The Bradford White MI40T6FBN-394 features the ScreenLok Technology flame arrestor and Hydrojet Total Performance System. A temperature and pressure control valve is mounted on top of the hot water tank. This unit is only for use in altitudes under 2,000 feet.
ScreenLok Technology helps to prevent fires by keeping flames from traveling back through the arrestor panel to the outside of the unit; the flame arrestor design is patented by Bradford White. The Hydrojet Total Performance System reduces sediment and mixes cold and hot water in the tank more completely than previous models. Thoroughly mixing the water reduces temperature variations and improves the hot water tank's energy efficiency.