Hood SR 601 together with the battery-driven SR 500/SR 500 EX or SR 700 fan and approved filters are included in Sundström fan-assisted respiratory protective devices. The breathing hose of the hood is connected to the fan unit which is equipped with filters. The over-pressure generated in the hood prevents particles and other contaminants from entering the hood. The equipment can be used as an alternative to filter protection in all situations in which the latter is recommended. This applies particularly to situations in which the work is intensive, hot or of long duration.