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Hi,
I talked to the local pottery store today to cost out existing kiln vent systems like orton and bailey. He told me that the cone type suspended vent that I was looking at isn't recommended because it is isn't as effecient at removing fumes. He suggested the direct kiln vent which he says is better. Makes sense too I suppose. Apparently you need far less CFM because you really only want a negative pressure in the kiln, so not enough to remove all the heat. He said you can keep the cone suspended if you wish to vent heat out of the room in the summer etc. This has thrown all of my plans into chaos! I will have to think about all of this.... Zander "wayneinkeywest" wrote in : Right Steve, but since Z wants to use an inline one, that means that it's going to be a puller, not a pusher. Also, here the "powers that be" discourage the use of outside fan assemblies, except in commercial or roof applications, citing noise complaints from neighbors. The last thing they need is a nosy inspector, which is why I suggested using a dryer vent type exhaust. Easy enough for the inspector to spot and think "oh, that's a dryer" and let it pass :) The ever devious Wayne Seidl "Steve Mills" wrote in message ... To add to what Wayne has said, be aware that there are 2 types of extractor fan which we can call *pushers* or *pullers*. Pushers don't pull very well and vice-versa. As a pusher would be, as Wayne said, in a bit of a hot spot, it would probably be best to use a puller type as close to the outside wall as possible. There are exterior mounted ones available, I know because we're having one set up as the kitchen stove extractor; we're fed up with being deafened by the one in the cooker hood! Steve Bath UK In article , wayneinkeywest writes When you go through the wall, you can go directly into one of those aluminium (not plastic...remember...heat!)"dryer vents"., Depending on where you live, you might want one that keeps critters out. If it is truly at ground level, like _right_ on the ground, you might want to put an elbow and raise it \three or four feet to keep it out of the snow, if you have any. Take a look at how your dryer vents, and do roughly the same thing. You do NOT have to go right to the roof line. I doubt anyone is going to be out there with their nose stuck in the vent. If your neighbors are VERY close to that side of the house, run the vent (over the top and) into a plastic bucket on the ground that is filled with water, with the vent pipe sticking into the water. Just remember to change/add water occasionally. Passing the kiln gases through the water will help filter anything harmful out. That's not foolproof though, so don't try that inside! I know it's not easy chopping concrete. Maybe there's a cellar window nearby that a glass pane can be removed from to send the pipe outside? Alternately, you can bury the bucket so the top is _just_ at ground level, and run the vent line into it from the top. With that, though, you have to be careful nothing falls in, like small animals or kids, or tries to drink the water... like small animals or kids :) For the vent fan, look at the CFM rating on the fan itself. You will want something with at least 250 cfm. More than a bathroom fan vent. You might have to special order it. Check with manufacturers like Broan or Nutone. I don't know how long a "run" you have planned for your piping (in feet/meters). Obviously, the longer the distance the stronger the fan should be. Don't worry about getting one too strong, as you can always raise the vent hood further from the kiln. If you're going to use an "in-line" fan/booster motor, place it in the line just at the wall going outside, to give the heat a chance to cool a bit before sending it through the motor, keeping the motor inside, and out of the weather. I've seen the motors mounted right on the hood itself, and they don't seem to hold up as long. (Duh! sitting on top of 2300 degrees which is being sucked into an electric motor?!) Hope that helps, Wayne Seidl What should I do outside? Is it ok to vent at ground level? Or should I run the pipe all the way up to the roof line? And, what kind of fan should I get. They sell in-line duct fans here that are really meant as 'boosters' or do I need something more serious? Thanks again for any advice. Zander -- Steve Mills Bath UK |
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