The typical range hood height is 24 to 30 inches above the cooking surface. All range hoods have a recommended height range of installation over the cooking surface. For optimal safety and performance, consult the manufacturer's guidelines.
The lowest recommended height is the lowest distance for which the hood was tested for safety by Underwriters Laboratory, a safety organization that issues certification. If the hood is installed lower than this level, it could be damaged by the heat of the stove. The highest level is the height the hood was tested for efficiency. If installed higher than this level, efficiency of smoke removal decreases.