NorthStar MSTOVEF CS550, User Manual

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3.) Exhaust system (venting).

Attention! Before cutting holes in your wall, make sure the stove is placed where you want it and check for electrical wires and 

plumbing pipes. Always check dimensions of stove and wall thimble before cutting hole in wall.  Cut holes between studs.  
Use a stud finder to check for studs.  Use a long 1/4 drill bit to drill a center point through both walls.  Use this center 
point to make sure the inside and outside wall holes line up.  

Do not install a flue damper in the exhaust venting system of this unit. 

A.) The entire exhaust system must be 3” or larger UL approved type “L” vent pipe. 
B.) The exhaust system must include the following components: 

a.) Pipe adapter (seal to exhaust outlet gas tight with high temperature RTV silicone sealant). 
b.) Cleanout Tee 
c.) At least 3 ft of vertical pipe. 
d.) Wall support every 4 ft of vertical pipe. 
e.) No more than 4 ft of horizontal pipe. 
f.) Minimum 3” clearance from exhaust pipe to combustibles. 
g.) Wall thimble for piping through combustible walls. 
h.) Horizontal chimney cap. 

C.) The exhaust piping must terminate outside at least 6 inches past the outer wall surface. 
D.) Determine equivalent length of exhaust piping.  Never exceed 20ft total equivalent pipe length.  If altitude is over 2000ft, 

do not exceed 15ft equivalent pipe length.  If altitude is over 4000ft, do not exceed 12.5ft equivalent pipe length. 

Component 

   Equivalent 

Length 

Sample 

Horizontal Straight Pipe 

# of feet  X  1.0 

=   

Horizontal Straight Pipe:  1 ft x 1 = 1 

Vertical Straight Pipe 

# of feet   X  0.5 

=   

Vertical Straight Pipe: 4 ft x .5 = 2 

90° Bend or Tee 

# of bends  X 

5 

= 

90° Bends: 1 x 5 = 5 

90° Bend or Tee 

# of tees  X 

5 

=   

Tees: 1 x 5 = 5 

45° Bend 

# of bends  X 

3 

= 

45° Bends: 1 x 3 = 3 

Total Length = 1 + 2 + 5 + 5 + 3 = 16 ft 

6" MIN

6" MIN

HORIZONTAL
CHIMNEY CAP

90° ELBOW

1FT STRAIGHT

SECTION (4X)

WALL SUPPORT

TEE

CLEANOUT

90° ELBOW

WALL SUPPORT

1FT STRAIGHT

SECTION (5X)

WALL THIMBLE

WALL THIMBLE

PIPE ADAPTER

PIPE ADAPTER

TEE

CLEANOUT

3" MIN

3" MIN

FIG00978

 
*Complete vent kit item #36624 available through NorthStar Customer service 1-800-270-0810 includes 
all parts shown on the left side of the installation diagram above (fig00978).