Thermolec Application &Technical Notes - Manual (Page 20)

THREE EASY STEPS
STEP 2 - (continued)
Universal mounting of Thermolec heaters
Unique feature
By design, all Thermolec heaters are made non-sensitive
to air flow direction. The built-in high limit thermal cut-outs
are located in such a way that the air flow could be
in any direction without impairing safety
and the same heater
could be installed in
a horizontal or
vertical
duct.
Multiple Heaters in a duct
Normally, electric heaters are not designed to be used in series in a
heating installation. For very large heaters, manufacturing, shipping,
field handling and installation, can be simplified by using two or more
units specially designed for parallel installation. Each section has its own
cut-outs and terminal blocks are provided to interconnect the controls in
the field.
Clearance
Thermolec heaters are CSA and NRTL/C approved for zero clearance to combustible material. This
means that there is no distance restrictions between the section of the duct housing the heater and
combustible material. However, space should be provided to install and service the duct heater.
Please see the minimum recommended installation clearances figures below.
Two stacked sections in a duct
Installation clearances
Minimum recommended distance for safety and service