Viessmann Vitocaldens 222-F Installation Instructions Manual page 25

Routing through a shaft
Stainless steel extension in conjunction with on-site shaft cover
A
Ø D
A Chimney extension made from
soot fire resistant material
B Stainless steel extension
C Shaft cover (on-site)
(cont.)
The shaft cover as a common down-
B
draught plate (chimney cowl) must be
C
provided on site.
25