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.
Stellar Hearth Products Custom Fireplacs offer a variety of solutions for those unique hearth projects that a standard fireplace just can't meet the needs of. We are able to design custom fireplace sizes from 2' to 100' wide, between 18 - 72 tall, in single, two, three or four-sided units for indoor, outdoor or indoor/outdoor installations. Whether for residential or commercial installations, we can design with traditional or contemporary interiors.