In one year in the United States, the recycling of steel saves enough energy to heat and light 18,000,000 homes! Every ton of recycled steel saves 2,500 pounds of iron ore, 1,000 of coal, and 40 pounds of limestone. PAPER To produce each week's Sunday newspapers, 500,000 trees must be cut down.hey can help you add some flavor to your reports, spice up your presentations, or be just for fun. METALS Recycling one aluminum can saves enough energy to run a TV for three hours -- or the equivalent of a half a gallon of gasoline.
A chimney is a structure that provides ventilation for hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere. Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack, or chimney effect.
Any chimney should terminate at least 600mm above the ridge height.  This is a minimum to comply with building regs. This is measured to  the top of the pot. If the terminal â¦ is coming out of the slope of  the roof and not the ridge, then at least 2.3m measured  horizontally from the roof surface.ormally (and many places have their own code for this) a chimney has to be at least 2 feet higher than any roof within 10 feet of the chimney. check your local building dept for code compliance.