I think many people use reducer's and hope for the best. However, the distance you're running may be a problem with precipitating grease on the walls of the duct work, an obvious fire hazard. You might want to consider wrapping the duct with insulation in order that the tube itself rises to a temperature close to the air that's passing through it in order to mitigate precipitation of moisture in Greece. Just a thought!
Geoff ----- Original Message ----- From: Ron Yearns To: [email protected] Sent: Monday, August 25, 2008 6:45 PM Subject: [BlindHandyMan] current project Well since the wife and I had finished our first upholstery job in Independence I was ready for a home job instead of working for someone else. I had been talking about venting the range hood. A very old greasy non ducted thing over the gas cooktop. I had previously bought some three inch duct and a elbow. I wanted to vent it through the back into a basement stairway void. Thinking I could cut a hole in the attic and reach everything from there. Well the more I touched the old hood and measured I became convinced a new hood would be a lot cleaner to handle. I had expected to clean the old one, but without the help of a steam cleaner which would probably removed the paint also I knew it would never come really clean.. We priced some at Lowes one night. One suited us, wife. But all referred to venting through the top. I did not want to steal any cabinet space knowing a completele stairway void was behind it. A couple of days latter at Home Depot we found one to our liking, . It said it vented 7 inches up or three by 10 to the back or side. Purchased siad item. By the way, what ever happened to the Twenty nine ninety five hoods? I also purchased a dryer set of louvers for the outside and a reducer from three inch to four. Well a coupple a days latter the instruction and the size of the fan blade sunk in. I needed about 30 square inches for this thing to operate good. Remember pi r squared for a seven inch round or thre times ten. Well forget the three inch. Although I notice the non ducted option out the frount of the hood is only about two by three inches. Any to make a long story shorter I decided to run four inch. Back to Home Depot to pick up a four inch hole saw and some four inch ducting.. I knew this would be smaller than recommended but way larger than the ductless space. Anyway after cutting the hole in the attic I saw i could neither reach down to the range hood hole or out to the esterior wall. So I was able to reach the exterior with a drill and was able to fish a piec of wire into the hood hole. So now with way too many trips into the attic I have the pulled from hole to hole and the louvers fastened to the duct with the worm clamp and pushed into the exterior hole. Long day, I quit. Latter I can fasten the louvers to the siding and caulk. I need to make another attic run and install some hanger to support the ducting so it doesn't droop in the horizontal run of around six feet. Anyway I think the hard work is done. Ron [Non-text portions of this message have been removed]
