decaBDE will burn to CO2 and bromine. Bromine is highly chemically reactive and will easily be caught in a filter. Most chemicals are like that, they are eithe

decaBDE will burn to CO2 and bromine. Bromine is highly chemically reactive and will easily be caught in a filter. Most chemicals are like that, they are either non-reactive and safe, or reactive and dangerous but easily filtered. (The in between stuff is a bit harder.) Interestingly it's true for nuclear reactions: The highly radioactive stuff decays very fast and is not a problem, the really long lived stuff is barely radioactive. The worrisome stuff has medium length lives.