Description
| FA 30 VB | Class B zones and SLC loops |
| FA 30 VA | Class A zones and SLC loops |
| FA 30 BH | Bells Horns Strobes & powered Extenders Also noise filter |
| FA 60 VB | Class B zones and SLC loops above 28VDC |
| FA 60 VA | Class A zones and SLC loops above 28V DC |
| FA 60 NC | Bells Horns Strobes powered Extenders above 28V DC (Noise Filter) |
| FA 90V or NC | Audio Circuit surge suppression as well as Noise Filter |