1. A furnace, comprising:a furnace cabinet;
a primary heat exchanger;
a secondary heat exchanger located upstream relative to the primary heat exchanger with regard to location within a circulation airflow path;
a first baffle carried by a first wall of the furnace cabinet; and
a second baffle carried by a second wall of the furnace cabinet, wherein the second baffle is located opposite the first baffle, and wherein the second wall is located opposite the first wall;
wherein each of the first baffle and the second baffle comprises a respective twice bent plate defining respective and opposing lower portions, middle portions, and upper portions, and
wherein the first baffle and the second baffle cooperate to form a nozzle within the furnace cabinet.