Maximum Equivalent Length; (Horizontally Or Vertically Vented) - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

Direct Venting (Two-pipe System)
Vent Requirements - Stainless Steel

Maximum equivalent length -

(horizontally or vertically vented)

Intake Ø
Boiler model
CU3A 26, 35 3 in.
(80 mm)
CU3A 45, 57 3 in.
(80 mm)
A 7% boiler input reduction @ 60 m for all sizes and all
configurations.
28
Exhaust Ø Equivalent
length
3 in. 198 ft.
(80 mm) (60 m)
4 in. 198 ft.
(110 mm) (60 m)
(continued)
CU3A Venting Systems Installation