1 Scope

1.1 These requirements cover electrically operated damper assemblies, that are intended for installation in the vent or chimney connector of automatically operated oil-fired appliances employing an atomizing type oil burner. The damper assembly is intended to restrict or block the connector opening when the burner is not firing.

1.2 These requirements cover automatic vent or chimney connector dampers for oil-fired appliances having a flue gas temperature not in excess of 538�C (1000�F), unless marked for a lower temperature. See 5.1.1, 20.5.1, and 33.1(d).

1.3 The vent or chimney connector dampers covered under these requirements are not for use on oil-fired appliances that employ vaporizing type oil burners.

1.4 Automatic vent or chimney connector dampers are intended for installation in accordance with the following standards of the National Fire Protection Association:

a)    Oil-Burning Equipment, NFPA 31.

b)    Chimneys, Fireplaces, and Vents, NFPA 211.

c)    National Electrical Code, ANSI/NFPA 70.

Summary of Topics

This revision to UL 17 is being issued to remove the reference to the withdrawal date of UL 873 and to address universal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to UL’s STP process.