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Full Face Mask Experience Course

Full Face Mask Experience Course

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Full Face Mask Experience Course

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  1. Full Face Mask Experience Course

  2. We Will Cover • Course Structure • What is a Full Face Mask? • Why use a Full Face Mask? • Full Face Mask Features • Fitting and Releasing a FFM • Precautions • Summary

  3. Course Structure • Course consists of 3 segments • Theory / Lectures • Dry workshop • Pool session • Divers work in pairs • One mask per pair & rotation system • All participants to dive with all masks

  4. What is a Full Face Mask ? • A FFM encloses the entire face • Most FFM’s consist of two halves: • A mask • Provides an air space for the eye to focus • An oro-nasal pocket • Reduces dead space volume • Prevents build up of carbon dioxide • Allows a diver to breathe through nose

  5. Why use a Full Face Mask • Protection from cold or polluted water • Can be fitted with communications • Diver to diver • Diver to surface • Breathing supply secured through mask • Gas supplied in the event of blackout • Less jaw ache on long dives

  6. Full Face Mask Features Visor Microphone Regulator May be positive or negative pressure

  7. Full Face Mask Features Spider Skirt Nose Block Microphone

  8. Equalisation Method • Varies from FFM to FFM • Pinch nose as normal (Scubapro) • Use external mask levers (Drager) • Push mask against face and use nose block (Aga) • Some divers simply swallow or use jaw movement

  9. Fitting a Full Face Mask • Proper fit is vital to ensure • Comfort • To prevent leaks • Ensure gas supply is on before fitting • Option to fit inside or outside dive hood

  10. Fitting a Full Face Mask The cup of the spider should be positioned so it sits at the back of the head Correct Incorrect

  11. Fitting a Full Face Mask Normally accomplished by tightening the bottom straps first and work upwards

  12. Releasing a Full Face Mask Most masks have quick release levers on lower straps If comms are fitted protect from water

  13. Precautions Mask Malfunction • Practise clearing a flooded mask • Consider a half mask and AAS • Consider out of air for your buddy Carbon Dioxide build – up • Caused by poorly fitted/ vented mask • Could lead to Hypercapnia • Ensure correct diaphragm breathing

  14. Precautions Gas Consumption • May have increased gas usage with a poor fit – monitor gas regularly • LED gas warning light may be fitted to some masks for poor visibility Pre dive checks • Ensure Gas is on and good fit • Checks for leaks in shallow water • Do a comms check in shallow water

  15. Precautions • Each Full Face Mask has different features and characteristics and each FFM should only be used as per manufacturers instructions • Maintain as per manufacturers specifications

  16. Precautions • Buoyancy characteristics – may need an extra weight • Build up experience slowly , gradually increasing depth

  17. Summary • What is a Full Face Mask? • Why use a Full Face Mask? • Full Face Mask Features • Equalisation Method • Fitting and Releasing a FFM • Precautions

  18. Questions?