[Stoves] A low-cost hood possibility

[biocharFIRST]

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.

On Fri, Jan 29, 2021, 11:42 AM dan weinshenker <danweinshenker at gmail.com>
wrote:

> Make exterior chimney with 1/2 barrel, vertical, top end cut off.  Once
> draft established, complete unit should draw.
>
> Sent from my iPhone
>
> On Jan 29, 2021, at 10:18 AM, ajheggie at gmail.com wrote:
>
> 
> Ronal
>
> 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
>
> On Thu, 28 Jan 2021 at 11:17, Ronal Larson <rongretlarson at comcast.net>
> wrote:
>
>> Stove list:
>>
>> 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.
>>
>> 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).
>>
>> 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.
>>
>> 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.
>>
>>
>> Ron
>>
>>
>> <PastedGraphic-1.png>
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