The majority of applications use LP-Gas. Emissions from LP-Gas engines meet the requirements to operate a forklift in a closed warehouse or a work environment where exhaust fumes do not pose a risk to the operator or to other persons. Electric forklifts are used in an environment where food is produced or stored and other closed environments where the operator/owner requires forklift use without exhaust emissions. Diesel forks are desired when used outside and when very heavy loads are moved over a significant distance. Occasionally, a customer will require a gasoline powered engine. This is may be used when other fuel types are not available.