This is a multi-part message in MIME format. I recently constructed a home made vent hood for my alp. Roast-a-hood as I like to call it. I read post about putting dryer = ducting on the unit but heard stories about blow back. There is some smoke that does escape from the unit around the lid and yes I like to peak inside which lets = more smoke out. I live in a small loft and any smoke seems to hang around forever = so........ This thing works just like your stove ventahood. I bought a plastic = storage tub at container store. Its about 30"X18"and has a lid. Next go to home depot and get a = bathroom exhaust fan without a light $12.and some dryer flex venting either 3'' or 4'' = Mount the fan in the bottom corner of the tub. Cut a hole for the = exhaust port. I used a couple of blocks of wood on the inside and out of = the tub and screwed it in. This fan has a 3" exhaust port so I installed = a 4'' dia flange in the tub so it would mate with the 4'' bathroom vent flex = tubing in my loft going to the roof. I'm sure the 3'' flex tubing will work fine and most folks probably = don't have the ability to access the outdoor roof vent so putting the vent tube out the window will work. So = flip the tub outside down so the fan is at the top put the alp on the lid that came with the tub(works = good for catching the rouge chaff and when you are done you can lower the hood down and seal the tub cause = this thing still stinks after a bunch of roast). Use a couple of 8" blocks under one end to prop it = open to let it breath while roasting. plug in some ac and presto. NO = SMOKE. The advantage of not putting a fan directly on the alp smoke = stack is that you won't be sucking air thru the unit while roasting = which would lower the inside temp. This thing works great for me. Total = cost was about $35. good luck .