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16 61D0087
FIRESTOP THIMBLE AND THIMBLE EXTENSION (CONTINUED)
3. For unventilated cathedral type ceiling on double-wide manufactured homes, the firestop thimble should extend through
both the ceiling and roof structures. See Figure 15.
4. Install first chimney section by inserting the male end of the flue (the smallest diameter pipe) into the flue collar of the
fireplace. Press down until the snap locks engage. Place the female end of the 11" diameter pipe on top of the fireplace
and press down until the snap locks engage. Continue this process, until the chimney is at least 8" to 16" above the
roof opening for installation of the Model SC Chimney Cap later. At this point, the chimney must not exceed 13½' road
clearance. This will allow the top section of chimney and chimney cap or chimney housing to be removed for moving
the manufactured home on the highway.
Note: If additional strength of the outer pipe joints is desired, place (2) or three (3) sheet metal screws
through the area where the outer pipes overlap one another. Install these screws by drilling a
1
/8"
diameter hole through the chimney sections.
Be very careful when drilling holes into
outer pipe. The drill must not penetrate
the inner stainless steel pipe.
WARNING
5. Make sure all joints of the chimney are tight. Check clearance between the chimney and combustible materials before
proceeding with installation of the roof flashing and chimney cap.
Figure 15 - Unvented Cathedral Type Ceiling
SVTR Firestop Thimble May Be
Trimmed Off Flush with Roof Line if
It interferes with Flashing
SVTR Firestop Thimble
(Swivels 0 to 15°)
• 7 ½° Pitch Requires 14½" x 14¾" Framed
Opening
• 15° Pitch Required 14½" x 15" Framed
Opening.
CHIMNEY INSTALLATION