Viessmann Vitodens 100 Installation And Service Instructions Manual page 18

Preparing the installation
Installation Requirements
Position
k Vertically from a terminal on same wall
l Horizontally from a terminal on same wall
m Adjacent to opening
Vertical flue systems
Position
o From adjacent wall
p From adjacent opening window
q From another terminal
r Minimum height
18
(cont.)
Minimum spacing
mm
Minimum spacing
mm
1500
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300