Also being a EMT/Fire Fighter for 5 years i'l have to agree with Mr. Haunt on the safty aspects. Although being a haunt owner I can also tell ya its almost next to impossible to design a haunt which would allow the use of streachers and backboards. The way to get around this would be to have a center "emergency" space or hallway of some sort which leads to an emergency exit. This way the customer could be carried (if a firefighter knows his job he'll be able to carry the customer regardless of size) into this area and a timly and safe manner, and then out the door. Another item Mr. Haunt left out is to have a AED available on site incase someone would happen to go into cardiac arrest. They are becoming cheaper and very easy to use.
Hope everyone has a safe season!