[sandman]

Flowhoods - the holy grail of our hobby. They allow you to do sterile work without any worry of contammination when used properly. Basicaly a flowhood consists of a blower motor (squirel cage blower) and a big assed HEPA filter. They are mated in such a way that you work directly in front of the filters face under a constant laminar stream of filtered air.

***Required for building my flowhood***
Electric Drill with big drillbit for starting compound cuts
Jigsaw for making compound cuts
Loctite Power Grab (I used about 2.5 tubes)
Silicone Caulking
Caulk Gun
Killz 2 Primer/Sealer and paintbrush
Automotive filter for Prefilter
HEPA Filter
Squirell Cage blower

First things first....decide how much work space you need. I opted for the ginormous 2'x4'x6" 99.999% HEPA. I think most would find a 1'x2'x6" or 2'x2'x6" filter more suitable since this thing takes a lot of space up. Make sure you get at least a 99.99% filter. Regular filters for normal hepa filter machines that are available at WalMart or whatever will NOT WORK for this purpose. You need the real deal 6" thick 99.99+% filters made for this application. Try ebay, or search arround. Perhaps ome sponsers here sell the filters. Expect to pay $100+ for the filter.

OK then, now you need a squirell cage blower. You will need a blower that produces adequate cfm at the pressure your filter creates. There are some flowhood math involved....I didnt really do any here, cause I basically matched what fungi.com calls there Series IV hood it ays it is a 2'x4' filter with a 1/3 hp blower motor, so thats what I got. My blower is rated at 1200cfm. I would imagine that a 500-800 cfm blower would be sufficient for a smaller filter like the 2'x2'.

I constructed my hood with no nails, no screws and hardly any brain cells. All that you are doing is building a box arround a filter, then a box on top of that to house the blower and prefilter. 2 boxes. Real easy. Especially when your just using Loctite Power Grab construction glue/caulk stuff for putting it together.

You will need to draw up some plans after you get your filter and blower delivered since they will all be variable in exact size. Dont worry though its easy once you check out this teks pictures you will get the idea.

The dood at lowes or whatever will cut your dimensions for free! Except for the hole for the prefilter and the slanted sides and the hole for the blower input on the top panel, since it is a compound cut you will have to make these yourself which will require a drill and a jigsaw. The whole thing is nothing more than a bottom panel, 2 side panels, back panel, top panel, and the 5 panels for the smaller prefilter box. 10 peices...make sure you concider the width of the lumber your uising and how it will fit together so your shit comes together right. Thats why i used 1/2" lumber cause its easy to calculate how the peices fit together.

Ok so to begin construction....Lay your bottom panel out, mark where your filter will lay, and apply a good ammount of Power Grab where the filter will go. Lay the filter on the bead of glue and press down. Look your almost done! JK but not really. Now lay a bead where the side panels will go. All over the side of the filter and everything. Lay on the sides. Repeat for the top panel. Now on the inside before you put the back on, lay a bead of silicone allong the edges of all the joints and allong the filter so it is airtight in there. Then lay your glue for the back panel and apply. At this point your hood is basicaly constructed.

Now grab your blower and lay it on a bead of glue over your hole on the top panel for blower input. Get it nice and sealed up with more caulk or duct tape if you have to. Now lay the panels for the box that goes arround the blower with more Power Grab glue. Insert and glue your prefilter to the top panel of the prefilter box, then glue that panel to the top over you blower and general construction is complete!

All you need to do now is to paint the work area and all of it if you want with some Killz 2 primer/sealer. 2 layers of paint here so you can wipe alcohol all over the place all day long.

Pretty much that it...your done. Test her out....feel the breeze!