LEWISBURG, TN — The 90% AFUE Tempstar PS90 gas furnace is certified for use in single-pipe installations that draw combustion air from within the conditioned space, according to a statement from International Comfort Products (ICP), headquartered here.

The non-direct venting gives dealers the flexibility to replace thousands of existing single-pipe and standard-efficiency furnaces where addition of an inlet air pipe would be difficult, according to ICP.

Mike Eberlein, product manger, said eliminating the requirement for a separate air intake pipe simplifies the vent installation, reduces the amount of piping materials required, and reduces the number of holes the contractor must cut through the structure.