Lennox Bella Installation And Operation Manual page 14

Chimney Height Requirements - Site Built Residential Home
The vent termination height required is - USA, 1-foot minimum; Canada
3-feet minimum above the roof penetration point as illustrated below (Ref.
USA - National Standard, NFPA 211-latest edition and Canada National
Standard CSA B365-01-latest edition. Check with your local building
official for additional requirements for your area.
Termination Cap
Must Be Listed To
UL 641 or ULC S609
Termination height is
measured above the
highest point where
it passes through the
roof surface.
Figure 16
-
Site Built Residential Home Chimney Height Requirements
Chimney Height Requirements - Manufactured Homes
The chimney must extend 3 feet (.92m) above the level of roof penetra-
tion and a minimum of 2' (.61m) higher than any roof surface within 10
feet (3m) (see Figure 17). Check with your local building officials for
additional requirements for your area.
Requires A Listed Termination Cap *
Less than
10 Feet (3 m)
3 Feet (914 mm)
Minimum
m = meter
mm = millimeter
Figure 17
- Manufactured Home Chimney Height Requirements
14
USA 1 Foot Minimum
CANADA 3 Feet Minimum
Top Of Flue Must Be
Top Of Flue Must Be '
3' Higher Than High-
Higher Than Any Part Of
est Point Of Roof
Roof Within 10' Horizontal
Penetration
2 Feet (610 mm) Min.
10 Feet
(3 m)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
To pass inspection in nearly any jurisdiction, the chimney must meet both
safety and exhaust flow requirements. The (3' by) 2' by 10' rule applies
to both masonry and factory-built chimneys.
* Ref. USA - National Standard, NFPA 211-latest edition and Canada
National Standard CSA B365-01-latest edition. Vents installed with a
listed cap shall terminate in accordance with the terms of the cap's
listings.
Termination When Connected to Masonry Chimney or Existing
Class A Chimney
A flexible corrugated chimney liner has much greater resistance to the
flow of flue gases than does a rigid liner. For this reason we recommend
that a larger, 4" liner be used on vertical runs exceeding 15 feet or that
rigid venting be used. See Figure 18.
If a flexible corrugated chimney liner is used, it must be fully extended
to eliminate any sagging and to improve the exhaust flow.
1' Section of PL Vent
(listed to UL 641 or
ULC S609)
3" or 4" liner
(listed to UL 1777
or ULC S635)
Figure 18
- Existing Chimney Terminat
3 Feet
(914 mm)
Min.
Listed Pellet Vent
Termination Cap
Chase Cover
Termination When
Connected to Masonry
Chimney or Existing
Class A Chimney
ion