Ocean Reef NEPTUNE SPACE PREDATOR Owner's Manual page 7

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with the official measuring procedure used in the Los Alamos Scientific
Laboratory Charts at the SBCCOM Mask Fit Facility-Aberdeen Proving
Ground (Maryland, USA). Before purchasing a mask, the customer may use
the caliper to take two simple face measurements. Using the Full Face
Mask Size Recommendation Chart, he or she can evaluate the size
category into which the measurements fall. There are three different size
categories on the chart: Small/Medium, Both, & Medium/Large. If the
measurements fall within the Both category, then the diver should
technically be able to wear either full face mask (M/L or S/M), and in that
case should try on a mask to select the best fit. Please note that the
chart boundaries fade. The fading areas represent less common face
measurements. It is very likely that a mask will still fit comfortably even
if measurements are located in these fading areas.
ADAPTABILITY
The newly redesigned bellows-type skirt with a "spring profile" and large
sealing surface (30-45 mm, double that of a conventional mask) is molded
of premium grade silicone rubber. The spring effect is achieved by a
combination of the double "S" section and the inner support ribs,
resulting in a comfortable fit and ample support. This allows the mask to
"float" comfortably on the face. The face seal and strap concepts are
Ocean REEF patents
VISUAL FIELD
The visor, made of transparent polycarbonate, is designed to be wider
and sit closer the face than previous full face masks. This design
maximizes the visual field, particularly the peripheral area. The visible
light transfer of the visor is 92%.
DURABILITY AND SCRATCHING RESISTANCE
The visor of the Neptune Space Predator can resist the impact of a 6.35
mm steel ball traveling at speeds of 540 km/hour (335 mi/hour). The visor
is coated on both sides with a siloxane resin to increase the scratching
resistance. For added protection during transport, the Neptune Space
Predator comes with a removable protective shield (to be removed before
diving).
THE HEAD HARNESS AND FRB II
The head harness straps are directly attached to the face shield, allowing
pressure to be distributed equally along the mask skirt. The six textile
straps of the Polar Mesh head harness hold the mask in a firm position due
to their low elasticity.
AIR CIRCULATION
The PREDATOR 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 newly redesigned one-way valves through which air is
inhaled. Exhaled air is directed through a newly redesigned valve under