Easy to install snap fit design for use in enclosures that require cooling but have limited space in NEMA 1 and 12 applications. Housing and grille are made of black heat resistant (ABS-FR), self-extinguishing material. Fans are available in 115 or 230 volt AC, 60/50 Hertz (HZ) single phase or 24 volt DC. Filter Class G3 EN 779 - Filter Fire Class F1 DIN 53438 Self-extinguishing.