I.C.E. HTDM Food Process Unit - Manual (Page 7)

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be provided upstream of the piping to unit and should be
labelled for quick identification. Colour coding of gas piping
is also recommended.
In addition:
a) Carefully check the unit rating plate for fuel type and
supply pressure.
b) If required, locate the high-pressure regulator at least five
feet from the unit.
c) Gas lines must not be located in such a way as to hinder
access to the unit.
d) A minimum 1/8" NPT plugged tapping, accessible for test gauge
connection, must be installed immediately upstream of the gas
supply connection to the appliance.
GAS VENT
High gas pressure regulator (if required), low pressure
regulator, pilot pressure regulator, gas pressure switch (if
supplied), and normally open vent valve (if supplied) must be
vented outside of building for an indoor unit (check with
authorities having jurisdiction).
DUCT FURNACES
a) A duct furnace shall be installed with an inlet duct, which
will provide air distribution equivalent to a straight run of
duct having the same cross-section area as the inlet
connection and not less than two equivalent diameters in
length.
b) The ducts connected to the duct furnace must have removable
access panels on both upstream and downstream sides of the
duct. The opening must be accessible, and shall be of such
size, that smoke or reflected light may be observed inside
the casing to indicate the presence of leaks in the heating
element. The cover for the opening shall be attached in such
a manner as to prevent leaks.
c) The installation of the duct furnace must be adjusted to
obtain an air throughout within the range specified on the
appliance rating plate.
d) If a duct furnace is connected to a return air duct or any
other inlet air restoration; the duct furnace shall be
installed on the positive pressure side of the air-
circulating blower.