Air ventilation and washing system

DETAILED DESCRIPTION In the present invention, an automatic duct cleaning device is disclosed in which the spraying outlets for the hot water and cleaning fluid are located below the fluid driving system thereby avoiding the possibility of trapped water freezing in the pipe within the cleaning system.
In addition, a mechanical and a temperature controlled electircal fire extinguishing system is incorporated within the design of the duct washing system responsive to excess heat being generated within the exhaust duct network.
In the preferred embodiment of the invention, two independent conditions serve to activate each of the fire extinguishing systems.
The first condition for activating the electrical temperature controlled fire extinguishing system is the presence of relatively low temperature, in the order of 200.
degree.
F.
The precise temperature desired may be varied.
Upon the selected temperature being reached, a temperature sensitive device, such as a thermostat, will automatically activate the washing cycle of the cleaning system.
The washing detergent throughout the exhaust grease duct, will continue until the temperature at the entry of the exhaust duct sensed by the temperature controlled electrical device is less than the preselected temperature.
Such a fire extinguishing system is fully automatic and does not require the resetting of the system.
The second fire extinguishing system is a mechanical fire extinguishing system, requiring no electrical power.
Should there be a loss of electrical power due to a fire or any other reason, the mechanical fire extinguishing system continues to operate.
It is intended that the mechanical fire extinguishing system be activated at a substantially higher temperature than that of the temperature controlled fire extinguishing system, such as approximately 350.
degree.
F.
It is further contemplated that once the mechanical fire extinguishing system is activated, that it would remain activated until manually disconnected, regardless of the drop in temperature within the exhaust grease duct