Page 12
Figure 11. Free standing through a
masonry chimney installation
Figure 10. Free standing basement
installation
6. Venting System
6.1 Exhaust Vent Pipe Requirements
Your
KOZI
pellet heater works under negative pressure (vacuum). The exhaust fan of
your stove pulls air from the air intake, through the stove and pushes it out the venting.
As this air passes through the burn pot it is used to burn the pellets. Proper vent pipe
sizing is very important to the proper operation of your stove. A proper size ULC/UL
listed type PL or L venting should be used to provide the least resistance for movement
of the combustion air.
Your
KOZI
pellet heater is certified for 3 and 4 inch exhaust venting. 3 inch venting is
normally sufficient for most direct vent installations. Installations with several elbows,
long horizontal and/or vertical runs may add too much resistance to air flow and may
create burn problems. The use of 4 inch venting in these types of installations will reduce
the possibility of burn problems. A simple technique called ‘EQUIVALENT VENT
LENGTH (EVL)’ can be used to determine whether 3 or 4 inch vent pipe should be used.
To calculate EVL use the following formula:
for each 90° Elbow or T fitting
= add 5 EVL
for each 45° Elbow
= add 3 EVL
for each Horizontal run of vent
= add 1 EVL per foot of horizontal venting
for each Vertical run of vent
= add 1/2 EVL per foot of vertical venting
COMBUSTION AIR
INTAKE OR CHECK
VALVE
THIMBLE
TEE WITH
CLEAN OUT
BASEMENT FLOOR
MINIMUM 3" (76 mm)
MAIN FLOOR
EARTH
3"
76 mm
NON COMBUSTIBLE
FLOOR PROTECTOR
COMBUSTION AIR
INTAKE OR CHECK
VALVE
RAIN CAP
SEALED COVER
PLATE
TEE WITH
CLEANOUT
STAINLESS STEEL
SINGLE WALL PIPE
PIPE
SUPPORT
CAUTION: EVL CANNOT EXCEED 25 ft. (7.6 meters). Installations
using an EVL exceeding 25 ft. (7.6 meters) are not permitted.
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