Fans series with backward curved blades - ex. 12.
Versions:
Standard: PE moulded housing - PP / INOX / Fe+ebonite welded impeller - epoxy painted frame - stainless steel screws
ATEX 
: PE-el antistatic moulded housing - PP-el / INOX / Fe-ebonite welded impeller - epoxy painted frame - stainless steel screws
Upon request available variants for both versions as list. 
