

Ok here is my go at a flow hood! Materials were scrounged form ebay and job sites over the last year.



The usual suspects. Blower is 20" 1/2hp HVAC model. Filters from Ebay





Filter Specs





Bottom sheet 3/4 melamine. Used Camper/truck cap foam tape to bed the blower.







Mounted!







Flipped!







Now here is where I got a little creative. The size of the blower and my aspirations for medium scale mushroom farming pushed me towards a 2 x 4 hood but a reasonable priced filter that size is hard to come by. Solution glue two 2 x 2 together! Come on you know you thought about it Had to grind the flange off of the sides of the filter to get them as flush as possible.







Sides on. Filters bonded. Sides, top and back are a re-purposed coffee hutch from a bagel shop. 3/4" particle board with 1/4" bead plywood on each side. Would have used Melamine all the way around if this had not fallen in my lap.







Squeeze out!







Top installed. Notched and rabbeted for glass sneeze guard.









Plenum. Cleated with 1 1/4" square stock, primed, with more Camper tape to seal. Ended up caulking on top of this for Belt and Suspender action.







Boxing the blower was was super easy because of the steel table base I used. Just self drill/tap screwed luan to the legs. Seal with caulk.







and Spray Foam!







Apply the front with cleated flange for prefilter.







The blower is such a beast I ended up stacking 4 Dust/alergen furnace filters slow her down.





and there she is. ain't she a buet!











Still blowing a bit too hard but It Works! No more glove box for me. Lghter test looks good. I get a little eddy where the two filters meet but it settles out 3" from the filter face. I have a lot more to do as I finish off the spawn lab so expect further updates but wanted to get this out there. Hope it helps. Stop worrying, start building!



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