As a Steelworker you are required to operate sheet-metal tools and to apply basic sheet-metal layout techniques. In many Naval Construction Force (NCF) projects, sheet metal is used to protect the exterior of buildings by using flashing, gutters, and at times, complete sheet-metal roofing systems.
Other essential oils have anti-microbial actions, protect against colds and are highly effective for respiratory support, whose essences can be inhaled to address ear, nose, throat and lung problems. These include: 1  Frankincense (Boswella carteri). 2  Lavender (Lavandula augustifolia). 3  Lemon (Citrus limonom).
Tea tree oil is said to be helpful in alleviating chest and head congestion, stuffy nose, and other symptoms of colds and flu. In aromatherapy, tea tree oil is said to be helpful in alleviating chest and head congestion, stuffy nose, and other symptoms of colds and flu, especially when used in steam inhalation.