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.
In the center is the sage we sat on in the previous sweat. The logs were buried in the pit as I'll describe below. The fire pit starts as a hole 3 feet across, and about 2 feet deep. The dirt that is removed is used to built up the sides of the fire pit, as the flames can get pretty large.his shows the rough layout of our sweat area. On the right is the piles of fire wood. We find we need roughly 2 piles of logs about 3 long, in a pile about 4 feet long, and 3 feet high. In front of the wood pile is the fire buckets.