The ventilation system is a complex combination of various devices and elements that provide fresh and exhausted air. It is transported through bends, channels, transitions and gratings, which will be discussed later.
Round plastic ventilation ducts
Round plastic ventilation ducts are widely used in natural and forced ventilation systems of residential or industrial premises.
There are several advantages to cylindrical plastic ducts:
- smooth walls reduce airflow resistance;
- plastic ducts do not need to be soundproofed;
- not destroyed by moisture and chemicals;
- inexpensive
- light weight and a large number of round passages for ventilation makes installation quick.
Plastic round ventilation ducts are installed in rooms requiring enhanced air exchange, since the circular cross section almost does not create resistance.
Round plastic ducts for ventilation are well suited for chemical and galvanic industries, as well as buildings with high humidity.
A pipe with a diameter of 10 cm per hour will allow 300 cubic meters of air to pass through. If the diameter of the duct is less than the calculated one, it will buzz harder.
Disadvantages of ventilation from plastic round ducts:
- more difficult to mount than rectangular;
- low fire resistance;
- if the plastic round ventilation is not treated with an antistatic, it will attract dust and debris.
They are used in aggressive environments where metal pipes will quickly become worthless. Plastic round ventilation is used in the range from -40 to +95 degrees.
Plastic ducts for round ventilation have been used for 20 years without loss of properties.
Plastic does not emit harmful substances into the air, and round ventilation pipes allow you to create a sealed structure without suction and pressure loss. It is possible to adjust the plastic round duct channels for ventilation directly on the spot, which greatly facilitates their installation.
Flexible round ducts
Corrugated round ventilation pipes are a frame made of wire coated with PVC, aluminum foil. Flexible plastic pipes of circular cross-section for ventilation do not belong to corrugated pipes.
Flexible round plastic ventilation can be:
- with thermal insulation of increased strength or standard;
- without insulation (standard or increased strength);
- soundproofed (equipped with an internal duct).
Advantages of flexible ducts:
- ease of installation, dismantling;
- ease of maintenance and repair of the ventilation system;
- ease of transportation and storage;
- light weight;
- ease of replacing the track if necessary;
- low price.
The round plastic ventilation duct can be bent several times without tearing or cracking. It can withstand up to 60 degrees Celsius. The corrugated pipe can be operated up to +95 degrees.
Flexible air ducts are not installed on long routes, since sagging of the pipe is allowed no more than 5 cm.
Round ventilation grills
A round plastic ventilation grill is an indispensable component of any system that performs a number of functions:
- provides inflow and removal of air from the room;
- prevents the entry into the room of dust, dirt and insects from ventilation ducts;
- gives the ventilation output a neat appearance.
In some cases, air circulation depends on the condition of the round ventilation grill. Ventilation grills of any shape, round or square, are easy to install. And their operation does not cause difficulties: leaving consists in periodic cleaning from dust and dirt.
The direction of the air stream depends on the design of the round ventilation grill: in one direction, two, three, or four at once. Passing through the grate, a fan-shaped air stream is formed, flat, compact or otherwise.
By the installation method, all round plastic ventilation grills are:
- internal;
- external;
- overflow.
All square or round ventilation grills are divided by the nature of use into:
- exhaust;
- inflow;
- round air intake ventilation grilles.
Outdoor Round Ventilation Grills installed outside the building. They are necessary to protect the ventilation ducts from leaves, mice and rats, birds. Most often they are made from special aluminum alloys that are not oxidized and resistant to ultraviolet. All round outdoor ventilation grilles are covered with blinds at an optimal angle, which are heated in winter to prevent icing.
Internal round ventilation grilles 100 mm and other diameters are designed for indoor installation, hidden from the effects of destructive factors. Therefore, most often they are made of plastic. Round ventilation grills 250, 100, 80 mm are equipped with manually controlled blinds, they can be removed the middle part for cleaning.
Overflow or door round ventilation grilles are installed not only on doors, but also on walls. They serve for the unimpeded movement of air flow from one room to another. On the round door ventilation grilles, blinds of a special shape are installed, providing sound insulation.
Round ventilation grilles are adjustable, unregulated, inertial.
Although round ventilation grills look better, more often rectangular or square ones are installed. Adjustable round ventilation grilles are equipped with movable shutters that change the direction of air flow and cross-section.
Non-adjustable round ventilation grilles are made without such blinds, that is, it is impossible to change the air flow manually.
In inertial gratings, the blinds open and close automatically depending on the movement of air.
Lattices are made of plastic, wood, steel, aluminum.
Metal, as a rule, are installed outside buildings, as they are more durable. Plastic round ventilation grille 100 mm can be supplemented with decorative elements. The advantage of plastic round ventilation grills in their low weight, which can be installed on any surface. The choice of plastic grilles for ventilation of round, square or rectangular shape is very large. Their price is much less than metal or wooden. You can choose not only the form and function, but also the color that fits into the interior of the office, bathroom, kitchen.
Many manufacturers custom-make round grilles for ventilation of any size and color.
Wooden door lattices for ventilation, as a rule, produce not round, but rectangular. Other types of ventilation grilles for indoor use are also made from wood. They are decorated with carvings, they are environmentally friendly and look very dignified. Such round door ventilation grilles are quite expensive and require special care.
Round ventilation umbrella
Rectangular and round ventilation hoods protect the ventilation shafts from precipitation. The type of umbrella is selected depending on the shape of the section of the channel: for round ventilation ducts, round umbrellas, for rectangular - respectively. The second most important criterion: the correspondence of the diameter of the ventilation pipe and the diameter of the round umbrella. Round ventilation umbrellas are suitable for systems with natural draft and forced.
In the manufacture of umbrellas, the following types of connections are used:
- bandage;
- nipple;
- flanged.
Round ventilation umbrellas are made of rolled or sheet galvanized or stainless steel.
In addition to the functional load, the ventilation umbrella also carries aesthetic: the output of the round ventilation channel looks complete only after the installation of the umbrella.
Round ventilation taps
Branches are necessary for turning round air ducts for ventilation at angles of 30, 90, 60, 15 and 45 degrees. Round ventilation ducts are made of galvanized steel or stainless steel 0.55 - 1 mm thick.
The standard bend is designed according to the diameter = radius of rotation scheme.
But on request, round ventilation bends are made with any turning radius of 150 mm and any neck length.
Branches are assembled from separate segments, fastened to each other by a lock connection. Their size and quantity are determined by the angle of rotation. Bends with the smallest diameters are made by stamping.
As a rule, the diameter of the round ventilation duct is slightly smaller than the diameter of the round duct for ventilation. The outlet is simply inserted into the duct, which saves on fasteners and fittings.
Branches are connected by nipples or flanges.
Shaped products of small diameters can be purchased immediately, large and non-standard ones should be ordered. When ordering, the tap angle, diameter and radius of rotation (if it is not standard) are indicated.
Round transitions for ventilation
You can’t do without transitions where it is necessary to connect air ducts of different diameters and section shapes. For example, during repair of a ventilation system with a rectangular cross-section of air ducts, it is necessary to install a duct section with a circular cross-section. This happens when a single ventilation system serves premises for various purposes. The types of ducts for them can also be selected different. And to connect them into one system, round ventilation passages and bends are used.
The transitions are carried out according to certain rules, otherwise the air will not be evenly distributed over the channels, especially for transitions from round to rectangular section.
Round transitions for ventilation can be:
- central
- one-sided;
- asymmetric.
Transitions are made of a strip of galvanized or stainless steel with a thickness of 0.55 - 0.7 - 1 mm with a flange or nipple connection.
Video on how round ventilation passages are made:
