Lennox Hearth 775 - Manual (Page 11)

11
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Direct Vent Retrofi t 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 12. 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 12) from the appliance to the retro-connector into
converted fl ue system. Adhere to all specifi cations 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
starting the installation. Failure to follow the instructions may create
a fi re or other safety hazard, and will void the warranty. The following
Vent System components may be safely used with this appliance.
Table 7
Figure 17
Model Brand: SECURITY SECURE VENT / Description
SV4MCK Masonry Chimney Conversion Kit –Vertical term. Cap, cap adapter,
masonry cover, black adapter (to flex), 2 gear clamps
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.
933 Factory Built Chimney Conversion Kit C – for 7” & 8” I.D.
Chimney DV Liner Kits 8 feet
1 inch
minimum
Support
Brackets
Wall
Stud
Installing Support Brackets
Install support brackets per vent manufacturers instructions.
Figure 15
Select Venting System - Horizontal Or Vertical
The following sections describe vertical (roof) and horizontal
(exterior wall) vent applications. Refer to the section relating to
your installation. A list of approved venting components is shown
on page 11 & 12.
Vertical
Horizontal
Combustion
Air
Exhaust
Placement:
Horizontal Runs - Requires
a support bracket every 5
feet (152 cm).
Vertical Runs - Requires
support brackets every 8
feet (244 cm) above the
stove vent outlet..
Vertical Vent Installation
Support Bracket Placement Diagram
Horizontal Vent Installation
Support Bracket Placement Diagram
Figure 16
Vertical
Rise
Elbow
Horizontal / Inclined Run
( ¹⁄₄" Rise per Foot of Horizontal Run in the
Direction away from the Stove) Termination
Shown
Firestop/Spacer
Vent Sections
Support Bracket Spacing
Every 5 ft (1.52 m)
See figure for
vertical vent
Support
Brackets Building
Support
Framing
Ceiling Exterior
Wall
section support.