Thermolec Application &Technical Notes - Manual (Page 17)

THREE EASY STEPS
STEP 2 - (continued)
Size Limitations
Although there are practically no limitations to the maximum size of Thermolec custom-built heaters, all
CSA listed heaters must comply to the following minimum dimensions:
Size Limitation Table
CSA listed custom heaters are available in virtually any KW rating. However, Thermolec listing is
restricted to a maximum KW density of 22.5 KW per square foot of heated area for open coil and 13 KW
per square foot for tubular. For a quick approximation of the maximum KW available in a particular duct
size, please use the following formulas:
Modular Construction for Air Handling Units
Thermolec heaters can be part of large
air handling units. In this case, a heater
becomes a module of a bigger unit and is
designed to match the other components:
filter frames, fans, cooling coils, VAV
boxes, etc. Flanged units can be bolted
directly to adjacent sections or slip-in
models are inserted into a bigger unit.
Since there can be several special
conditions in such big units, the heater
has to be designed to accommodate
them. Special features can be installed
upon request: section with no heat,
pressure plates to equalize air flow, buffer
sections to space the heater
away from other components, etc.
Modular Heating Sections
Slip-in Type Flanged Type Slip-in Type Flanged Type
Open Coil Open Coil Tubular Tubular
Minimum Duct Width
6” 5” 8” 7”
Dimension “W”
Minimum Duct Height
5” 4” 6” 6”
Dimension “H”
Open Coil Type
Maximum KW = 22.5 x width in inches x height in inches
SC or FC 144
Tubular Type
Maximum KW =
13 x width in inches x height in inches
ST or FT 144