The S-cap hood is designed as a breathing device for use with ambient air to provide a 15 minute escape capability under emergency conditions, using a gas and particle filter that has been tested to the European Standard (EN 403:2004) for Escape Hood Filtering Devices.
Storage Life and Inspection Intervals
Factory sealed in foil bag under proper storage conditions:
Maintenance-Free for 4 years.
After 4 years, Testing is required.
Maximum Shelf Life: 10 years (4+4+2 years).
Maximum Shelf Life if stored in vehicles: 8 years (4+2+2 years).