According to the ada if an object is mounted to the wall like fire extinguishers often are and their leading edges are located between 27 inches and 80 inches above the finished floor the mounted object can protrude no more than four inches into walkways corridors passageways or aisles.
Height of wall mounted fire extinguisher.
Larger fire extinguishers need to be mounted at lower heights with the carrying handle about 3 feet from the floor.
With one extinguisher total mass above 4kg and the 2nd extinguisher below 4kg both extinguishers can be mounted on the wall at the heaviest extinguisher handle fixing height of 1 metre.
To prevent fire extinguishers from being moved or damaged they should be mounted on brackets or in wall cabinets with the carrying handle placed 3 1 2 to 5 feet above the floor.
Where fire extinguishers can not be wall mounted the use of fire extinguisher stands is recommended.
The carrying handle of a portable fire extinguisher with a total gross mass of less than 4kg should be sited at 1 5 metres from the floor.
A note of warning on pre serviced fire extinguishers.
To prevent fire extinguishers from being moved or damaged they should be mounted on brackets or in wall cabinets with their carrying handles placed 3 1 2 to 5 feet above the floor depending on the type of extinguisher.