Abstract: An improved cooking range includes an improved notification system that is configured to detect an operated state of the range and to periodically output a notification representative of a duration of time that the range has remained in the operated state. The notification may include the audible outputting of an sound tag representative of one or more spoken words that indicate a duration of time that the apparatus has remained in the operated state and/or an operational level of the range. The notification system can additionally be configured to detect a predetermined condition such as a flame or an excessive ambient temperature in the vicinity of the range and output an audible and/or visible warning notification. The notification system can be built into the range or can be in the form of a system that can be retrofitted to an existing range. The system enhances operational safety.

Abstract: An improved regenerative heat exchanger and seal assembly employ a plurality of instances of a seal apparatus, with each seal apparatus including a seal member that includes a seal tab that extends from one end of the seal member and further includes a corresponding notch at the opposite end of the seal member. The seal tab is receivable in a notch of an adjacent seal apparatus, and the engagement of the seal tabs in the notches creates a labyrinth seal by providing a tortuous path that resists the flow of exhaust gases and air past the seal assembly.