Mostly used in “Clean” rooms in pharmaceutical plants or hospital operation theatres to return or extract air from a low level through a vertical riser. Removable core in the grille simplifies cleaning of the inside of the riser. Available with either fixed louvers or perforations on the face.

1. Aluminium construction
2. Removable core
3. Available with fixed louvers or perforations

1. Model AB-RG-00 fixed louvers straight 0°
2. Model AB-RG-15 fixed louvers angle down 15°
3. Model AB-RG-PF perforated face