Monessen Hearth WR500 Straight-Up Chimney Installation, Offset Installation, Cutting the Hole

Page 10

WR / WC Series Woodburning Fireplace

Straight-Up Chimney Installation

To mark the centerline of the flue, put the fireplace in final position and measure out from the wall: 9¹⁄₄" (235mm). Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this mark. (Fig. 11)

Using a plumb bob positioned directly over center point of fireplace flue collar, mark the ceiling to establish the chimney center point. (Fig. 11)

Offset Installation

In order to clear an obstruction, it may be necessary to offset chimney from vertical. This is accomplished by using MHSC elbows. Use the 30° Offset Elbow table on Page 6 to determine proper offset and parts required.

Each offset requires two (2) elbows. The second elbow

 

Chimney Centerline

Actual Centerpoint

 

956M"

 

(235mm)

 

Plumb Line

 

Plumb Bob

 

Imaginary Cen-

 

terpoint

 

FP556

Fig. 11

Locate centerline of chimney with plumb line.

is equipped with support straps. It is very important to install the second elbow in each offset as close to the ceiling or support as possible so that the elbow straps can be secured to framing members to help support the weight of the chimney.

Determine offset distance of your chimney arrangement from centerline of fireplace to centerline of chimney where it is to pass through ceiling.

Locate center point of the chimney on ceiling as though a straight up chimney arrangement is to be used. Mea- sure your offset dimension from straight up chimney center point on ceiling.

Ceiling Chimney Hole/

Possible Obstructions

The size of the hole in ceiling will vary with the angle at which the chimney passes through ceiling.

Drive a nail up through ceiling at marked chimney cen- ter point. Go to floor above and see where hole will be cut. Check to see where existing ceiling joists and other possible obstructions are located...i.e. wiring, plumbing etc... If necessary, reposition chimney and/or fireplace to avoid obstructions.

Cutting the Hole

Cover fireplace collar opening and cut proper sized chimney hole in chimney. The SK8 pipe allows you to run pipe through a typical 16” on center joist without cutting joists.

Framing the Ceiling Hole

Frame the ceiling chimney hole as shown in Figure

12.It is good practice to use framing lumber that is the same size as the ceiling joists; this is a requirement at attic level.

Existing

AB

AB

Ceiling Joist

 

 

Chimney Hole

Ceiling

New

Framing Members

A"SK"Series framing=1456O" X 1456O" (368 x 368mm)

B "S" Series framing =1756O" X 1756O" (445 x 445mm)

Fig. 12 Typical frame for ceiling chimney hole.

FP551

10

20014528

Image 10
Contents WR/WC Series Safety Information Table of ContentsWR400 Series Woodburning Fireplace WR500 Series Woodburning Fireplace Chase Installation Front Width Back Width DepthRise 30˚ Elbow OffsetsIllustration Key OffsetPlanning the Chimney Run Planning InformationMounting the Fireplace Ten Foot RuleChimney Supports InstallationChase Installation Insulating Fireplace Enclosure For Cold ClimatesChimney Setup Installing Electrical Wire For Circulator ModelsInstall Fan Kit Assembly FramingCeiling Chimney Hole Possible Obstructions Straight-Up Chimney InstallationOffset Installation Cutting the HoleInstalling the Chimney System Positioning, Safety Strips Securing the FireplaceInstalling Outside Air Kit Angle of Chimney at CeilingAttic Installation Ceiling Installation Installing the Firestop Spacer Ceiling HoleProper Firestop Spacer Installation Canadian Requirements For Insulation ShieldAdditional Ceilings Continue Installing Pipe to Complete RunInstall Remainder of Chimney Sections Penetrating the RoofInstalling Chimney In a Chase Installing Top Housing or TerminationFinishing Finish Wall Top View MaterialFor On-Site Construction Side Wall Protection Hearth InstallationMinimum Wall Clearances Noncombustible Surround FacingSide View EH2416 458Installing Line for Gas Logs Fireplace Top ViewWR400/500, WC400/500 Series Description WR/WC400 WR/WC500Accessories Accessory Description Model NumberChimney Components CCE-SK AIS-SKWhat is Not Covered Limitations and ExclusionsMhsc