Product Manual
7
Duct Work Installation
We strongly recommend that the hot air ductwork
be installed by a home heating specialist. If doing the
installation yourself, before you decide which installation will
best suit your needs, consult a qualied heating technician
and follow his recommendations as to the safest and most
efcient method of installation.
This furnace can be installed in three ways, as a stand alone
unit, parallel, and in series with an existing furnace.
SUPPLY AIR (HOT AIR) PLENUM
The warm-air supply duct 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 90B, 2-1.3.
When installing this furnace the hot air plenum is to have a
minimum height of 24” (610mm) if the top of the rst vertical
section is not ush with the top of the rst horizontal section
of ductwork. If the top of the plenum is ush with the top
of the rst horizontal section of ductwork then the minium
height is 15” (381mm).
RETURN AIR (FRESH AIR)
The return (fresh) air intake on the furnace is on the rear of
the unit. The ductwork must be mechanically attached to
the unit or blower kit box with sheet metal screws to ensure
a proper operation.
STAND ALONE INSTALLATION
If installing this furnace as a stand alone unit, ensure all
local codes and all instructions in this manual are followed,
including clearance to combustibles, oor protector
specications and safety warnings.
PARALLEL FURNACE INSTALLATION
To install the new furnace in parallel with an existing
furnace follow the instructions for series installation with a
few additional requirements listed below.
• The return air will duct directly to the return of the new
furnace, and not be pulling through any other furnace.
• The output of the existing furnace must be equal to or
greater than this wood furnace.
• If installing in a parallel conguration the ductwork may
need adjustments so as to maintain the static pressure
between 0.2” W.C. And 0.05” W.C.
• A back ow damper must be installed in the supply duct
work of the new furnace, to ensure that air does not
circulate back through the wood furnace.
• Some installation congurations may require dampers to
be installed in the supply duct work of both furnaces.