The casing of the Rosenberg roof fans (DVNF/S, DVN/S) consists of seawater-resistant aluminium and a base frame with integrated inlet cone.
model - DVNF/DVN
up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel
from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating
model - DVNFS/DVNS
Casing with integrated sound insulation (S) ; base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating
up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel
from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating