Lightning wrote:Sunny Boy wrote:Lightning wrote:As a matter of fact I've seen just the opposite happen. If more secondary air is added, the chimney draft will get stronger as more heated air mass is pulling up the chimney. More chimney draft means more primary air as well.
Does it continue to do that, or just at first for a while ?
It continues to pull better. I used to have chimney draft failures during warm weather burns until I learned that
Excessive secondary air helps drafting. Now, even today, I have my secondary air with the bigger openings on them. This technique has never failed me. Secondary air promotes draft strength.
.06 + .04 DOES NOT EQUAL .10 in this case
Look, I understand that it doesn't fit logic on the surface but this is exactly what happens in the big picture.
dustyashpan wrote:mandated EPA legal logo sticker on ID plate all newer stoves. take a look. no new stove exempt. passed these rules 1970-80s era & later. old stoves grandfathered exempt. cant make everyone scrap old stoves cuz of law. not everyone wants & can afford new stove.
manometer readings OP topic. operating chimney is like big vacuum cleaner. put one hose on vacuum, pulls real hard. put 2 separate hoses on same vacuum cleaner, pulls less hard on each. put 5 hoses on same vacuum, pulls even less on each hose. vacuum drops as more vents fed.
above fire bleeds air, takes chimney draw away from below fire ashpan draft air. I checked this. blocked window vents in Harman, fire burned harder same knob setting, could turn draft knob down more & maintain same fire. Harman has tiny slit above fire bleeds, not a problem.
some stoves have huge above fire air bleeds & are problematic, typical low draft issues, & MPD, baro, etc install effort to recover draft.
Sunny Boy wrote:I think there's a misunderstanding here about EPA compliance.
That tag you show says nothing about EPA coal regulations or compliance with regulations. It just says that appliance is for burning coal only, and using any other type of fuel in it is against Federal law. Being illegal for burning anything other than coal is because stoves for other types of fuels ARE regulated by the EPA.
Here's an example of an EPA compliant domestic use stove and the tag info it has. Two pix of the tag on the back of my Napoleon wood stove. Notice the similarities to your picture. But, more importantly the additional info about being in compliance with EPA emission standards as of the date of manufacture.
In case anyone can't make it out, it says;
"US ENVIRONMENTAL PROTECTUION AGENCY Certified to comply with July 1992 Particulate Emission Standards.
EPA 028888 "
That EPA compliance notice and the number are not listed on coal stoves because there is no need for compliance what with domestic use coal stoves being exempt.
When I first started looking at coal stoves, I went to a Hitzer and Harmon dealer and I was told the same thing that Paul just said. The dealer told me that coal stoves and cook stoves (both wood and coal) are not regulated by EPA. So, unless two different dealers mislead me, I would have to agree with Paul. I also just went to the EPA website and could not find any regulations on domestic coal stoves. When I did a search, all I got was regulation for coal burning electric utilities.
If anyone can find any regulation on the EPA website that says domestic use coal stoves aren't exempt from emission standards, I'd be interested to see it. As I said, I searched the EPA site and found nothing regulating coal stoves, other than commercial coal stoves.