Abstract: An exposed high induction supply air duct is provided and is adapted to be installed in an open ceiling environment. Conditioned air is diffused from the supply air duct through an array of nozzles disposed along the length of the supply air duct. At the same time, existing air in an open space underlying the duct is induced upwardly towards the nozzles where the existing air is efficiently mixed with the supply air being exhausted by the nozzles.

Abstract: The present invention relates to a rooftop exhaust fan that is pivotally mounted to a curb or other support structure and which, in response to pivoting the exhaust fan from a closed position to an inclined open position, the exhaust fan is automatically locked in the inclined open position.

Abstract: A rooftop exhaust fan incorporates a mechanical motor lockout that prevents a fan motor from being energized when the exhaust fan assumes an open position for cleaning, maintenance or inspection.

Abstract: An exhaust fan configured to exhaust air from a building includes a housing, a fan, and a motor for driving the fan. Overlying the fan is one or more dampers that are moveable from a closed position to an open position. Underlying the dampers is at least one pivot arm per damper that is pivotally connected to the fan and which normally assumes a horizontal position spaced from the overlying damper. A mechanical fusible link is connected to the pivot arm and is configured to break in response to a buildup of heat in and around the dampers. Once the fusible link breaks, then the pivot arm is operative to engage and open the overlying damper.

Abstract: A grease duct assembly is employed in a commercial kitchen. The grease duct assembly includes multiple sections that are connected together and sealed. Each section includes a double wall construction that forms a central conduit and an annular space that extends between an inner wall and an outer wall. Shredded insulation is directed into the annular space and compressed therein.

Abstract: An exhaust system for exhausting air from appliances in a commercial kitchen is described. The exhaust system comprises an exhaust fan that includes a housing, a motor mounted in the housing, and a fan directly driven by the motor. A motor compartment surrounds the motor. Cooling air is induced into and through the housing and directed into the motor compartment for cooling the motor. Cooling air is discharged from a motor compartment and mixed with exhaust air to form an air mixture that is directed through the housing of the exhaust fan.

Abstract: The present invention entails a rooftop exhaust system for a building. The exhaust system includes a motor that is configured to directly drive a fan. The fan during the course of operation generates a negative pressure on the upstream side of the fan. This negative pressure is utilized to induce outside cooling air into a shroud that partially encloses the motor. Cooling air passing through the shroud contacts the motor and heat associated with the motor is transferred to the cooling air after which the cooling air exits the shroud.

Abstract: A grease duct assembly is employed in a commercial kitchen. The grease duct assembly includes multiple sections that are connected together and sealed. Each section includes a double wall construction that forms a central conduit and an annular space that extends between an inner wall and an outer wall. Shredded insulation is directed into the annular space and compressed therein.

Abstract: An exhaust system for exhausting air from appliances in a commercial kitchen is described. The exhaust system comprises an exhaust fan that includes a housing, a motor mounted in the housing, and a fan directly driven by the motor. A motor compartment surrounds the motor. Cooling air is induced into and through the housing and directed into the motor compartment for cooling the motor. Cooling air is discharged from a motor compartment and mixed with exhaust air to form an air mixture that is directed through the housing of the exhaust fan.

Abstract: A rooftop exhaust fan incorporates a mechanical motor lockout that prevents a fan motor from being energized when the exhaust fan assumes an open position for cleaning, maintenance or inspection.

Abstract: The present invention relates to a fire extinguishing system for a commercial kitchen. The fire extinguishing system comprises a canister containing a fire extinguishing agent and a gas expellant. In the event of a fire or conditions that pose a threat of a fire, the internal pressure in the canister is utilized to actuate a main control valve of the canister which releases the fire extinguishing agent from the canister.

Abstract: The present invention relates to a rooftop exhaust fan that is pivotally mounted to a curb or other support structure and which, in response to pivoting the exhaust fan from a closed position to an inclined open position, the exhaust fan is automatically locked in the inclined open position.

Abstract: An exhaust fan configured to exhaust air from a building includes a housing, a fan, and a motor for driving the fan. Overlying the fan is one or more dampers that are moveable from a closed position to an open position. Underlying the dampers is at least one pivot arm per damper that is pivotally connected to the fan and which normally assumes a horizontal position spaced from the overlying damper. A mechanical fusible link is connected to the pivot arm and is configured to break in response to a buildup of heat in and around the dampers. Once the fusible link breaks, then the pivot arm is operative to engage and open the overlying damper.

