Abstract: A furnace is adapted for operation in downflow, left horizontal flow and right horizontal flow positions. The furnace includes plural burners, a two-stage heat exchanger, a header box at the heat exchanger outlet for collecting products of combustion from the heat exchanger, and an inducer for inducing a flow of products of combustion through the heat exchanger. A condensate drain and trap are also provided for draining condensation from the header box and from an exhaust vent through which products of combustion are exhausted from the furnace. In accordance with one feature of the invention, a manifold is located inside the header box to divide the header box into first and second chambers. A pressure sensor senses differential fluid pressure between the first and second chambers for detecting a blocked condensate drain condition.

Abstract: A device for inhibiting NOx production is disposed in a gas furnace combustion chamber. The device includes a baffle member for dividing the combustion chamber into first and second regions. A fuel-rich mixture of gas and primary combustion air is ignited by an inshot burner and the flame is drawn into the combustion chamber by an induced draft blower along with secondary combustion air. The combustion chamber is configured such that in the first region (i.e., upstream of the baffle member) turbulent mixing of the secondary combustion air with the flame is inhibited to maintain a relatively gas-rich flame. The baffle member channels the flame and secondary combustion air into a convergent flow path and the passage of the flame and secondary combustion air over the baffle member creates turbulence, which enhances mixing between the flame and secondary combustion air in the second region of the combustion chamber (i.e., downstream of the baffle member).

Abstract: The tubular frame of the grill cart forms a laterally extending shelf with opening into which an insulated container removably nests. A heat shield of folded metal with slotted apertures to inhibit heat transfer by conduction protects the container from the intense heat developed by the grill by deflecting radiated thermal energy and by inhibiting air current convection heat transfer. The insulated container may hold either refrigerated or heated items and features opposing carrying handles which rest upon the frame to support the container with its lid in a generally horizontal plane. The lid in this position may be used as a countertop work space while tending the grill. The lid may also be flipped over to expose a contoured surface with recess compartments for holding beverage containers, plates and trays.