[Stoves] At what temperature are the bad gases from zinc created, vs harmless zinc oxide?

[Alex English]

Art,
Good reference.
I would make an edit, that Copper not be lumped with Lead and Mercury. 
It is also a nutrient.
http://en.wikipedia.org/wiki/Copper_in_health

Alex

On 01/02/2013 6:41 PM, Art Donnelly wrote:
> Hey,
> Having spenr many years doing Art casting and welding I had to learn 
> about this subject. Also I get asked about this frequently, because we 
> have a galvanized secondary-air shroud on the Estufa Finca.
>
> The following is copied from a welders safety manual:
>
> When zinc vapor mixes with the oxygen in the air, it reacts instantly 
> to become zinc oxide. This is the same white powder that you see on 
> some noses at the beach and the slopes. Zinc oxide is non-toxic and 
> non carcinogenic. Extensive research1 into the effects of zinc oxide 
> fumes has been done, and although breathing those fumes will cause 
> welders to think that they have the flu in a bad way, there are no 
> long-term health effects. Zinc oxide that is inhaled is simply 
> absorbed and eliminated by the body without complications or chronic 
> effects. Current research2 on zinc oxide fumes is concentrated in 
> establishing the mechanism by which zinc oxide causes "metal fume 
> fever," how its effects are self-limiting and why zinc oxide fume 
> effects ameliorate after the first day of exposure even though the 
> welder may continue to be exposed to zinc during subsequent days 
> ("Monday-morning fever"). Other research3 is being done using zinc 
> oxide fumes together with various drugs which results in a synergetic 
> effect for treatment of cancer and AIDS. Another area of research is 
> use of zinc compounds as the active ingredients in throat lozengers 
> that are recognized as significantly effective in reducing the 
> duration and intensity of the common cold.
> Typical “metal fume fever” begins about 4 hours after exposure, and 
> full recovery occurs within 48 hours. The symptoms include fever, 
> chills, thirst, headache and nausea. All of these symptoms, pain and 
> suffering, as well as lost work (and play) time, can be avoided 
> entirely by simply not inhaling the zinc oxide fumes. This can easily 
> be done using any of the methods described later.
> Unlike other heavy metals, such as copper, lead and mercury, zinc is 
> an essential micro nutrient. Zinc is essential to the proper growth of 
> plants and animals. Zinc forms part of the enzyme system that 
> regulates biological processes throughout the body. As shown on any 
> multi-vitamin/mineral bottle, the recommended minimum adult intake is 
> 15 mg/day.
>
> You still have to vaporize the zinc and I sorry but none of our stoves 
> is getting that hot.
> saludos,
> Art Donnelly
>