Desa ICBO# 3507 Owner's Operation And Installation Manual

Also see for G42: Owners manual and installation manual

Contents

www.desatech.com 109493-01K6HEARTH ExTENSIONA hearth extension projecting a minimum of 20"in front of and a minimum of 12" beyond eachside of the fireplace opening is required to protectcombustible floor construction in front of the fire-place. Fabricate a hearth extension using a materialwhich meets the following specifications: a layerof noncombustible, inorganic material having athermal conductivity of K=0.84 BTU IN/FT, HR.F (or less) at 1" thick. For example, if the materialselected has a K factor of 0.25, such as glass fiber,the following formula would apply:0.25 x 1.0" = 0.30" thickness required0.84Thermal conductivity "K" of materials can beobtained from the manufacturer or supplier of thenoncombustible material. If the hearth extensionis to be covered, use noncombustible material suchas tile, slate, brick, concrete, metal, glass, marble,stone, etc. Provide a means to prevent the hearthextension from shifting and seal gap between thefireplace frame and hearth extension with a non-combustible material (see Figure 3).WARNING: Hearth extensionis to be installed only as shownin Figure 3.Fireplace inSTallaTionContinuedFigure 3 - Hearth ExtensionSeal GapFireplace FrontEmber ProtectorFireplace FrontRaised HearthFireplace FrontElevatedEmber ProtectorEmber ProtectorSeal GapHearthExtensionMANTELSA mantel may be installed if desired (see Figure 4).Woodwork such as wood trims, mantels or any othercombustible material projecting from the front facemust not be placed within 12" of the fireplace open-ing. Combustible materials above 12" and projectingmore than 1 1/2" from the fireplace must not be placedless than 15" from the top opening of the fireplace(NFPA STD 211, Sec. 7-3.3.3).Mantels or any other combustible material alsomay come up to the side edge of the black metalface of the fireplace just as long as the projectionfrom the front face fall within the limit shown inFigure 4.1 1/4" Ref.15" Min.1" Min.11/" Max.3" Nom.33°CombustibleMaterialSafeZone forProjection ofCombustibleMaterialsFireplaceOpeningUpperSection ofFireplaceFigure 4 - Mantel Clearances toCombustible MaterialFIREBOXSAFE ZONETop View of Fireplace3" Max.4.5"Min. toPerpendicularSide Wall1"7.75"33°CombustibleMaterial MustNot OverlapFront Face6"Ref.