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New UL 300 compliant wet chemical fire suppression systems are now required to be installed for the protection of the hood plenum area. Most modern fire suppression systems include a mechanical gas shut-off valve (mentioned below) and an electronic micro switch is supplied with the system.New UL 300 compliant wet chemical fire suppression systems are now required to be installed for the protection of the hood plenum area. Most modern fire suppression systems include a mechanical gas shut-off valve (mentioned below) and an electronic micro switch is supplied with the system. A Plenum is an enclosure that is designed to contain Exhaust or Supply Air of different pressure levels for removal or delivery.