Doc No. 700070 Page 27 of 56
fig 5.d. End Vent Ducted Air Inlet Connection
fig 5.c. Header Duct Connection
fig 5.e. Burner Ducted Air Inlet Connection
Branch Duct
Ø100 for NRV 24M, Ø100 for NRV 32M-46M
Main Header Duct
Ø150 for NRV 24M,
Ø100 for NRV 32M-46M
Ø100 Duct to EVM
Ø100 Duct to Burner
500mm MIN
45
0m
m M
IN
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1.13.1 Ducted Air Inlet Considerations.
Heat resistant flexible tube is connected to the burner
assembly ducted air adaptor and the EVM ducted air
adaptor and connected to the air supply duct
The maximum length of 100mm diameter ductwork is
2m.
Ensure that the flexible supply duct does not drape
over or touch the reflector.
ensure that the flexible ductwork is installed to allow for
expansion of the heating system.
On a header duct, the main air supply header which is feed-
ing the individual branch ducts and burner/end vent supply
ducts must have a maximum pressure drop of 0.25 mbar
(0.1in wg).
All joints and seams in the air supply system must be made
air tight and a bird screen used at the inlet.
