Provisions on the configuration of smoke masks in hotel rooms

The rules for hotel rooms equipped with smoke masks are as follows:

1, mask appearance standard requirements: the mask appearance should be smooth, free of bubbles, burrs and defects that affect air tightness.

2. Standard requirements for the observation window of the mask: there are facilities to keep it clear when you see the real thing. The transmittance of the lens should be > 85%. When tested under certain conditions, the lens will not break.

3. Visual field standard requirements for masks: large eyes and large windows: total visual field > 65%, binocular visual field > 55% and lower visual field > 35%. Binocular window requirements: total visual field > 65%, binocular visual field > 55%, lower visual field > 35%.

4. Standard requirements for actual dead space of face mask: requirements for large-eye window: < < 250ml, actual dead space when installing nose and mouth mask < < 180ml. Requirements for binocular window: < < 280ml, and the actual dead space when the muzzle cover is installed inside < < 180ml.

5. Airtightness standard for mask assembly requires that the pressure drop within 1min should not be greater than 50Pa.