Stand Alone Installation - United States Stove Company Hot Blast HB1520 Owner’s Instruction And Operation Manual

INSTALLATION
DUCT WORK
We strongly recommend that the hot air ductwork
be installed by a home heating specialist. If doing
the installation yourself, consult a qualified heating
technician and follow his recommendations as to the
safest and most efficient method of installation.
SUPPLY AIR
The supply air 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
supply air plenum is to have a minimum height of 24"
(610mm) if the top of the first vertical section is not flush
with the top of the first horizontal section of ductwork.
If the top of the plenum is flush with the top of the first
horizontal section of ductwork then the minium height is
15" (381mm).
RETURN AIR
The return air intake on the furnace is on the rear of the
unit. The ductwork must be mechanically attached to the
unit or blower box with sheet metal screws to ensure a
proper operation.

STAND ALONE INSTALLATION

When installing this stand alone furnace, ensure all local
codes and all instructions in this manual are followed,
including clearance to combustibles, floor protector
specifications and safety warnings.
Supply Air Duct Work Outlet Size
LISTED FACTORY BUILT CHIMNEY
28.5
20.5
Your wood furnace may be hooked up with a factory
built or masonry chimney, matching the diameter of the
exhaust. If you are using a factory built chimney, it must
comply with UL 103 or CSA-B365 standard; therefore it
must be a Type HT (2100°F). It is extremely important
that it be installed according to the manufacturer's
specifications.
If you are using a masonry chimney, it is important
that it be built in compliance with the specifications of
the National Building Code. It must be lined with fire
clay bricks, metal or clay tiles sealed together with fire
cement. (Round flues are the most efficient).
The interior diameter of the chimney flue must be
identical to the furnace smoke exhaust. A flue which is
too small may cause draft problems, while a large flue
favors rapid cooling of the gas, and hence the build-up
of creosote and the risk of chimney fires. Note that it is
the chimney and not the furnace which creates the draft
effect; your furnace's performance is directly dependent
on an adequate draft from your chimney.
Do not connect this unit to a chimney flue serving another
appliance.
The following recommendations may be useful for the
installation of your chimney:
• It must rise above the roof at least 3' (0.9m) from the
uppermost point of contact.
• The exterior portion should be double or triple wall pipe
to ensure proper draft.
• The chimney must exceed any part of the building or
other obstruction within a 10' (3.04m) distance by a
height of 2' (0.6m).
• Installation of an interior chimney is always preferable
to an exterior chimney. The interior chimney will be
hotter than an exterior chimney that is being cooled
by the ambient air outside the house. Therefore the
gas which circulates will cool slower, thus reducing the
build-up of creosote and the risk of chimney fires.
• The draft caused by the tendency for hot air to rise will
be increased with an interior chimney.
• Using a fire screen at the extremity of the chimney
requires regular inspection in order to ensure that it is
not obstructed thus blocking the draft, and it should be
cleaned when used regularly.
IMPORTANCE OF PROPER DRAFT
Draft is the force which moves air from the appliance
up through the chimney. The amount of draft in your
chimney depends on the length of the chimney, local
geography, nearby obstructions and other factors. Too
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