM
All in all, mine ran me about $400-450 what with wood, paint, caulk, more paint, way too many screws, some brackets, and of course the filter & blower.
It was a pain in the ass, it's ugly as sin, and it has a stripped screw in the bottom I need to Dremmel off. It didn't even take that long, except for my repeated drives to/from Home Depot & Sears. It's the Life Cube, a 2x2x2 thing of wonder with a hunk of metal breathing into the top. If I had it to do again, I would. I'd just do it prettier. And not be stoned. That's a biggie.
Posted 01 June 2005 - 07:13 PM
450.00 FOR A HOME MADE FLOW HOOD??? HOLY SHIT!!!!! I will stick to the oven TEK, thank you. The savings will buy a whack of syringes..............
Oh yea, I don't have any idea where to buy a flow hood. I was going to say build one but not now! LOL
Posted 01 June 2005 - 07:40 PM
Posted 01 June 2005 - 07:43 PM
i built a shell that is 22 x 18. i have a 265 fantech and need a filter which i intend to purchase some day. I believe it will run $150.
anyway, here's the tek i followed. i simply added 6 inches to account for the larger filter
Posted 01 June 2005 - 08:33 PM
Posted 01 June 2005 - 11:29 PM
Posted 01 June 2005 - 11:41 PM
$50. Filters. The whole 9 yards. I too am going to build one soon. I've been looking and they really have some good deals. Also check for flow hoods all ready to go. There on there from time to time for under $200 with a filter.
Posted 01 June 2005 - 11:55 PM
Posted 03 June 2005 - 12:41 AM
Posted 18 October 2005 - 01:13 PM
I guess the question is: does anyone think that this filter is good enough?
Posted 18 October 2005 - 01:20 PM
doesn't say what size fan you'd need nor if the flow is laminar...
but i can't honestly give an expert opinion
as i've not seen one like it before.
- Earthling likes this
Posted 18 October 2005 - 02:29 PM