NEPTUNE SPACE IRON MASK Owner’s Manual rel. 1.0
October 2010
8
AIR CIRCULATION
The Neptune Space masks air circulation system is designed to minimize fogging and
reduce the amount of CO and CO2 build-up. The silicone oral-nasal pocket is built with
two one-way valves through which air is inhaled.
Exhaled air is directed through a valve under the oral-nasal pocket, limiting the mixing
of this air (containing high amounts of CO2) with the fresh air from the regulator. The
direction of exhaled air is controlled by a four position exhaust valve. The adjustable
valve allows exhaust to flow in four directions:
A—to the left
B—to the right
C—both (direction of least resistance)
D—no exhaust
Position D, the “off” position is used when the diver is in a “head-down” position which,
due to pressure on the second stage, causes the regulator to free flow. Placing the
exhaust valve in the off position causes pressure to build in the mask, preventing free
flow and returning the system to an “air on demand” situation.
EQUALIZATION
The Neptune Space IRON MASK is equipped with a simple patented internal device to
close the nostrils and allow underwater equalization. By loosening the screw it is
possible to move the plate up and down to find the most comfortable position to
equalize. The silicone caps may easily be turned. By turning the caps you may adjust
them to fit a larger or thinner nose (distance between the nostrils). Two additional
plastic inserts are supplied. By removing the silicone cap it is possible to install the
insert in the plate (cap post) increasing the distance of the cap from the plate and
allowing it to fit closer to the nostril. This is sometimes necessary for flatter noses or
when a hood is used under the mask.
To close the nostrils for equalization, simply press the top part of the mask (or push on
the regulator front cover especially if using the visor light). The two equalization
silicone caps will move upward and close the nostrils.
The silicone caps when correctly positioned should allow breathing through the nose and
close the nostrils only when pressing the top part of the mask to equalize