Fire Doors and Doorsets are classified as per BIS: IS: 3614 follows:

This

classification for fire rated doors

Type of Fire Door Fire Door Classification (Rating & Insulation)
(i) Fire rated hinged doors (Metallic)

FD 30 UD/ FD 30 PI/ FD 30 ID
FD 60 UD/ FD 60 PI/ FD 60 ID
FD 90 UD/ FD 90 PI/ FD 90 ID
FD 120 UD/ FD 120 PI/ FD 120 ID
FD 180 UD/ FD 180 PI/ FD 180 ID

(ii) Fire rated hinged doors (Wooden
composite)

FD 30 UD/ FD 30 PI/ FD 30 ID
FD 60 UD/ FD 60 PI/ FD 60 ID
FD 90 UD/ FD 90 PI/ FD 90 ID
FD 120 UD/ FD 120 PI/ FD 120 ID

(iii) Fire rated sliding doors (Metallic)

FD 30 UD/ FD 30 PI/ FD 30 ID

FD 60 UD/ FD 60 PI/ FD 60 ID
FD 90 UD/ FD 90 PI/ FD 90 ID
FD 120 UD/ FD 120 PI/ FD 120 ID
FD 180 UD/ FD 180 PI/ FD 180 ID

(iv) Fire rated rolling shutter (Metallic)

FD 120 UD/ FD 120 PI/ FD 120 ID
FD 180 UD/ FD 180 PI/ FD 180 ID
FD 240 UD/ FD 240 PI/ FD 240 ID