85-03-01071 D30 DEEP TIMBER Page 29
Venting
The D30 Insert must be vented vertically to the outside and must use one of the approved co -linear flexible
ducting systems or a coaxial flexible ducting system. Mendota recommends that both exhaust and air intake
flex liners be run all the way to the vent cap. Seals between flex liners and unit top and vent cap must be
permanent and as air tight as possible. Do Not Use any silicone sealants at flex pipe joints. Stove gasket
cements may be used at pipe joints but is not required. Do use both securing screws and hose clamps
at all four flex connection points.
Maximum and Minimum Vent Lengths
Minimum vent run length required is 10’. Maximum vent run
allowed is 50’. Only vertical terminations are allowed. No
horizontal runs are allowed within the vent system. Horizontal
offsets of less than 4’ are approved if the offset is angled at
least 30-degrees vertically.
Run Liners to Vent Cap
When existing wood burning chimney size allows, run both the
4” exhaust liner and 4” air intake liner to the vertical vent cap.
If existing wood burning chimney size is too small to run both
4” and 4” liners, consider converting to a coaxial flex system
using a 4” exhaust flex and 6” air intake flex with spring
spacers between the two flex pipes or converting to a B-Vent
single liner system.
Air Intake Liner Stubbing
When existing wood burning chimney, size is too small to run
both 4” and 4” colinear liners, it is an option to use the Coaxial
Vent Kit or to cut the air intake flexible duct short and run only
the 4” vent flexible duct to the vent cap connector. This is
generally called “stubbing”. However, understand that doing
so may lead to venting problems when weather storms
approach. Variations between the air pressure inside the home
and atmospheric air pressures outside the home can cause
venting problems and performance failures. Avoid “stubbing” if
chimney flue size allows installation of both liners fully to the vent cap; or consider using a coaxial vent system, instead.
MENDOTA RECOMMENDED VENT COMPONENTS AND VENT KITS LIST
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