In the duct system, ventilation pipes are a basic element. In their manufacture, thermal insulation is used, and the profile can be very different. As an optimal solution, plastic ventilation pipes for hoods that have a rectangular or round cross section are used.
Settlement
In order to ensure the normal operation of ventilation, initially it is necessary to determine the purpose of each part of the system. Fittings, sectional variations, pipes, as well as material for the duct or hood must be selected individually. Acquisition and installation work is always carried out after the preparation of the project. The wizard should consider the features of the installation, location and operation of the system. This should include temperature conditions, room area, element performance, humidity and acoustic discomfort. Only in this way will it be possible to ensure the normal functioning of man. When making calculations, it is necessary to take into account that rectangular and round pipes of insignificant diameter are capable of emitting more impressive noises than wide-profile ones.
Sectional area determination
If you will use plastic ventilation pipes for drawing, then as the most suitable sectional area of ββthe duct you need to take a value that is calculated by the formula a = 25s. In this case, the flow rate should be equivalent to 3 meters per second. The letter βaβ refers to the cross-sectional area expressed in square centimeters, while s is the air velocity. These two values ββare related to the constant (25). This indicates that the most suitable cross-sectional area is 75 square centimeters. If you use the school geometry course and the formula (a = Ο x rΒ²), then you can easily calculate the required dimensions. When choosing plastic ventilation pipes for hoods, one should prefer those that have a diameter of 2.8 cm. A certain length is also chosen for this indicator. When using rectangular pipes, the calculation is performed by a similar method. If you have to install ventilation pipes on the roof, and there is no possibility or desire to do the calculations yourself, then these manipulations are recommended to be entrusted to specialists.
Features of the installation
It is worth considering that polymers do not have fire resistance properties. In this case, it is necessary to use the technology of combined mounting and additionally install pressure fans, which contribute to the forced acceleration of air movement. Specialists who are involved in the installation of ventilation systems, as a rule, use the method of combining galvanized metal and plastic. In this case, you can combine rectangular, round and other sections. Such solutions are used in the installation of long systems that go from technical rooms and pass through places where crowds are recorded in large numbers.
These include restaurants, fitness centers and clubs. If ventilation pipes will be installed on the roof, then you should use the experience of consumers. Thus, the most popular sections are those that belong to the range, which is equal to the limit of 55 to 110 millimeters. While the most frequently purchased pipes are those that have a length of 0.5 to 1.5 m.
Installation Specialist Recommendations
If in the process of laying the duct system the plastic ventilation pipes will be used for the hood, then it is worth considering that the greatest efficiency can be achieved with the most straight line for the location of the elements. In the presence of turns, the cost of accessories will be increased, and the total amount of repair will be very impressive. When choosing the shape of the pipes, it is necessary to take into account that a rectangular section is able to withstand to a greater extent the air flow compared to a round one. Yes, and the technological process of fixing the docking involves more trouble.
Factors in favor of rejection of plastic pipes before installation
If you want to use plastic pipes, the price of which is not so impressive compared to analog solutions, then before starting repairs, you need to familiarize yourself with all the disadvantages of the material described. Among the shortcomings can be identified low fire resistance, which is the main disadvantage. This feature significantly limits the scope of use. As a result, the ventilation system may not be accepted by the fire services under the inspection act. That is why plastic pipes are rarely used in production facilities. The use of this material is inappropriate for transporting steam or excessively hot air. It is impossible not to mention a rather laborious installation, as the technology requires the master to have the necessary skills and knowledge. Among other things, plastic pipes must be mounted in tandem with special fittings and fittings. However, the most advantageous is considered to be the plastic pipe. Pipes for hoods, the sizes of which you can calculate according to the above formula, correspond to the budget decision and allow you to reduce the cost of construction without harming the aesthetics of the building, both inside and outside.
Nuances of installation
Plastic pipes for hoods in the kitchen are used quite often. They can be painted in any color, as well as make an independent installation. As for the general duct system, the output provides for the installation of a steel pipe, the diameter of which should be 160 millimeters. This part must be supplemented with pipe bends. Before connecting plastic pipes, it is necessary to take into account some recommendations for the work. In accordance with the rules of fire and sanitary standards, the system can be equipped with a blower and a suction fan, which is able to forcibly stretch air masses. The use of a pipe whose diameter is 225 millimeters or more is advisable in the case when non-standard solutions occur. Here you can highlight the need to reckon with the technological or architectural features of the building, facility or specific premises. When solving such problems, engineering flaws and miscalculations may well come to light, however, specialists are able to quickly solve such problems fairly quickly and for a moderate fee.
The choice of design features of the pipe before installing the system
If you will use a profile plastic pipe , then you need to choose the correct diameter, which should not be less than the exhaust outlet at the outlet. Otherwise, the performance of the device will be reduced, the noise level will be higher, and the load on the engine will also increase. In this case, the hood may fail. If the ventilation duct of the building has a diameter that is smaller compared to a similar characteristic inherent in the exhaust openings, then the whole point of installing an air duct of a more impressive diameter will be lost. When installing the exhaust pipe, it should be remembered that it should not be too curved and long. With a right angle, performance is reduced by 10%.
Conclusion
With a more impressive bend, improper air outflow, as well as motor overload, can be triggered. Plastic pipes, the price of which can start from 40 rubles per linear meter, are not the optimal solution for the duct system in all cases.