<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:large"><span style="font-size:small">On Fri, Jan 29, 2021 at 11:02 PM biocharFIRST <<a href="mailto:wmknauss@gmail.com">wmknauss@gmail.com</a>> wrote:</span><br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Computer fans are a good way to move air. I have had good luck using them for primary and secondary air and forced air heat exchangers. Something between a 2 to 10 watts, 120mm ,12v, 50 to 100 CFM fan should work for a vent hood. You can find these new for around $5. You will most likely have a power supply laying around the house that will work and you can add a step down speed controller for under $5. </div></blockquote><div><br></div><div><div class="gmail_default" style="font-size:large">It is worth a try, but I suspect that life expectancy in a hot exhaust stream might not be quite the same as with cool room air being blown into a heat zone. Some of the guys doing woodgas engines discovered that they had problems with fans on the back end of the retort. Mind you, they did not have any cool room air added to the stream as would be the case for a vent hood. Does anyone have any idea the CFM of exhaust a TLUD produces?</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">David Meed</div><div class="gmail_default" style="font-size:large"><-relurk-></div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 29, 2021, 11:42 AM dan weinshenker <<a href="mailto:danweinshenker@gmail.com" target="_blank">danweinshenker@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Make exterior chimney with 1/2 barrel, vertical, top end cut off. Once draft established, complete unit should draw. <br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jan 29, 2021, at 10:18 AM, <a href="mailto:ajheggie@gmail.com" rel="noreferrer" target="_blank">ajheggie@gmail.com</a> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>Ronal</div><div><br></div><div>One would still need to have a pressure difference from the area above the stove to the outlet from the hood. Much of the temperature gradient from the fire to the chimney top has been lost in the mixing of flue gases and ambient air in the cooking area. In the absence of a fan what would determine what path the gases chose to take, if the hood presented an obstruction the gases would simply go round and up? In a windy area something like the cowl used in oast houses might produce enough depression but that also adds to cost and complication<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 28 Jan 2021 at 11:17, Ronal Larson <<a href="mailto:rongretlarson@comcast.net" rel="noreferrer" target="_blank">rongretlarson@comcast.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue"">Stove list:</div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue";min-height:12px"><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><span style="white-space:pre-wrap"> </span>I’ve been talking with several list members about one drawback of TLUDs being the complexity and cost of adding a chimney. As clean as TLUDs are, they would certainly receive more favorable notice if the exhaust could be easily vented. </div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue";min-height:12px"><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><span style="white-space:pre-wrap"> </span>A quarter of a converted waste 200 liter (55. gallon) barrel might do it cheaply enough. .Can come in different colors - and 4 can be totally made locally from one drum - dimensions about 28 x 28 x 82 cm (11 x 11 x 33 inches).</div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue";min-height:12px"><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><span style="white-space:pre-wrap"> </span>Is using a locally made quarter-barrel a new or old idea? Dimensions close enough to ideal? I presume there are dozens of ways to mount and allow different amounts of closure for winter and rainy conditions.. or if electricity is possible - a fan and light.</div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><span style="white-space:pre-wrap"> </span>Height above TLUD could be up to stove owner. This width looks like it could handle 3-4 stoves in a row. US hoods seem to be standard at 30 inches width.</div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue"">Ron</div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><br></div><div style="margin:0px;font-stretch:normal;font-size:11px;line-height:normal;font-family:"Helvetica Neue""><div><PastedGraphic-1.png></div></div></div>_______________________________________________<br>
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