Connecting Ductwork/Plenums Between "Add On" Furnace And Original Furnace - Napoleon HYBRID 150 Operating Instructions Manual

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○ Separate chimneys are recommended when connecting the HMF150 to a pre existing oil furnace. If a
single chimney is used in this application it must be 7" in diameter and approved for use with wood burning
appliances (2100°F).
○ The exhaust pipe from the wood fl ue must connect to the chimney below the junction of the oil
exhaust to the common chimney.
6.4.1 Controlling Draft
○ Whether the fl ue from the HMF150 wood furnace has a dedicated chimney or it shares a chimney
already in place for an existing oil fi red furnace the following conditions apply:
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CHIMNEY DRAFT GREATER THAN 0.06" W.C. MAY CAUSE AN UNCONTROLLABLE FIRE AND
6.5 CONNECTING DUCTWORK/PLENUMS BETWEEN "ADD ON" FURNACE AND
ORIGINAL FURNACE
IMPORTANT:
○ The warm air supply duct system shall be constructed of metal in accordance with NFPA 90B, 2-1.1.
○ The plenums installed to the furnace shall be constructed of metal in accordance with NFPA 9B, 2-1.3.
USE EXTREME CAUTION WHEN BUILDING PLENUM/DUCT WORK SYSTEMS SO AS NOT TO CREATE
A CONDITION WHERE HOT AIR CAN BE ENTRAPPED IN DUCT WORK, OR CREATING A REVERSE
FLOW CONDITION. WHERE HOT AIR WOULD FLOW BACKWARDS INTO THE COLD AIR RETURN
NEVER CONECT THE WARM AIR SUPPLY OUTLET OF THE "ADD ON" FURNACE TO THE COLD AIR
SUPPLY OF THE CENTRA (ORIGINAL) FURNACE. FAILURE TO COMPLY MAY RESULT IN DAMAGE
FOR MORE INFORMATION ON ALLOWABLE/PROHIBITED METHODS OF CONNECTING "ADD ON"
FURNACES TO A PRE EXISTING FURNACE SEE FIGURES 1 THROUGH 7 OF CAN/CSA-B366.1-M91.
W415-0910 / A / 09.16.10
The use of incline manual dampers are forbidden.
Barometric dampers will be installed where stack pressures exceed 0.06" w.c. but shall not
prevent a minimum of 0.04" w.c. for the chimney draft of the wood furnace.
The use of incline manual dampers are forbidden.
DAMAGE THE FURNACE.
PLENUM AND DUCTING.
TO PROPERTY AND CREATE A FIRE HAZARD.