Emergency shutoff for air conditioners
 An object of this invention is to provide an emergency drain for units such as air conditioners and the like, operative to collect fluid and shut off the unit when the primary drain for the unit becomes obstructed, thus protecting against damage due to overflow of the fluid, and wherein a low pressure is produced in the drain for evacuating fluid from the drain pan of the unit. Another object is to provide a one-way valve in the drain from an air conditioner or other appliance, whereby reverse flow of air or other fluid from the drain to the unit is prevented. The emergency drain comprises a fitting (11) mounted in the drain pan (14), with a primary drain opening (16) and a secondary or emergency drain opening (17) for draining away fluid accumulated in the pan when the primary drain becomes blocked. A one-way valve (37) is provided in the drain for preventing back flow of air or other fluids from the drain to the pan, and a venturi (39) is positioned in the drain pan (14) to produce a low pressure from the flow of air circulated by the air conditioner fan. A tube (38) connects the venturi with a reservoir (22) which collects the fluid drained by the emergency drain (17), whereby the fluid is evacuated through the emergency drain. 
F
F24F
inventional
Daniel R. Ross J. Kenneth D.
Morrison Petrie Savage