FACE PROTECTION >> Otos | Koken | >> Otos | Koken Face Shields Face Shields Code Detail 31 H Acrylic face shield protects wearer from airborne liquid and/or particulates. #33 Acrylic face shield. To protect against heat in front of furnace. 613410 Acrylic face shield. Lens can be slide into the helmet when not in use. To protect against heat in front of furnace.