Abstract: Disclosed herein is a system and process for monitoring and controlling fire suppression systems in commercial kitchens. Repeatedly various components of the fire suppression systems are tested for faults. When a fault is detected in a particular component, the fault is communicated through a communications module associated with the commercial kitchen via the internet to one or more remote servers. Upon receiving information indicating a particular fault, the one or more remote servers acts to alert interested parties of the default.

Abstract: Disclosed herein is a system and process for monitoring and controlling fire suppression systems in commercial kitchens. Repeatedly various components of the fire suppression systems are tested for faults. When a fault is detected in a particular component, the fault is communicated through a communications module associated with the commercial kitchen via the internet to one or more remote servers. Upon receiving information indicating a particular fault, the one or more remote servers acts to alert interested parties of the default.

Abstract: A heated air makeup unit comprising a heating chamber with a modulated furnace one or more non-modulated furnaces air temperature control and efficient furnace operation over a wide heating rate range. The utilization of indirect fired furnaces in the heated air makeup unit is disclosed. A control system is included to provide control of heated air temperature to within +/?1 F.° using continuous control of the heating rate of the modulated furnace and stepwise activation and de-activation of the non-modulated furnaces in response to heating demand. A programmed combustion air flow controller programmed to provide optimal airflow for any gas flow in a flow range of a modulating gas valve is provided to assure combustion efficiencies of at least 83%.

Abstract: A kitchen exhaust hood assembly having a fire suppression system with built-in redundancy and monitoring capabilities is presented. The fire suppression system includes one or more fire suppression devices associated with the kitchen hood for extinguishing a fire within the vicinity of the exhaust hood. The fire suppression devices can be triggered by a series of manual actuators or fire sensors. A switching circuit including a plurality of switches operatively connected to the manual actuators or fire sensors triggers the fire suppression devices by enabling either a first or second actuating circuit.

Abstract: A kitchen exhaust hood assembly having a fire suppression system with built-in redundancy and monitoring capabilities is presented. The fire suppression system includes one or more fire suppression devices associated with the kitchen hood for extinguishing a fire within the vicinity of the exhaust hood. The fire suppression devices can be triggered by a series of manual actuators or fire sensors. A switching circuit including a plurality of switches operatively connected to the manual actuators or fire sensors triggers the fire suppression devices by enabling either a first or second actuating circuit. The switching circuit and first and second actuating circuits are configured such that a break in the electrical connection between the switches and actuating circuits does not cause a failure in the operation of the fire suppression system. A supervision module is included in the assembly for monitoring the elements of the fire suppression system.

Abstract: A system for directing two separate streams of air to a commercial or industrial kitchen environment. The system includes a dual airflow plenum that is normally disposed adjacent a kitchen exhaust hood. Typically one stream of air is a tempered, that is heated or cooled, and is directed through the dual airflow plenum to where it is exhausted at an area or point adjacent the exhaust hood. A second untempered, that is ambient air, air stream is directed through the same dual air flow plenum and is exhausted into an area adjacent the exhaust hood. Preferably the plenum is positioned with respect to the exhaust hood such that the outlet for the untempered air is disposed generally between the exhaust hood and the outlet for the tempered air. Moreover, the relative velocity of the two air streams is maintained or controlled such that the velocity of the tempered air stream is equal to or greater than the velocity of the untempered air stream.

Abstract: A kitchen hood assembly includes a combination hood cleaning and fire suppression system. The hood assembly includes a hood structure and a riser connected thereto. An exhaust blower forces an exhaust stream of air into the hood and through the riser. A combination hood cleaning and fire suppression system is incorporated into the hood structure. The combination hood cleaning and fire suppression system includes an elongated spray bar that is connected to a water source and includes a surfactant injector that injects a surfactant into the water being directed to the spray bar. In one mode of operation, the spray bar is effective to clean the hood assembly. In another mode of operation, when a fire is sensed in or in the vicinity of the hood, the same spray bar is utilized to inject an aqueous liquid into the hood to suppress the fire.