Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions page 46

C43
EHS.D0500.5010.400
C53
Air inlet
46
Closed
Air supply
from outside
Closed
Air supply
from outside
Flue outlet
E93.1804.014
Type C43. A type C4 appliance incorporating a fan
upstream of the combustion chamber/heat ex-
changer.
* Separate air supply duct
* Separate flue gas discharge duct.
* Air supply inlet and flue gas outlet at different
air pressure zones. But not at opposite walls.
See: Typical examples - example F