Chimney Offset Installation

ELBOW INSTALLATION

The 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.

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

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

8-PENNY NAILS PER STRAP

FIGURE 18

30˚ ELBOW

INLET AIR PIPE

FLUE PIPE

NOTE:

ALTHOUGH BOTH HALVES OF THE ELBOW SET MAY HAVE TIE STRAPS, ONLY THE TOP HALF MUST BE SECURED. THE BOTTOM ELBOW HALF IS NOT REQUIRED TO BE SECURED FOR ADDED STABILIZATION OF PIPE

3.The limitations on the quantity of elbows per chimney are as follows: If the total height of the fireplace and chimney is—12' - 2" 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.

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 Page 18.

2.Install the first LE30 elbow by placing the extended flue into the mating part of the fireplace or chimney section. Push down until the outside or inlet air duct of the elbow overlaps and the snaps lock the elbow into the fireplace or chimney section.

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 LF-FS-30 firestop spacer should be installed to provide the firestop and support required. Be sure proper spacing in maintained between the chimney and combustibles.

53D9036. Rev 1 03/03

HWB700HB specifications

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