With this because they authorized the Sikh Army to cross the Sutlej in a very headlong confrontation using the English. Ranjit had signed a treaty with all the British that forbade him to cross the Sutlej River, but this became broken. The English were however preparing for that conflict and they had spies inside Lahore Durbar, with even the Prime Minister, the grandfather of the present Kashmir ruler( Now deposed) Karan Singh being in league with them and plotting the defeat in the Sikh Army. This service what food was in return for him to be made the Maharajah of Jammu and Kashmir. 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.