Osburn Stoves by SB I HYBRID-45 MF ユーザーズマニュアル

The longer the run of pipe in your installation, the more restriction 
there is in the system. Therefore, larger diameter pipe should be 
used. 

• 

Use 4” pipe if you have more than 15 feet of Equivalent Vent 
Length (EVL). 

• 

Horizontal runs shall not exceed 10 feet of EVL. 

• 

To calculate EVL, use the following conversions table: 

1 

90° elbow or “T” 

5 

1 45° 

elbow 

3 

1 ft 

Horizontal pipe run 

1 

1 ft 

Vertical pipe run 

0.5 

NOTE: At altitudes above 3,000 feet, we suggest the use of 4” 
diameter vent at an EVL of 7 feet or more. 

Here is an exemple on how to calculate the EVL of your installation.  
(See Figure 8) 

(3 x 4’ of vertical length = 12’ x 0.5 = 6 EVL) + (1 x elbow or "T" = 5 
EVL) + (2 x 1’ of horizontal length = 2 EVL) 

Total EVL = (6 + 5 +2) = 13.  So 3” diameter vent is allowed 

A.  HORIZONTALLY THROUGH WALL     (refer to Figure 7 & 8) 
 
NOTE: Follow L-Vent chimney manufacturer’s instructions. 
 
1. 

Position stove, adhering to clearances shown in Figures 1 & 2. 

 
2.  Locate position of hole in wall; directly behind stove exhaust 

vent (refer to figure 4). 

 
3. 

Always maintain 3” clearance from combustible materials. 

 
4.  Install L-Vent wall thimble per L-Vent manufacturer’s 

instructions. 

 
5.  Attach enough piping to penetrate and extend at least 6” 

beyond exterior walls. An 8-foot vertical pipe run is suggested 
where possible to reduce the possibility of smoke spillage in 
the event of a loss of negative pressure. 

 
6.  Attach cap and seal outside wall thimbles with non-hardening 

waterproof mastic. 

Termination should not be located so that hot exhaust gases can 
ignite trees, shrubs, or grasses or be a hazard to children. Exhaust 
gases can reach temperatures of 500ºF and cause serious burns if 
touched. 

 

90 DEGREE ELBOW

45 DEGREE ELBOW

TERMINATION 
COLLAR

WALL
STRAP

FOLLOW CHIMNEY OR 
VENT MANUFACTURER'S 
INSTRUCTIONS

WALL

THIMBLE

CLEAN OUT
TEE

 

 

WALL
STRAP

CLEAN OUT
TEE

VERTICAL ROOF VENT

1' HORIZONTAL RUN EVL = 1'

FOLLOW CHIMNEY OR 
VENT MANUFACTURER'S 
INSTRUCTIONS

1' HORIZONTAL RUN EVL = 1'

90° ELBOW "T" LEE = 5'

VERTICAL LENGTH 4' EVL = 4 X 0.5' = 2'

VERTICAL LENGTH 4' EVL = 4 X 0.5' = 2'

VERTICAL LENGTH4' EVL = 4 X 0.5' = 2'

COUPE-FEU

MURAL

 

 

 

Locate terminations: a) not less than 3 feet above any forced 
air inlet located within 10 feet; b) not less than 4 feet below or 
horizontally from, or one foot above, any door, window or 
gravity air inlet into any building; c) not less than two feet from 
an adjacent building and not less than 7 feet above grade 
when located adjacent to a public walkway. Mobile home 
installations must use a spark arrester.