You will more than likely need to use silicon or duct tape on the connection points to prevent suction leaks.In industrial settings, restaurants and labs with fumes, gasses, VOC’s, vapor, smoke and odors it is important to have portable source capture or HVAC whole room or building commercial strength air cleaners, with new or recently replaced, replacement laboratory grade activated carbon air filters. You can acheive a bend from 0 to 90 degrees just by twisting. Lastly, if you want a 90 degree inlet, just go to the hardware store and get a 6" adustable elbow in the ventilation section for a few dollars. This should take care any issues with voids in the plywood layers. I also painted my top and bottom with a couple of coats of gloss to seal the plywood itself to make a better seal and prevent leakage into the plywood itself. 2 of the foam gaskets can replace the weather stripping on the top and bottom and may provide a better seal. I put a bead of silicon between the filters just to be sure there is a good seal and to keep the stack straight. There seems that there is no reduction do the this. They claim these are lifetime filters that never need replacing under normal use. I was concerned about loss of air flow because of the loss 3"of filter because of the stack seams but Honeywell must of compensated by adding more folds because their cleaners use pressure switches to test for if a filter needs replacing. Prices are similar for both the single and stacked filters. There are aftermarket single filters on ebay and amazon. They each come with a foam gasket that is used in some applications. The Honeywell 29500 filters now come a 4 individual "cleanable" filters. ![]() Drill (with Phillips tip and 3/8" drill bit).Plunge router with a straight plunge bit.Qty (1) Roll of post filter material (updated!).Weather stripping (I had leftovers from other projects, but basically 1/4" thick, foam).4'x4' piece (half a sheet) of 3/4" thick birch plywood smooth on both sides.An old extension cord (we only need the male end).Qty (1) 3/8" dowel pin (for the router jig).Qty (1) 3/8" Romex clamp or cord strain relief.Qty (1) Roll of squishy neoprene shelving liner (It's about 1/8" thick, soft, makes great gaskets).Qty (1) Harbor Freight Router Speed Controlled.Just ask for "4 by 8 coconut shell carbon, for vapor filtration") Qty (1) 55lb bag of activated carbon (I called them and spoke to Karrie Gibbons.Qty (1) Duck Brand 1285234 24-Inch by 15-Inch by 1/4-Inch Foam Air Conditioner Filter.Qty (2) 3M Filtrete Air Conditioner Filter, 15-Inch by 24-Inc.Qty (1) 29500 Honeywell Air Cleaner Replacement Filter. ![]()
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