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The system's modularity is derived from the use of PALS webbing as rows of heavy-duty nylon stitched onto the vest to allow for the attachment of various MOLLE-compatible pouches and accessories.
Gravity dampers do not have motors and require air pressure/air flow to open. Louvers are used on air intake or exhaust where protection from water infiltration is required.They have fixed blades that do not close so if the application requires air shutoff, a combination damper/louver is recommended.ravity dampers do not have motors and require air pressure/air flow to open. Louvers are used on air intake or exhaust where protection from water infiltration is required.