Monessen Hearth 624WBPF User Manual

14

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 15.

2.  Install the first elbow by placing the extended flue into the mating part of the fireplace or chimney sec-

tion.  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 in-

stalled.

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, a firestop spacer should be 
installed to provide the firestop and support required.  Be sure proper spacing in maintained between the 
chimney and combustibles.

3’

Min.

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single story offset

Storm 
Collar

Flashing

Roof

Refer to Table 1 
for Roof Opening 
Size

Attic 

Space

17” x 17” Opening

2” Min. Air Space 
Clearance to 
Combustibles

Fasten Support 
Straps Securely

30° Elbows

FP2353

Continue chimney to proper 
height and install round chim-
ney cap or chimney housing

FP2354
multi story offset

Continue chimney through roof 
and install round chimney cap 
or chimney housing

Firestop Spacer 2” Minimum 
Air Space Clearance at Joist

Vertical Chimney 
Enclosure

Chimney Must Be Enclosed 
in Accessible Areas

Firestop Spacer

Diagonal 
Chimney 
Enclosure

RISE

Firestop 
Spacer 2” Air 
Space Clear-
ance to Com-
bustibles

Note: Four (4) elbows may be 
used when total installation height 
exceeds 24 ft.

Maximum four (4) elbows per 
Fireplace

Offset Max 10’

Support Straps

Diagonal Chimney 
Enclosure

Vertical Chimney Enclo-
sure Recommended.
Diagonal Chimney En-
closure Acceptable

Fasten All Support 
Straps Securely

Vertical 
Chimney 
Enclosure

Support Straps 
Not to Penetrate 
Firestop

FP2354