I.C.E. HTDM Food Process Unit - Manual (Page 5)

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Ducts connected to the furnace shall have removable access panels
on both the upstream and downstream sides of the furnace. These
openings shall be accessible when the furnace is installed and
shall be sized to allow the observation of smoke or reflected
light inside the casing to indicate the presence of leaks in the
heat exchanger. The covers for the openings shall be attached in
such manner as to prevent leaks.
The furnace must not be operated in the presence of chlorinated
vapours. When such vapours mix with products of combustion, highly
corrosive compounds result, which will result in the premature
failure of the heat exchanger and other components. In such an
event the warranty is void.
CONNECTING THE FLUE (VENTING)
When making flue connection to the unit, observe the following
general recommendations. In addition, the HTDM series ofunits are
approved and must use recognized type "8" vent and/or vent
connector. All connections must conform to the requirements of
current United States and Canadian codes (gas fires units), and be
in accordance with local authorities, which include but are not
limited to:
a) The flue must be securely attached to the unit with tight
joints.
b) The pipe from the unit to the flue should rise at least If.."
per foot, (76.2 mm).
c) The flue must be sized to have a cross-sectional area not
less than that of the flue collar at the unit.
d) Other appliances must not be connected so as to vent through
the flue of this unit.
e) Do not support the weight of the stack on the flue connection
of the heating section.
f) Minimize connecting pip length and the number of bends by
locating the unit as close to the flue pipe as possible.
g) Maintain clearances between the flue pipe and combustible
material that are acceptable to the local authorities having
jurisdiction.
h) For indoor/outdoor application the flues condensate deposal
pipe, located on the unit, shall be piped to prevent
accumulation of condensate on or around the unit.
The HTDM series are approved for use with type “B” venting. The
venting must be of recognized type. For type “B” vent use with
the HTDM 1000 and HTDM 1500 models a draft hood must be
connected in series with the type “B” vent. The Drafthood must