Installation, starting and adjustment of ventilation and air conditioning systems A Guide - страница 25

In addition, with external thermal insulation, the risk of fire spreading from room to room in the event of a fire is significantly reduced. The most important factor in the installation of thermal insulation is the prevention of thermal bridges that reduce the effectiveness of thermal insulation, as well as ensuring high vapor resistance. Heat transfer bridges can also occur in places where air ducts are attached to building structures.

The destruction of the thermal insulation material is prevented by:

• For internal thermal insulation – the use of composite materials, where thermal insulation is combined with a metal layer or film.

• For external thermal insulation – the use of neoprene sheathing, galvanized steel sheet or aluminum sheet.

1. What are the disadvantages of circular ducts?

2. What are the advantages of rectangular ducts?

3. What material is used in the manufacture of air ducts for buildings and structures for general civil purposes?

4. What factors influence the choice of material for the manufacture of metal ducts?

5. How does the use of flexible air ducts affect the extended sections of the routes of ventilation systems?

The grilles can be supply and exhaust. Those and others are adjustable and unregulated; round, square, rectangular; metal (more often steel or aluminum) or plastic; with and without decorative design; of various colors and sizes; with the direction of the flow of supply (or with the intake of the removed) air in one, two, three or four sides. Depending on the design of the grid, compact, flat, incomplete fan or other types of jets are created.

The control devices of the supply grids are the following types of regulators: flow regulator, jet characteristics regulator, direction regulator.

If the air distributor is equipped with more than one of the above regulators, then the regulating devices are usually installed in the same order along the air flow.

Exhaust grilles can also have flow and direction regulators. Some grid designs are universal and are used in both supply and exhaust systems.

Grilles are installed more often on the walls above the serviced area. At the same time, they can be specially designed for installation in the ceiling (for exhaust, inflow or universal).