Patent ID: 8070569

Claim:
A cooling apparatus for temperature sensitive components or equipment housed in an enclosure comprising: a) a cabinet being in air flow communication with said enclosure such that air may be directed into said enclosure from said cabinet and exhausted from said enclosure through said cabinet; b) intake means secured to said cabinet, said intake means having open and closed positions such that air from the atmosphere can enter said cabinet when said intake means is in said open position, said intake means being disposed in said open position in the absence of power from an external power source; c) exhaust means secured to said cabinet, said exhaust means having open and closed positions such that air can be exhausted into the atmosphere from said cabinet when said exhaust means is in said open position, said exhaust means being disposed in said open position in the absence of power from said external power source; d) a fan and a fan motor for operating said fan, secured in proximity to said exhaust means such that said fan exhausts air from said enclosure through said cabinet when said fan is in operation; e) an internal power source for said fan motor; and, f) a control circuit for controlling power from said external power source to said intake means and said exhaust means to allow said intake means and said exhaust means to open and to cause said fan motor to operate if either (1) said power from said external power source fails, or (2) the temperature of air in said enclosure rises above a predetermined temperature, and further, to cause said intake means and said exhaust means to close and to cause said fan motor to not operate if both (1) said power from said external power source has either not failed or has been restored after said failure, and (2) the temperature of the air in said enclosure is at or below said predetermined temperature, said control circuit further being able to subsequently allow said intake means and said exhaust means to reopen and to restart said fan motor after a maximum predetermined period of time has passed following restoration of said external power source after said failure if the temperature of the air in said enclosure remains above said predetermined temperature.