CFM Corporation ODSHR42 Planning Information, Mounting the Fireplace, Planning the Chimney Run

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ODSHR Outdoor Woodburning Fireplace

Planning Information

Preplanning an installation is very important to ensure

safety and to save time and money. An installer must

predetermine where a fireplace will be set and how the chimney system will be run.

Mounting the Fireplace

A fireplace may only be mounted on the following sur- faces:

1.A flat combustible surface.

2.A raised wooden platform.

3.A concrete block or other solid object placed beneath each of the four (4) corners of the fireplace.

The fireplace must be spaced 3/4" (19 mm) from a combustible back wall and 3/4" (19 mm) from a com- bustible side wall or support. (Fig. 20, Page 14)

Planning the Chimney Run

Determine how the chimney will be run, length of run and chimney components required to complete the job. (Fig. 7) Never install a chimney below minimum heights.

L

 

T

11CF

Total

Installed

 

 

Chimney

Length

Length

 

 

 

Model No.

(LT)

(L1)

 

 

 

 

 

 

L

 

1

11CF1

�����"

�����"

 

 

 

 

11CF18

�����"

�����"

 

 

 

L

 

1

11CF3

�����"

�����"

 

 

 

11CF4

�����"

�����"

 

 

 

 

 

 

FP288b

 

 

 

 

 

Fig. 7 Installed lengths of chimney sections.

In planning a chimney system, it is important to know:

1.The height of a chimney is measured from the hearth to the exit point on the termination.

2.A chimney cannot be offset more than 30° from a vertical plane.

3.A chimney may run straight up or it may be neces- sary to offset it to avoid obstructions.

4.The maximum length of an angled run (total chimney system) is 20' (6 m).

5.No more than 2 offsets (4 total 30° elbows in) per fireplace may be used.

6.A guy wire stabilizer is required for chimneys extend- ing more than 6' (1.8 m above a roof line.

The Ten Foot Rule

Major U.S. building codes specify a minimum chimney height above the roof top. The “Ten Foot Rule” is a fire safety rule and not a draft rule. To ensure proper draft, it is recommended that you always meet or exceed the “Ten Foot Rule,” especially when installing a termina- tion on a high pitch roof. (Fig. 8)

The key points of the "Ten Foot Rule" are:

1.If the horizontal distance from the chimney to the peak of the roof is 10' (3 m) or less, the top of the chimney must be at least 2' (610 mm) above the peak of the roof, but never less than 3' (914 mm) in height above the highest point where it passes through the roof.

2.If a horizontal distance from the chimney to the peak of the roof is more than 10' (3 m), a chimney height reference point is established that is on the surface of the roof a distance of 10' (3m) from the chimney in a horizontal plane. The top of the chimney must be at least 2' (610 mm) above the reference point, but never less than 3' (914 mm) in height above the highest point where it passes through the roof.

 

0 To 10'

 

 

2' Min. 3'

0 To 10'

 

Min.

 

 

 

2' Min. 3'

 

 

Min.

 

Reference

 

 

Point

 

 

 

AC246

Fig. 8

Ten Foot Rule illustration.

 

20002264

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Contents Odshr Series Table of Contents Safety Information Front Width Back Width Depth ODSHR42 Series Woodburning FireplaceExterior Chase Installation InstallationInterior Chase Illustration Key 30˚ Elbow OffsetsTen Foot Rule Planning InformationMounting the Fireplace Planning the Chimney RunInsulating Fireplace Enclosure for Cold Climates InstallationChase Installation Chimney SupportsChimney Set-Up Straight-Up Chimney InstallationOffset Installation FramingAngle of Chimney at Ceiling Cutting the HoleFraming the Ceiling Hole Chimney Hole SizeInstalling Outside Air Kit Positioning, Safety Strips Securing the FireplaceAttic Installation Ceiling Installation Installing the Chimney SystemInstalling the Firestop Spacer Ceiling Hole Proper Firestop Spacer InstallationInstalling Chimney In a Chase Continue Installing Pipe to Complete RunInstall Remainder of Chimney Sections Installing Top Housing or TerminationAir Space Clearances Finish WallFront View Side View Mantel clearances Mantel Clearance No Noncombustible Facing MaterialSide Wall Protection Hearth InstallationExamples of wall shield insulation Example for Common Brick Example of Determining Hearth Extension EquivalentsGas line access Installing Line for Gas LogsDescription Part Number Odshr Outdoor Woodburning FireplaceAccessory Description Model No AccessoriesFirebox Record RLTCF11LOdshr Outdoor Woodburning Fireplace Liners Refractory or Metal For Majestic Fireplaces PRE-ENGINEERED Fireplace SystemsFiregrate, Glass Doors, Outside Air System Fan MotorCFM Corporation