Osburn Stoves by SB I HYBRID 35 User Manual

 

90 DEGREE ELBOW

45 DEGREE ELBOW

TERMINATION 
COLLAR

WALL
STRAP

FOLLOW CHIMNEY OR 
VENT MANUFACTURER'S 
INSTRUCTIONS

WALL

THIMBLE

CLEAN OUT
TEE

 

Figure 15 

Venting through wall 

 

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

 

Figure 16 

Venting trough wall 

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

• 

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 example on how to calculate the EVL of your installation.  (See 
Figure 16) 

(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 

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.  Determine 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 go through and extend at least 6” beyond 

exterior wall. An 8-foot vertical pipe run is suggested where possible 
to reduce the possibility of smoke spillage caused by 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.

 

 

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.

 

 
 
 

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