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.

A heating ventilation and air conditioning (HVAC) combustion suppression system. The HVAC combustion suppression system includes a sensor that detects and emits a signal indicative of a refrigerant released from an HVAC system into an enclosed space. The system also includes a suppression component that blocks or reduces combustion of the refrigerant in the enclosed space, and a controller that receives the signal from the sensor. The controller in response to the signal activates the suppression component to suppress combustion of the refrigerant in the enclosed space.

A heating ventilation and air conditioning (HVAC) combustion suppression system. The HVAC combustion suppression system includes a sensor that detects and emits a signal indicative of a refrigerant released from an HVAC system into an enclosed space. The system also includes a suppression component that blocks or reduces combustion of the refrigerant in the enclosed space, and a controller that receives the signal from the sensor. The controller in response to the signal activates the suppression component to suppress combustion of the refrigerant in the enclosed space.

It is described herein a venting apparatus for an opening in a roof. The venting apparatus for an opening in a roof may comprise a structural frame, an adapter, a mount, a hinge, and a latch. The adapter may comprise a frame adapter section, a lip extending inwardly from a portion of the frame adapter section inner surface, and a protrusion extending upwardly from the lip. The frame adapter section may be configured to fit around an outer surface of the structural frame while the mount may be configured to fit around an outer surface of the protrusion. The latch may be configured to receive a signal from a device when the device detects the presence of smoke within the building to cause the latch to change from a latch closed position to a latch opened position.

A damper of a heating, ventilation, and/or air conditioning (HVAC) system includes a crank configured to rotate about an axis of a shaft relative to a support, a reset arm configured to rotate about the axis of the shaft relative to the support, a spring coupled to the crank and the reset arm, and a fuse link configured to be coupled to the reset arm and the support in a set configuration and to release the reset arm from the support in response to a temperature exceeding a threshold temperature. The crank and the reset arm are configured to rotate away from the support in a first circumferential direction toward a closed configuration in response to the fuse link releasing the reset arm from the support. A spring force of the spring is configured to increase to enable the reset arm to rotate in a second circumferential direction opposite to the first circumferential direction beyond the set configuration and into a reset configuration.

Smoke and/or soot damage to an interior of a property, such as a residential building or home, may be mitigated. A controller is in communication with a heating, ventilation, and air conditioning (HVAC) system of the property. The controller is configured to receive an alert and/or intelligent home telematics data generated based upon a potential presence of smoke in a location associated with the property, either exterior or interior to the property. In response to receiving the alert and/or intelligent home telematics data, the controller is further configured deactivate an air circulation function of the HVAC system to mitigate smoke or fire damage to the property. The intelligent home telematics data may be generated by various smoke, fire, audio, visual, infrared, motion, and/or other smart sensors mounted about the interior and/or exterior of the property.

A firestat for providing an output for controlling an opening and closing of a fire/smoke damper. The firestat includes a fire/smoke damper test switch and an actuator configured to depress the fire/smoke damper test switch. The firestat is further configured to release the fire/smoke damper test switch in response to a depressing force applied to the actuator, wherein melting or other damage to the actuator causes a release of the test switch.

A firestat for providing an output for controlling an opening and closing of a fire/smoke damper. The firestat includes a fire/smoke damper test switch and an actuator configured to depress the fire/smoke damper test switch. The firestat is further configured to release the fire/smoke damper test switch in response to a depressing force applied to the actuator, wherein melting or other damage to the actuator causes a release of the test switch.

An air purifier includes a main body having an inlet and a discharge device mounted on the main body and configured to receive air introduced into the main body through the inlet and discharge the air from the air purifier, wherein the discharge device includes a discharge opening, an opening and closing member including a portion having a size and shape corresponding to the discharge opening, and configured to move out of the discharge opening and into the discharge opening to open and close the discharge opening, and a discharge portion including a plurality of discharge holes, wherein each discharge hole of the plurality of discharge holes has a size smaller than a size of the discharge opening, and wherein the discharge portion has an air discharging area that is variable.

An air purifier includes a main body having an inlet and a discharge device mounted on the main body and configured to receive air introduced into the main body through the inlet and discharge the air from the air purifier, wherein the discharge device includes a discharge opening, an opening and closing member including a portion having a size and shape corresponding to the discharge opening, and configured to move out of the discharge opening and into the discharge opening to open and close the discharge opening, and a discharge portion including a plurality of discharge holes, wherein each discharge hole of the plurality of discharge holes has a size smaller than a size of the discharge opening, and wherein the discharge portion has an air discharging area that is variable.