perfect for a larger family and a great value for the location! he stated that flames also appeared to be behind the propeller, which was turning, and "under where the pilot would sit." i have printed all the information from your web site to present to my school district for consideration. all we do is expose once sheltered trees to the wind. originally built in 1984, this 1-story home sits on a 384,998 square foot lot. the fan 503 is turned on if the temperature inside the housing 20 rises to in excess of 50 degrees centigrade. makes me want to buy stuff. 