Lennox Hearth 775 manual 11

Installing Support Brackets

Direct Vent Retrofit Of Existing Chimney System

Install support brackets per vent manufacturers instructions.

An existing

Class-A (wood-burning) Metal Chimney or Masonry

Chimney can be converted to a direct vent system. Use one of the

Vertical Vent Installation

following chimney conversion kits listed below. Have the existing

chimney system inspected by a professional prior to the conversion.

Support Bracket Placement Diagram

If using Simpson Dura-Vent brand liner kit, see ÒIMPORTANTÓ note

at the top of page 12. The chimney conversion should not be applied

Support

to the portion of the vent system that is in the room of the appliance.

Brackets

Wall

Use only Co-Axial direct vent pipe (4Ó inner pipe, 6 5/8Ó outer pipe

Stud

as listed on page 12) from the appliance to the retro-connector into

converted ßue system. Adhere to all speciÞcations outlined in this

manual 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

Placement:

starting the installation. Failure to follow the instructions may create

1 inch

a Þre or other safety hazard, and will void the warranty. The following

Horizontal Runs - Requires

minimum

Vent System components may be safely used with this appliance.

a support bracket every 5

feet (152 cm).

8 feet

Chimney DV Liner Kits

Vertical

Runs

-

Requires

Model

Brand: SECURITY SECURE VENT / Description

support

brackets

every 8

SV4MCK

Masonry Chimney Conversion Kit –Vertical term. Cap, cap adapter,

feet (244 cm)

above the

masonry cover, black adapter (to flex), 2 gear clamps

stove vent outlet..

SV4CCK1

Factory Built Chimney Conversion Kit – for 6” I.D., 1” insulation.

SV4CCK2

Factory Built Chimney Conversion Kit – for 7” I.D., 1” insulation; 8”

I.D., 1” insulation; 6” I.D., 2” insulation.

SV4CCK3

Factory Built Chimney Conversion Kit – for 10” I.D., 1”

insulation; 7” I.D., 2” insulation; 8” I.D., 2” insulation.

Model

Brand: SIMPSON DURA-VENT / Description

934

Masonry Chimney Conversion Kit

931

Factory Built Chimney Conversion Kit A – for 6” I.D.;

932

Factory Built Chimney Conversion Kit B – for 6”, 7” & 8” I.D.

Figure 15

933

Factory Built Chimney Conversion Kit C – for 7” & 8” I.D.

Table 7

Select Venting System - Horizontal Or Vertical

Horizontal Vent Installation

The following sections describe vertical (roof) and horizontal

Support Bracket Placement Diagram

(exterior wall) vent applications. Refer to the section relating to

Support

your installation. A list of approved venting components is shown

Building

on page 11 & 12.

Brackets

Horizontal / Inclined Run

Support

(¹⁄₄" Rise per Foot of Horizontal Run in the

Framing

Termination

Direction away from the Stove)

Shown

Vertical

Elbow

Vent Sections

Exterior

Ceiling

Horizontal

Vertical

Firestop/Spacer

Support Bracket Spacing

Wall

Rise

Every 5 ft (1.52 m)

Combustion

See figure for

Air

vertical vent

section support.

Exhaust

Figure 16

Figure 17

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

11