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.
I'm trying to locate a fire resistant rug for the front of a hearth. I would like to find one that also has some insulated properties as the pergo floor gets fairly warm under the current hearth rug we are using. Approximate size would be 2-3 feet by 4-5 feet and square.