Lennox Hearth II-T C FS, II-T C INS operation manual Venting Requirements, Installation

INSTALLATION

VENTING REQUIREMENTS

It is recommended that only an authorized dealer install your pellet stove. The specified installation requirements must be followed to ensure conformity with both the safety listing of the appliance and local building codes. All clearances, installation instructions and precautions specified by the vent manufacturer must be followed.

Selecting a Location (Freestanding Models) - Review the appliance clearance requirements before installing the venting system (see page 6). Position the appliance far enough away from walls to allow adequate room for servicing. Choose the appliance location with the least amount of interference with the house framing, plumbing, wiring, etc.

Preferred Vent Configuration - For the best perform- ance, we recommend a vent run design which runs verti- cally and terminates above the roofline. This design will allow natural draft to improve the flow of flue gases and will aid in combustion and stove performance.

Type of Pipe - This stove requires type “PL” vent pipe (pellet vent pipe, sometimes referred to as “L-Vent pellet vent”), listed to UL 641 or ULC S609. Connect the pellet vent pipe or the “tee” to the flue collar using a minimum of three screws and seal as specified in “Pipe / Liner Joint Requirements” on this page. Do not use class B gas chimney or single wall chimney as a substitute.

Size of Pipe - These pellet appliances are approved for use with the following vent sizes: 3” (75mm) standard, or 4” (100mm), see page 15 - for determining correct size vent). When 4” pipe is used: for horizontal vent installa- tions use a 3” (75mm) to 4” (100mm) adapter - available from vent manufacturer. For vertical installations use a 3” (75mm) to 4” (100mm) “tee” - available from vent manufacturer.

Note: If installation requires in excess of 11 feet (3 1/3 meter) of pipe, it is recommended that 4” (100 mm) pipe be used.

Offsets - In every installation, a single or double clean- out “tee” is recommended for every ninety-degree offset (this tee will help collect ash residue and will allow for routine cleaning without the need to disconnect sections of pipe). Note: Offsets and horizontal runs accumulate fly ash and soot which reduces the exhaust flow and per- formance of the stove.

Total Offsets in venting system should not exceed 270° total in direction change.

Horizontal Runs - The maximum total horizontal run must not exceed 10 feet (3.1 meters).

Horizontal run of pipe requires 1/4” (7 mm) rise per foot.

Pipe Clearances / Requirements - See pipe manufac- turers instructions for installation of venting components and clearances. Follow pipe manufacturers installation precautions for passing pipe through a combustible wall or ceiling (i.e. use an approved thimble). Note: Pellet vent pipe requires 3” (75mm) clearance from outside of pipe unless otherwise specified by vent manufacturer - all diameters: 3” (75mm) and 4” (100mm). A support bracket must be installed every 4’ (1.2m) of pellet vent pipe on the exterior wall of the house unless otherwise specified by vent manufacturer.

Pipe / Liner Joint Requirements - All pipe joints must be secured with a minimum of 3 screws. ALL horizontal joints must be sealed gas tight (air tight, sealed connec- tion). Use RTV high temperature silicone or Interam to provide a complete seal at the flue collar and on all joints.

Connection to Masonry Chimney through a Wall (Freestanding Models) - Be sure to verify the construc- tion of a masonry chimney, as it may have combustible framing.

Approved liner when relining Masonry or Factory Built Fireplaces is 2100HT (degree F.) liner listed to UL 1777 or ULC S635.

Connection to an Existing Class A Chimney (Free- standing Models) - A chimney adapter can be used to make the connection from 3” (75mm) or 4” (100mm) pel- let vent pipe (listed to UL 641 or ULC S609) to existing UL chimney system. Verify with the pipe manufacturer that your pipe brands will interconnect.

Horizontal-Vent Installations - On all horizontal-vent installations (short, horizontal runs with no vertical pipe); care should be taken when choosing a location for termi- nating the vent. It is not recommended to directly vent the exhaust on the prevailing wind side of the house. It is recommended that when an appliance is vented directly through a wall, a minimum of 8’ (2.5m) of vertical pipe should be installed to create some natural draft. This will reduce the possibility of smoke or odor entering the dwelling during appliance shutdown or loss of power.

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