Lennox Hearth Products CI1500DVF Series, Installation Instructions Manual

9

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

12

X

Roof Pitch is X/12

2 FT

MIN.

2 FT MIN.

Lowest

Discharge

Opening

H*

*H = MINIMUM HEIGHT FROM ROOF TO

LOWEST DISCHARGE OPENING OF VENT

TERMINATION HEIGHTS FOR VENTS ABOVE

FLAT OR SLOPED ROOFS

Horizontal Overhang

Vertical

Wall

Vent

Termination

Storm Collar

Concentric

Vent Pipe

Flashing

1 inch (25.4 mm) Minimum

Clearance to Combustibles

The  vent/air  intake  termination  clearances 

above  the  high  side  of  an  angled  roof  is  as 

follows:

Roof Pitch.................. Feet 

Meters

Flat to 6/12 ................ 1.0 

0.3

6/12 to 7/12 ............... 1.25 

0.38

7/12 to 8/12 ............... 1.5 

0.46

8/12 to 9/12 ............... 2.0 

0.61

9/12 to 10/12 ............. 2.5 

0.76

10/12 to 11/12 ........... 3.25 

0.99

11/12 to 12/12 ........... 4.0 

1.22

12/12 to 14/12 ........... 5.0 

1.52

14/12 to 16/12 ........... 6.0 

1.83

16/12 to 18/12 ........... 7.0 

2.13

18/12 to 20/12 ........... 7.5 

2.29

21/12 to 21/12 ........... 8.0 

2.44

Figure 4

Figure 3

Vertical Vent Termination  Clearances

These instructions should be used as a guideline and do not supersede 

local codes in any way. Install vent according to local codes, these 

instructions, the current National Fuel Gas Code (ANSI-Z223.1) in the 

USA or the current standards of CAN/CSA-B149.1 in Canada.

Horizontal Vent Termination Clearances

The horizontal vent termination must have a minimum of 3" (76 mm) 

clearance to any overhead combustible projection of 2-1/2" (64 mm) 

or less. See 

Figure 4

.  For projections exceeding 2-1/2" (64 mm), For 

additional vent location restrictions refer to 

Figure 5

.

Side Elevation View

3"

(76 mm)

12"

(305 mm)

Horizontal T

Combustible Projection

greater than 2 1/2 inches in length

Horizontal Vent Termination Clearances

Combustible Projection

2 1/2

 inches or less in length

18"

(457 mm)

Ventilated

Soffit

Unventilated

Soffit

ermination Kit

3"

(76 mm)

1"

   (25 mm)

Note - See vent manufacturer's instructions for recess 

allowances,  into  exterior  walls  for  the  horizontal 

termination caps.

MANUFACTURED (MOBILE) HOME REQUIREMENTS

QUESTIONS TO ASK LOCAL BUILDING OFFICIAL

VENT TERMINATION CLEARANCES

These  models  may  be  installed  in  an  aftermarket  permanently 

located, manufactured home, where not prohibited by local codes. 

When installed in Manufactured Housing the following supplemental 

requirements must be met:

•   The appliance must be secured to the floor (i.e. use (4) 1/4" x 2-3/4" 

bolts and nuts or equivalent. Note: Not included) for securing appliance 

to the manufactured home floor.

•   The appliance must be grounded to the chassis of the manufactured 

home. Use a No. 8 or heavier copper wire at least 18” in length.

•   The structural integrity of the manufactured home floor, walls, ceiling 

and roof must be maintained.

•  A manufactured (mobile) home installation must conform with the 

Manufactured Home Construction and Safety Standard, Title 24 CFR, 

Part 3280, or, when such a stan-dard is not applicable, the Standard 

for  Manufactured  Home  Installations,  ANSI  /  NCSBCS  A225.1,  or 

standard for Gas equipped Recreational Vehicles and Mobile Housing, 

CSA Z240.4.

This appliance must be installed per manufacturers’ instructions.

Installations must conform to appropriate local codes and applicable state 

and federal requirements.  Familiarity with these requirements before 

installation is essential.  Some important considerations to discuss with 

local building officials include: 

1. Applicable codes (i.e. Uniform Mechanical Code, State or Regional 

Gas Codes, National Fuel Gas Code)

2. Local amendments

3. Recognized  testing  lab:  OMNI-Test  Laboratories  Inc.;  Beaverton, 

Oregon

4. Is a permit required - cost?

5. In some states or municipalities, a licensed gas fitter or plumber may 

be required to install this appliance.  Check with your local building 

official for requirements in your area (i.e. Is a license required for 

installation of gas supply line)?

6. Maximum amount of gas pipe without a pressure test - type of test 

required?

7. Are below grade penetrations of the gas line allowed?

8. Is concealed gas piping allowed?

9. Specific requirements of concealed fittings?

10. Is rigid pipe to appliance required?

11. Allowed piping materials?

12. Shut-off valve required within 4 feet of the firebox?

13. May the shut-off valve be concealed?

14. Rooms where the installation is not allowed?

In the absence of local codes, installation should conform to National 

Fuel Gas Code, ANSI Z223.1 / NFPA 54-Latest Edition in the USA or 

National Fuel Gas Code, 

CAN/CSA-B149.1

-Latest Edition in Canada.