Flow-boosting register for air ducts

Claim 1

A FLOW-BOOSTING REGISTER FOR AN AIR DUCT OUTLET, COMPRISING: A LOUVERED GRILL OF STANDARD SIZE AND SHAPE ADAPTED FOR INTERCHANGEABLE USE IN PLACE OF A CONVENTIONAL REGISTER GRILL, A FAN POSITIONED BEHIND SAID GRILL, A MOTOR INCLUDING A HOUSING THEREFOR AND A SHAFT DRIVINGLY CONNECTED TO AND SUPPORTING SAID FAN, STRAP-LIKE MEANS AFFIXED TO SAID HOUSING AND TO OPPOSITE MARGINAL PORTION OF SAID GRILL FOR INTERCONNECTING SAID GRILL, FAN AND MOTOR AS A UNIT, AND A PLURALITY OF CONTROL SWITCHES IN SERIES WITH SAID MOTOR AND A SOURCE OF POWER FOR CONTROLLING THE OPERATION OF SAID UNIT, AT LEAST ONE OF SAID SWITCHES BEING A THERMOSTATIC SWITCH FOR ENERGIZING SAID MOTOR ONLY WHEN PRESELECTED TEMPERATURES OCCUR IN THE AIR IN SAID DUCT OUTLET, ANOTHER OF SAID SWITCHES BEING A MANUAL SWITCH INCLUDING A CASING POSITIONED BEHIND SAID GRILL, A THREADED SLEEVE PROJECTING FORWARDLY THROUGH AN APERTURE IN SAID GRILL, A NUT ON SAID SLEEVE CLAMPING SAID MANUAL SWITCH TO SAID GRILL AND A SWITCH OPERATOR PROJECTING THROUGH AND FORWARDLY FROM SAID SLEEVE, A FURTHER ONE OF SAID SWITCHES BEING A SAFETY THERMOSTATIC SWITCH SET TO INTERRUPT THE MOTOR CIRCUIT WHEN ABNORMALLY HIGH TEMPERATURES OCCUR IN SAID DUCT OUTLET, SAID THERMOSTATIC SWITCHES BEING A UNITARY ASSEMBLAGE MOUNTED WITHIN A PROTECTIVE HOUSING.