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Health & Safety

The brazing process has been used to successfully join dis-similar metals for over 3000 years and is still widely regarded as probably the most versatile metal joining technique. If the correct alloy is used for the application, the joint designed and heated correctly the process is as safe as any other industrial process.

Normally it is only when there are variations to the above that problems could arise.
These include attempting to braze without using flux
brazing in a close poorly ventilated area
prolonged heating with an intense heat source eg oxy-acetylene
or a combination of the above or other bad brazing practices.

There are two aspects worthy of mention;
Fluxes
Heating

Fluxes

Most silver solder fluxes contain fluorides and fluoro-borates. These products should not be ingested or inhaled. If overheated they will produce noxious fumes. Fluxes should be kept in airtight containers preferably with screw caps to avoid spillage. Should spillage occur, it should be swept up immediately and the surface wiped down thoroughly with a damp cloth.
Keep away from all foodstuffs.
Keep out of reach of children.

Torches

Always light torches from underneath or from the side.
Do not point the torch towards any combustible materials.
Switch the gas supply off at the cylinders.
Store the cylinders in a safe and stable manner.

Generally the safest way to braze is to use common sense.
Keep the brazing station free of debris and dust.
Wear gloves.
Do not eat, drink or smoke when brazing.
Use only clean parts free of oil and grease.
Select the correct alloy and flux for the job.
Use sufficient flux and treat it carefully.
Heat the work evenly taking account of the weights of the components.
Watch the flux, it will indicate the joint temperature.
Don't heat the alloy - heat the joint.
Help prevent overheating by avoiding brazing in strong or bright sunlight.

IF IN DOUBT - STOP BRAZING AND SEEK ADVICE