6 Complete the Enclosure
A. Chimney Termination (2-10-3 Rule)
Chimney Termination Requirements (See Figures 25.1 and 25.2)
•Must have a cap approved and listed for this fireplace system
•Must not be located where it will become plugged by snow or other material
•Must terminate at least 3 ft (914 mm) above the roof and at least 2 ft (610 mm) above any portion of the roof within 10 ft (3.05 m)
•Must be located away from trees or other structures
Slanted Roofs
Chimney must extend 3 ft (914 mm) above the roof
Chimney must extend 2 ft (610 mm) above any portion of the roof
within 10 ft (3048 mm) of the chimney
Flat Roofs
Chimney must extend 3 ft (914 mm) above the roof
Chimney must extend 2 ft (610 mm) above any portion of the roof
within 10 ft (3048 mm) of the chimney
Figure 25.1 Termination Requirements
GAS, WOOD OR FUEL
OIL TERMINATION
GAS 
C TERMINATION
B
A
| Gas | Wood & Fuel Oil | Comments |
| Termination | Termination | |
|
| ||
|
|
|
|
A | 6 in. | 20 in. min. | Horizontal distance between terminations |
|
|
|
|
B | 20 in. | 24 in. min. | Distance to perpendicular wall |
C | 18 in. | 18 in. | Vertical distance between terminations |
|
|
|
|
Figure 25.2 Multiple Chimneys
September 1, 2008 | Heat & Glo • NorthStar EPA Fireplace • | Page 25 |