Viessmann Flue gas system Installation Instructions Manual page 14

Routing through a duct (cont.)
Open flue operation with combustion air supplied via interconnected
rooms (only possible for system sizes 60 and 80)
The interconnection piece to the
duct is created from a balanced
flue system. The combustion air is
drawn from the room via an opening
immediately by the chimney entry
(room interconnection bezel).
An adequate combustion air supply
must be safeguarded inside the room
as specified by the TRGI '86/96, point
5.5, through an interconnection with
adjacent rooms:
Minimum volume of the
n
interconnected rooms 4 m
rated output
Apertures in connection doors min.
n
150 cm
2
per kW
3
13