herald (plural heralds) 1  A messenger, especially one bringing important news. 2  A harbinger, giving signs of things to come. ( 3 heraldry) An official whose speciality is heraldry, especially one between the ranks of pursuivant and king-of-arms. ( entomology) A moth of the species Scoliopteryx libatrix.
a fire nozzle weighs approximately  ten to fifteen pounds.
More air. The biggest benefit of the reduced weight and size is the ability to carry more air. The increased air pressure in the cylinder gives firefighters 50 percent more air in the same size cylinder they may be currently using. For example, a 30-minute 4.5 cylinder is equal in size to a 45-minute 5.5 cylinder. A firefighter using the 45-minute 5.5 cylinder is now carrying 50 percent more air.