Although propane is one of the cleanest burning fuels, propane fueled forklifts still put out some carbon monoxide and fumes. Fumes we didn't want to have floating around throughout our warehouse and offices, which are conjoined.
We decided to get an electric forklift for our warehouse. Our forklift doesn't use any gas, so there are no fumes, which keep our workspace air quality clean.
Also, instead of buying a brand new forklift, we bought one that had been previously owned.