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"Seventy-two precious arts are held in a brocade bag, they're kept just like a great treasure. Eighteen turn out the essence in the famous treatises on pugilistic arts. Eighteen other arts describe in more detail training methods if you use special tools and training equipment. Wonderful ways of adopting the flexibility in the breath-chi, exercises in obtaining hardness and lightness, clenching methods are written with all the blood of monks in magazines that are kept being a treasure in the brocade bag. One can seldom meet people who genuinely wish to do exercises with zeal: to become a real hero, you have to often feel bitter taste of hard labour. " /Secret Shaolin Treatises about the Pugilistic Art/ There are more uses of air cooled heat exchangers, like the upstream production, refineries and petro-chemical facilities. It can also be employed on situations rich in temperature, high pressure, corrosive fluids and environments. Moreover, air coolers could possibly be equipped and found in oil and coal refineries; compressor stations for gas pipelines; subsurface gas storage facilities; plants producing polychlorvinyl, polyethylene, glass fiber, biplastic; caustic soda plants; by-product coke plants and ammonia transportation and handling plants. Today's building codes state spaces using furnaces have to have method for getting back together combustion air since it used. Newer homes have ducting installed, during construction, that literally brings fresh air from the outside for an area close to the furnace. This ducting, usually called comprise air duct, or combustion make-up air, is sized according to the capacity from the furnace.