Chimney Offset Installation

ELBOW INSTALLATION

Following are important points that should be observed when installing elbows on the fireplace:

1.The support straps of all elbows not installed directly on top of the fireplace should be nailed securely to the surrounding structure. This allows the support strap to carry the weight of the chimney above the elbow and prevents this weight from breaking the elbow or chimney sections apart. See Figure 18.

2.Elbows should not be used in any combination that inclines the chimney more than 30 degrees from vertical.

FIGURE 18

THE SUPPORT STRAPS OF ALL

ELBOWS NOT INSTALLED DIRECTLY

ON TOP OF THE FIREPLACE SHOULD

BE NAILED SECURELY TO THE

SURROUNDING STRUCTURE.

30∞ ELBOW

ALL FOUR SUPPORT STRAPS MUST BE NAILED TO FRAMING MEMBER AROUND THE ELBOW WITH A MINIMUM OF TWO (2)

8-PENNY NAILS PER STRAP.

INLET AIR PIPE

FLUE PIPE

3.The limitations on the quantity of elbows per chimney are as follows: If the total height of the fireplace and chimney is — 16' 0" or more — two elbows may be used in the chimney. 21' 0" or more — four elbows may be used in the chimney.

4.The inclined portions of chimneys that pass through living spaces likely to be used for storage should be enclosed to avoid contact with and possible damage to the chimney. The minimum air space of two inches between the chimney and enclosing materials must be maintained. Figures 20 and 21 illustrates elbow installations.

5.The length of the inclined portion of chimney between elbows must not exceed 6 feet when unsupported or 20 feet if the chimney is supported at six-foot intervals with support such as metal support straps.

6.When enclosing the elbows and inclined portions of the chimney, enclosing materials must be installed vertically to maintain the required two-inch minimum air space clearance to the chimney at the extremities of the offset. It is recommended that enclosing material not follow the inclined portions of the chimney.

OFFSET INSTALLATION SEQUENCE

1.Determine the location and amount of offset required, then select the combinations of chimney sections and elbows required from the offset chart. Refer to Table 2.

2.Install the first SE30 elbow by inserting the male end of the 8-inch diameter flue elbow into the mating part of the fireplace or chimney section and pressing down until the snap locks engage. Insert the female end of the 11-inch diameter outer elbow onto the mating part of the fireplace or chimney section and press down until the snap locks engage.

3.Nail the support straps to the framing member with a minimum of two 8-penny nails per strap.

4.Install the sections of pipe between elbows until the proper number of chimney sections have been installed.

5.Install the second elbow to return the run of the chimney to vertical.

6.Nail the support straps of the second elbow to a building frame member.

7.Continue installing the vertical portion of the chimney.

NOTE: If the inclined portion of the chimney passes through a floor or ceiling, an SF30 firestop spacer should be installed to provide the firestop and support required. Be sure proper spacing in maintained between the chimney and combustibles. See Figure 19.

53D9033. Rev 1 03/03

SWB400I specifications

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