DuraVent PolyPro Flex - Manual (Page 7)

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to permit proper access. If this is the case,
patch up the opening after the installation
is completed using best practices. The slope
of the rigid connecting flue pipe must have a
minimum of 3° (equivalent 5cm/m) (5/8" per
foot).
2. Fix the Flex Chimney Support
(Fig.4) with 4 screws on the wall of the
enclosure.
Figure 4, Mounting Flex Chimney Support
6. Install PP Flex liner into the enclosure. A
second person is required to help feed the
flexible liner into position (feeding either
from the top or bottom of the enclosure).
This will also help prevent damage from
occurring.
7. After installing the required length of liner,
remove the Flex Puller (if applicable)
8a. Position the Support Elbow on the Flex
Chimney Support (see 2 and 3, Fig.5)
8b. Secure the Support Elbow with the clamp
around the Flex Male Adapter and through
the slot of the Flex Chimney Support (see 1,
Fig.6).
Figure 5,
Installation
Support Elbow
Figure 6,
Securing
Support Elbow
1
2
3
1
3. The length of the flexible liner can be
determined in two ways: use a rope with
a weight to measure the shaft length, add
16" (40cm) extra length for each bend. The
flexible liner can be shortened with a saw or
scissors by cutting in a groove. The correct
length can also be determined after installing
the liner in the shaft and cutting it at the top
of the chimney, see Fig.8, dimension B.
4. Mount the Gasket into the flex pipe, and
attach to the appropriate coupler as detailed
above.
5. Mount the Spacers with a maximum
distance between them of 6 feet (2m).
9. Mount the Wall Plate on the wall of the
shaft (Fig.7). Pay attention to the correct
slope of 3°. The pipe of the Support Elbow
must be in the centre of the hole in the Wall
Plate.
10. The Support Elbow can be shortened if
required- For single wall, Dim A (Fig.7) must
have a minimum length of 1.6" (40mm).
11. At the top of the shaft, shorten the
flexible liner to the required length and make
sure that dimension B in Fig.8 is between 1½
- 2½" (between 38 and 64 mm).