CFM Corporation SHR36 Planning Information, Mounting the Fireplace, Planning the Chimney Run

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SHR Series Woodburning Fireplaces

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 inch from a combus- tible back wall and 3/4 inch from a combustible 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. 6) 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 degrees 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 feet.

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 feet 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 termination 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' (3m) or less, the top of the chimney must be at least 2' (610mm) above the peak of the roof, but never less than 3' (914mm) 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' (3m), 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' (610mm) above the reference point, but never less than 3' (914mm) in height above the high- est 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.

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Contents SHR Series Table of Contents Safety InformationSHR36 Series Woodburning Fireplace SHR48 Series Woodburning Fireplace Chase Installation 30˚ Elbow Offsets Chimney Requirements Offset InstallationsIllustration Key Ten Foot Rule Planning InformationMounting the Fireplace Planning the Chimney RunInsulating Fireplace Enclosure for Cold Climates InstallationChase Installation Chimney SupportsFraming Firebrick InstallationChimney Set-up Cutting the Hole Straight-Up Chimney InstallationOffset Installation Ceiling Chimney Hole Possible ObstructionsInstalling Outside Air Kit Positioning, Safety Strips Securing the FireplaceInstalling the Firestop Spacer Ceiling Hole Installing the Chimney SystemProper Firestop Spacer Installation Penetrating the Roof Continue Installing Pipe to Complete RunCanadian Requirements For Insulation Shield Additional CeilingsCut and Frame Roof Hole Install Remainder of Chimney SectionsInstalling Top Housing or Termination Installing Chimney in a ChaseMantel clearance Facing on fireplace surround flush with finished wall Example for Common Brick Hearth InstallationSide Wall Protection Example of Determining Hearth Extension EquivalentsMinimum Wall Clearances Minimum Hearth Extension DimensionsSealing detail Installing Line for Gas LogsSHR36/42A/48/52 Woodburning Fireplace Accessory Description Model No AccessoriesSLTCF11 For Majestic Fireplaces PRE-ENGINEERED Fireplace Systems Limited Warranty & 30 Year Protection PlanCFM Corporation