Abstract: An air quality sensor and interrupter system includes an air quality sensor to measure the air quality around a gas appliance and an appliance shut-off device to turn off the gas appliance in response to a signal from the sensor indicating unsafe air. An exhaust can also be activated to remove the unsafe air. Unsafe air can be indicated by a measurement of 18.5% or less oxygen in the air. If the sensor fails, an alarm can alert the user and the appliance shut off until the sensor is replaced or repaired. A bypass allows the user to keep the appliance turned on, but only for a limited amount of time. The user can keep utilizing the bypass to keep the appliance turned on for extended periods of time.

Abstract: A multi-zone temperature sensor system includes a plurality of temperature sensors associated with multiple zones in an appliance, such as a gas barbeque. A display and control panel is coupled to the sensors to display temperatures in each zone and controls to set desired temperatures in each zone. A timer and/or speaker may also be included. In one embodiment, a remote control with displays and control buttons can be used in conjunction with the system. By positioning the sensors at a location where the temperature parallels the grilling surface temperatures the user has a much better indication of when the grill is ready for use.

Abstract: An air quality sensor and interrupter system includes an air quality sensor to measure the air quality around a gas appliance and an appliance shut-off device to turn off the gas appliance in response to a signal from the sensor indicating unsafe air. Unsafe air can be indicated by a measurement of 18.5% or less oxygen in the air.

Abstract: A hot fireplace includes an elongated main gas burner associated with a grate for supporting logs, there being a control operatively connected with the burner to control flow of combustible gas to the burner, the control located near the fireplace. In this environment there is a heat shield located proximate the control to intercept infra-red radiation toward said control, the shield having perforations sized for intercepting such radiation, and for passing convection air therethrough. Typically, the perforations have cross dimensions less than the wavelength of infra-red radiation.

Abstract: An improved fireplace heat transfer unit includes a gas burner tube in a layer of sand retained in a trough beneath air conduction tubes arranged transversely to the burner tube. The air transfer tubes are all connected to a manifold at the rear of the fireplace grate unit which receives air for transport through the conduits and ejection into a room.