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From: "A.Appleyard" <A.APPLEYARD@fs*.mt*.um*.ac*.uk*>
To: techdiver@terra.net
Date: Wed, 6 Sep 1995 13:40:53 BST
Subject: fullface mask fogging

  Someone wrote:-
> The ACSC/DCSC has a AGA/Interspiro FFM without valves in the oral-nasal cup.
> How prone this mask is to fogging is unknown to me.

  I got hold of an ex-Russian gas mask where the airflow is so arranged that
when the user breathes in, a sharp directed current of the air coming into the
mask blows straight onto the eye-windows; it has no inner mouth-and-nose
compartment. That cuts fogging down much compared with English-made gas masks.
  Another feature is that instead of straps it is attached to a complete head
hood of thin rubber. This seems more comfortable to me.

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