The vacuum tube in a CRT can implode if it is broken or punctured. The surrounding air will rush violently into the unsealed vacuum in the CRT, spraying broken glass in every direction. Color CRTs may contain mercury or other potentially toxic materials.
Instructions. Build a hearth for a fireplace that is 16 inches deep, according to This Old House writer Harry Sawyers. This is the standard requirement for municipalities and homeowner associations. The hearth should also extend a minimum of eight inches on either side of the fireplace.
Under the hearth. The spot underneath a raised hearth often goes unused. Make the most of it by creating a spot for wood storage underneath. Design tip: When designing for storage under the hearth, keep in mind that a raised hearth is made to sit on. Inspiration for a timeless family room remodel in New York with orange walls and a stone fireplace