Installation Guide

3
the chimney. Complete kits are avaliable (Tee,
Top Plate, and Flex). Connect only one
appliance per chimney liner. The size of the
liner should be the same as the appliance
outlet.
See complete flexible chimney liner instructions
L253 –
www.duravent.com/productdocumentsearch.aspx
Pressure Vent Into Masonry Chimney
TO ASSEMBLE DURAFLEX LINER
Attach tee without branch to liner flex then
wrap insulation around liner (see example),
then lower liner down masonry chimney to the
thimble area. If necessary, enlarge thimble to
accommodate fittings. If penerating a
combustible wall be sure to install an approved
wall penetration device.
The DuraFlex system is held in place by the top
plate which is designed to support the weight
of the system up to 50 feet.
ATTACH PROFOIL CERAMIC BLANKET TO
DURAFLEX LINER
Roll out the insulation blanket on a clean
surface, foil face down. Lay the flex liner on top
and trim the blanket so that it is about one foot
shorter than the liner.
Wrap the insulation around the liner lengthwise
and trim it so that a butt joint is formed. Seal
the joint with aluminum foil tape. Spray
adhesive may be used to hold the blanket in
place until it can be secured with the foil tape. A
minimum of ½ " of insulation is required. If a
double layer of blanket is needed, install it
with the butt joint on the opposite side.
Install ProMesh protective wire mesh over the
blanket(s). The ProMesh is used to protect the
ProFoil insulation as the liner is lowered into
the chimney. Slip the ProMesh over the
insulated liner and secure one end with a
stainless steel band clamp. Pull the ProMesh
towards the other end of the liner so that it
tightens snugly around the insulation, then trim
off the excess. Secure each end with a stainless
steel band clamp.
Attaching a Ceramic Blanket