Venting - Lennox Merit Series Installation Instructions Manual

The Lennox Merit Series™ unit is shipped standard for top flue discharge. A flue adapter is supplied with the furnace. It must
be installed on the outside of the furnace.
FLUE TERMINATION
CLEARANCES
Figure 1
Ref. Item
A Below eaves, balconies and other projections:
• Appliances up to 50 Mj/h input
• Appliances over 50 Mj/h input
B From the ground, above a balcony or other surface*
C From a return wall or external corner*
D From a gas meter (M) (see 4.7.11 for vent terminal location of regulator)
E From an electricity meter or fuse box (P)
F From a drain pipe or soil pipe
G Horizontally from any building structure* or obstruction facing a terminal
H From any other flue terminal, cowl, or combustion air intake*
J Horizontally from an openable window, door, non-mechanical air inlet, or any other
opening into a building with the exception of sub-floor ventilation:
• Appliances up to 150 Mj/h input
• Appliances over 150 Mj/h input up to 200 Mj/h input
• Appliances over 200 Mj/h input
• All fan-assisted flue appliances, in the direction of discharge
K From a mechanical air inlet, including a spa blower
N Vertically below an openable window, non-mechanical air inlet, or any other opening
into a building with the exception of sub-floor ventilation:
• Space heaters up to 50 Mj/h input
• Other appliances up to 50 Mj/h input
• Appliances over 50 Mj/h input and up to 150 Mj/h input
• Appliances over 150Mj/h input
*Unless appliance is approved for closer installation
NOTES:
1. All distances are measured to the nearest part of the terminal.
2. Prohibited area below electricity meter or fuse box extends to
ground level.
3. See Clause 5.13.6.6 for restrictions on a flue terminal under a
covered area.
6

VENTING

4. See Appendix J, Figures J2(a) and J3(a), for clearances required from a
flue terminal to an LP Gas cylinder. A flue terminal is considered to be a
source of ignition.
5. For appliances not addressed above, approval shall be obtained from
the Authority.
Minimum clearances mm
Natural draft Fan assisted
300 200
500 300
300 300
500 300
1000 1000
500 500
150 75
500 500
500 300
500
1500 300
1500 500
1500 1500
1500 1000
150 150
500 500
1000 1000
1500 1500