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Insulated duct installations, Duct with external insulation, Duct with internal insulation – Greenheck Duct Heaters Series IDHB and IDHC (478052) User Manual

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Insulated Duct Installations

Duct with External Insulation

The external insulation is to be removed from
the area where the heater is mounted.

Note: Size of heater is based on the duct size
(no recess required).

Duct with Internal Insulation

S-type with internal insulation left in place or duct constructed from insulation board

Recess = Insulation Thickness

Note: Size of heater is based on the following:
Heater ‘H’ = Duct ‘H’ - (Insulation Thickness x 2)
Heater ’W’ = Duct ‘W’ - Insulation Thickness
(recess required)

Internal insulation cut away

The internal insulation is to be removed from the
area where the heater is mounted

Recess = Insulation Thickness

Note: Size of heater is based on the duct size
(recess required).

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