Lennox Hearth manual INSTALLATION - MODEL L20 DVF-2ONLY, MODELS L20 BF-2AND L20 DVF-2

INSTALLATION - MODEL L20 DVF-2 ONLY

Direct Vent Retrofit Of Existing Chimney System - An existing Class-A (wood-burning) Metal Chimney or Masonry Chimney can be converted to a direct vent system. Use one of the following chimney conversion kits listed below. Have the existing chimney system inspected by a professional prior to the conversion. If using Simpson Dura-Vent brand liner kit, see “IMPORTANT” note at the top of page 8. The chimney conversion should not be applied to the portion of the vent system that is in the room of the appliance. Use only Co-Axial direct vent pipe (4” inner pipe, 6 5/8” outer pipe as listed on page 8) from the appliance to the retro-connector into converted flue system. Adhere to all specifications shown on pages 6 and 7 regarding clearances to combustibles, vertical and horizontal vent length minimums and maximums, etc. Read all instructions in this manual and provided by vent manufacturer with kit carefully before starting the installation. Failure to follow the instructions may create a fire or other safety hazard, and will void the warranty.

Model #	Brand: SECURITY / Description	Model #	Brand: SIMPSON DURA-VENT / Description
SV4MCK	Masonry Chimney Conversion Kit –Vertical term. Cap,	934	Masonry Chimney Conversion Kit
	cap adapter, masonry cover, black adapter (to flex), 2
	gear clamps
SV4CCK1	Factory Built Chimney Conversion Kit – for 6” I.D., 1”	931	Factory Built Chimney Conversion Kit A – for 6”
	insulation.		I.D.; Only compatible w/specific brands – Contact
			Vent Manufacturer
SV4CCK2	Factory Built Chimney Conversion Kit – for 7” I.D., 1”	932	Factory Built Chimney Conversion Kit B – for 6”, 7”
	insulation; 8” I.D., 1” insulation; 6” I.D., 2” insulation.		& 8” I.D.; Only compatible w/specific brands –
			Contact Vent Manufacturer
SV4CCK3	Factory Built Chimney Conversion Kit – for 10” I.D., 1”	933	Factory Built Chimney Conversion Kit C – for 7” &
	insulation; 7” I.D., 2” insulation; 8” I.D., 2” insulation.		8” I.D.; Only compatible w/specific brands – Con-
			tact Vent Manufacturer

MODELS L20 BF-2 AND L20 DVF-2

VERTICAL VENT TERMINATION REQUIREMENTS

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.

Terminate multiple vent terminations according to the installation codes listed above.

Terminate single vent caps relative to building components according to the following chart & illustration. The vent/air intake termina- tion clearances above the high side of an angled roof is as shown in the following chart:

Termination Heights For Vents

Above Flat or Sloped Roofs

Horizontal Overhang

Roof Pitch	Feet	Meters
Flat to 6/12	1	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	0.61
9/12 to 10/12	2.5	0.76
10/12 to 11/12	3.25	0.99
11/12 to 12/12	4	1.22
12/12 to 14/12	5	1.52
14/12 to 16/12	6	1.83
16/12 to 18/12	7	2.13
18/12 to 20/12	7.5	2.29
20/12 to 21/12	8	2.44

•Venting terminals shall not be recessed into a wall or siding.

•Ref. NFPA 54 / ANSI Z223.1, 7.6, fig. 13: Gas Vent Termination locations for listed Caps, 12 inches or less in size, at least 8 feet from a vertical wall.

2 Ft. Min.

Vent

Termination

Storm

Collar

Flashing

Concentric Vent Pipe

2 Ft. Min.

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.

PAGE 9