Lennox Hearth 775 User Manual

Page 6

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Roof Pitch is X/12

2 FT
MIN.

2 FT MIN.

Lowest

Discharge

Opening

*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

MANUFACTURED (MOBILE) HOME
REQUIREMENTS

These models may be installed in an after-
market 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 fl oor

(i.e. use (4) ¼” x 2 ¾” bolts and nuts or
equivalent. Note: Not included) for securing
appliance to the manufactured home fl oor.

• 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 fl oor, 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 Manufac-
tured Home Installations, ANSI / NCSBCS
A225.1, or standard for Gas equipped
Recreational Vehicles and Mobile Housing,
CSA Z240.4.

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.

VENT TERMINATION CLEARANCES

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/CGA-B149.1 and
-B149.2 in Canada.

Side Elevation View

QUESTIONS TO ASK LOCAL BUILDING
OFFICIAL

This appliance must be installed per manu-
facturers’ instructions.

Installations must conform to appropriate

local codes and applicable state and federal
requirements. Familiarity with these require-
ments before installation is essential. Some
important considerations to discuss with
local building offi cials 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 Labora-

tories Inc.; Beaverton, Oregon

4. Is a permit required - cost?
5. In some states or municipalities, a licensed

gas fi tter or plumber may be required to
install this appliance. Check with your local
building offi cial 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. Specifi c requirements of concealed fi t-

tings?

10. Is rigid pipe to appliance required?
11. Allowed piping materials?
12. Shut-off valve required within 4 feet of the

fi rebox?

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/CGA-
B149-Latest Edition in Canada.

(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

(76 m

(25 mm

Note - See vent manufacturer's instructions for recess
allowances, into exterior walls for the horizontal termi-
nation caps.