Lennox Hearth MPD-40 Series Vertical Vent Termination Clearances, Roof Pitch Feet

VENT TERMINATION CLEARANCES

These instructions should be used as a guide- line 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.

Vertical Vent Termination Clearances

Terminate single vent caps relative to building components according to Figure 4.

TERMINATION HEIGHTS FOR VENTS ABOVE FLAT OR SLOPED ROOFS

Horizontal Overhang

	Horizontal Vent Termination Clearances
	Combustible Projection	All horizontal terminations
	2-1/2 inches or less in length	may be located as close
	Combustible Projection	as 6” (152mm) to any
		(non-combustible and
greater than 2-1/2 inches in length		combustible) exterior
		sidewall. This distance
Ventilated		may be decreased to
Soffit	Unventilated	2” (51mm) for non-
		combustible exterior
	Soffit
		sidewalls only, if the
	3"	SV4.5HT-2 termination
		is used.
	(76 mm)
18"	12"	Termination Kit
(457 mm)	(305 mm)
	Termination Kit

2 FT MIN.

Vent Termination

Storm Collar

Flashing

Concentric Vent Pipe

2 FT	Vertical
MIN.	Wall
Lowest
Discharge
Opening
H*
	X
	12
Roof Pitch is X/12

1 inch (25.4 mm) Minimum Clearance to Combustibles

*H = MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING OF VENT

Figure 5 - Side Elevation View

Horizontal Vent Termination Clearances

The horizontal vent termination must have a minimum of 3" (76 mm) clearance to any over- head combustible projection of 2-1/2" (64 mm) or less. See Figure 5. For projections exceed- ing 2-1/2" (64 mm), see Figure 5. All horizontal terminations may be located as close as 6"

Step 3. (page 9) Install the vent system and exterior termination.

Step 4. (page 22) Field Wiring

a. Millivolt Appliances – Install the operating control switch (not factory provided) and bring in electrical service line for forced air circulating blower (optional equipment).

Roof Pitch	H
	(feet)
Flat to 6/12	1.0
Over 6/12 to 7/12	1.25
Over 7/12 to 8/12	1.5
Over 8/12 to 9/12	2.0
Over 9/12 to 10/12	2.5
Over10/12 to 11/12	3.25
Over 11/12 to 12/12	4.0

Figure 4

Terminate multiple vent terminations accord- ing to the installation codes listed on this page.

(152mm) to any (non-combustible and com- bustible) exterior sidewall. This distance may be decreased to 2" (51mm) for non-combus- tible exterior sidewalls only, if the SV4.5HT-2 termination is used. For additional vent location restrictions refer to Figure 8 on page 7.

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation follows, however, each installation is unique resulting in variations to those described.

See the page numbers references in the follow- ing steps for detailed procedures.

Step 1. (page 6) Construct the appliance framing. Position the appliance within the framing and secure with nailing brackets.

Step 2. (page 6) Route gas supply line to appliance location.

b. Electronic Appliances – Field wire and install operating control switch.

Step 5. (page 22) Install blower kit (optional equipment).

Step 6. (page 23) Make connection to gas supply.

Step 7. (page 24) Install the logs, decora- tive volcanic stone and glowing embers.

Step 8. (page 24) Checkout appliance op- eration.

Step 9. (page 24) Install glass door frame assembly.

Step 10. (page 25) Adjust burner to ensure proper flame appearance.

Step 11. (page 25) Install the hoods.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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