MONTEREY™ TOP-VENT GRAVITY FURNACES The benchmark in top-vent wall furnace heating, our Monterey™ PLUS+ has continued to evolve in It’s performance and efficiency, while remaining arguably the most popular wall-mounted unit ever produced. Today’s iteration features a draft hood design, heat disseminating baffles, and a porcelaincoated chamber, adding valuable efficiency, longevity and energy savings for our customers.