A listed residential gas furnace with a straight run has a maximum flue temperature and a hood of less than 500 F. The chimney connector is singlewall metal pipe. The clearance from the connector to any non-combustibles must be at least:

A listed residential gas furnace with a straight run has a maximum flue temperature and a hood of less than 500 F. The chimney connector is singlewall metal pipe. The clearance from the connector to any non-combustibles must be at least: