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 am building a mantel for my fireplace. The fireplace is elevated about 8 to 10 off the floor on a brick hearth. The width, including off set and pilaster width will be about 78,and the fire box is about 38 high.What would be an appropiate height for the mantel. I am 6' tall and my wife is 5' 6 tall. am building a mantel for my fireplace. The fireplace is elevated about 8 to 10 off the floor on a brick hearth. The width, including off set and pilaster width will be about 78,and the fire box is about 38 high.