Are the contents of a dry chemical extinguisher toxic?
No, they are not. Dry chemical extinguishers are usually filled with Mono-ammonium phosphate, which is a non-toxic substance. However, large amounts of this powder in the air can make it difficult to breathe. As soon as a dry chemical extinguisher is discharged, leave the area and call the fire department at 9-1-1 to make sure the fire is out.