These requirements apply to manually fueled@ solid-fuel-fired central furnaces. Included are supplementary central furnaces intended for interconnection with forced-air central furnaces utilizing other fuels@ and combination oil-fired and solid-fuel-fired@ forced-air central furnaces. The furnaces are intended to burn solid fuels@ such as wood@ coal@ or any other biomass fuel@ as specified by the manufacturer. The furnaces are intended for connection to chimneys for residential and building heating appliances in compliance with the Standard for Chimneys@ Fireplaces@ Vents@ and Solid Fuel Burning Appliances@ NFPA 211@ and intended for installation in compliance with the Standard for Installation of Warm Air Heating and Air Conditioning Systems@ NFPA 90B; and the National Electrical Code@ ANSI/NFPA 70; and applicable mechanical codes such as the BOCA National Mechanical Code@ the Standard Mechanical Code@ and the Uniform Mechanical Code. A product that contains features@ characteristics@ components@ materials@ or systems new or different from those covered by the requirements in this standard@ and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features@ characteristics@ components@ materials@ or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development@ revision@ and implementation of this standard.
UL 391-2010 history
1970UL 391-2019 Solid-fuel and combination-fuel central and supplementary furnaces
2014UL 391 BULLETIN-2014 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces (COMMENTS DUE: JUNE 9@ 2014)
2010UL 391-2010 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces (Fifth Edition)
2008UL 391 BULLETIN-2008 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces
2007UL 391 BULLETIN-2007 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces
2006UL 391 BULLETINS-2006 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces (08/11/2006 (2p); 02/24/2006 (14p))
2006UL 391-2006 UL Standard for Safety Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces (Fourth Edition)
1995UL 391-1995 Solid-fuel and combination-fuel central and supplementary furnaces
1991UL 391-1991 Solid-fuel and combination-fuel central and supplementary furnaces