The 90% AFUE Tempstar PS90 gas furnace is certified for use in single pipe installations which draw combustion air from within the conditioned space. This non-direct venting gives dealers the flexibility to replace thousands of existing single pipe and standard efficiency furnaces where the addition of an inlet air pipe would be difficult. The furnace includes a built-in electronic diagnostic system usable even when the furnace is running, multi-position quick conversion, and the ability to fit in tight places.

International Comfort Products, P.O. Box 128, Lewisburg, TN 37091;