Профессиональное развитие будущих инженеров-строителей средствами иностранного языка: Лексический практикум по английскому языку. Трубникова Н.В. - 86 стр.

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Balanced flue

The balanced-flue system used for boilers, warm air units, convectors and

water heaters is used for appliance ratings up to around 30 kW. External wind

pressure is applied equally to the combustion air inlet and the flue gas outlet

parts of the combined terminal. The only pressure difference causing air flow

through the appliance is that caused by combustion. The flue terminal should

not be underneath a window or within 0.5 m of a doorway or openable window.

It should not be located in a confined corner where external air flow might be

restricted. Fan-assisted balanced flues have been used and these allow more

flexibility in siting the appliance further away from the terminal. Balanced-flue

appliances are also called room-sealed appliances.

Se-ducts and U-ducts

Room-sealed appliances in multi-storey flats are connected to a vertical

precast concrete shaft extending from the fresh air inlet grille at ground level to

a terminal on the roof. Combustion air is taken from the duct by each heater and

its flue products are passed into the shaft. The duct is sized so that sufficient

ventilation is provided for the whole installation. With a U-duct a separate

combustion air inlet duct takes air from

The pipe will be either asbestos cement or double-walled stainless steel

with thermal insulation between the inner and outer pipes. A flue pipe taken

through a roof is fitted with a lead slate to weatherproof the junction. The ter-

minal should be 600 mm from the roof surface and clear of windows or roof-

lights. An internal flue from a small domestic appliance can be connected to a

ridge terminal. An externally run asbestos cement flue pipe has a branch tee

junction at its emergence through the wall. A 25 mm copper drain pipe takes

condensation to a drain gulley.