Recently, the Russian ventilation equipment market has seen a sharp increase in interest in systems smoke ventilation and to the main components of these systems - smoke removal fans. This is largely due to the approval of a new “ Technical regulations about the requirements fire safety", one of the sets of rules of which is entirely devoted to fire safety requirements to heating, ventilation and air conditioning systems: “Code of Rules 7.13130.2009 Heating, ventilation and air conditioning. Fire safety requirements"
The production of smoke removal fans is one of the main activities of the VKTekhnologiya company. This article addresses the following issues:
Types of smoke exhaust fans
The main differences between smoke extraction fans are the housing design and the type of impeller. The most common and in demand fans on the Russian market are roof radial fans And radial scroll fans .
Roof radial fans
Roof radial fans have a number of advantages over others.
Firstly, fans are placed on the roof, the area of which is usually not used. This makes it possible to abandon the need to equip special rooms for placing smoke exhaust fans, and, as a result, increase usable area premises.
Secondly, the fans are placed on a building-grade shaft, which in many cases makes it possible to avoid laying a vertical air duct. Another clear advantage is that air is released directly from the fan into the environment, and there is no need to use an air duct to remove combustion products from the fan.
The housing design of roof-mounted smoke exhaust fans is used in two types: fans with side discharge and upward discharge. When choosing a fan housing design, one of the requirements must be taken into account regulatory documentation: release into the atmosphere should be provided at a height of at least 2 m from the roof of flammable materials; it is allowed to release combustion products at a lower height while protecting the roof non-flammable materials at a distance of at least 2 m from the edge of the ejection hole. The advantage of a side-discharge fan is its relatively low cost.
The advantage of a fan with upward discharge is more high location marks for the release of combustion products relative to the roof level. To install a roof-mounted smoke exhaust fan, a mounting bracket is used. The upper flange of the mounting housing is connected to the outer flange of the fan. The lower part of the mounting sleeve has different connecting dimensions depending on the shaft design. One way or another, the lower part of the glass rests on the shaft. The weight of the fan is transferred through the mounting cup to the shaft. There is a standard the lineup mounting cups, which is presented in the VKT product catalog. Also, depending on the shaft design, our designers select glasses with individual connecting dimensions. In certain cases, the use of an insulated mounting sleeve is required. In this case, the body of the glass is covered with thermal insulation, and an insulated air damper is placed inside the glass.
Radial scroll fans
Sometimes the use of roof-mounted smoke extraction fans is not possible. In these cases it applies radial scroll fan. The advantage of this fan is that it can be placed almost anywhere in the building or near the building, taking into account the equipment placement standards. In addition, it is possible to connect an air duct to this fan both at the inlet and outlet. Considering that the fan is capable of developing pressure up to 2000 Pa, it is possible to remove combustion products from the fan over fairly long distances. Air ducts on both the suction and discharge sides must have a certain fire resistance. As a rule, the required fire resistance is achieved by coating the air ducts with a fire retardant compound.
Calculation and selection of smoke exhaust fan
When calculating and selecting smoke exhaust fans, it should be taken into account that all characteristics presented in the catalog correspond to normal atmospheric pressure and air temperature 20 o C. To recalculate the characteristics of the fan to the temperature of the removed smoke, it is necessary to multiply the pressure by a factor of 293/(273+T), where T is the value of the temperature of the removed smoke in o C.
The VKTekhnologiya company produces fans with backward-curved blades. When selecting a fan for one operating point, as a rule, several fans are suitable. As one of the options, you should choose the fan that has a lower rated motor power, if this characteristic is relevant. Otherwise, it is recommended to use a fan whose size is smaller in order to reduce its cost.
It must also be remembered that in different points According to the operating curve, the fan consumes different power, that is, the rated power of the motor depends on the characteristics of the network.
Operating principle and control of the smoke exhaust fan
The principle of operation and control of the smoke exhaust fan is quite simple. A control panel is used for the fan. The signal to turn on the fan comes to the control panel from the fire automatic control panel.
As a rule, a smoke exhaust fan is used only in smoke ventilation, but sometimes it can be used in general ventilation systems. In this case, a frequency converter is used, which, upon receiving a signal from the fire automatic control panel, increases the fan rotation speed. This scheme is quite advantageous, since it allows you to abandon the additional system of general ventilation, using only the smoke removal system.
KVDU- roof fan smoke removal
DU - smoke removal
PVK - PetroVentKomplekt
When a fire occurs and a fire begins, the people in the room are endangered not only by the fire itself, but also by the combustion products, which can lead to complete disorientation and loss of consciousness. For this reason, it is important to ensure that smoke is removed from the very first seconds using a special ventilation structure.
Purpose and device
The PetroVentKomplekt company produces smoke extraction fans, axial fans for air pressurization and roof-mounted supply fans, which are successfully used at construction, industrial and administrative sites throughout Russia and the Customs Union.
Mounting the roof radial fan DYM (VKR)
Roof-mounted smoke removal fans DYM-F (exhaust upward) and DYM-N (exhaust to the side) remove combustion products from a room engulfed in flames, thereby providing conditions for the work of the fire brigade and the survival of victims. Both models, DYM-F and DYM-N, are radial smoke removal fans capable of operating at temperatures up to 600 C for two hours. Additional equipment includes mounting brackets for fastening to the roof (models MSU, MSU-VKOP), as well as check valves and control panels.
Smoke extraction fans from PetroVentKomplekt
Specialists technical department Our company has developed an energy-efficient fan impeller, which allows, with the same performance, to use smoke removal systems of more compact sizes and lower-power electric motors.
In addition, all RC roof fans produced by PetroVentKomplekt have mounting dimensions that are fully compatible with equipment from other manufacturers. This allows us to use our equipment at any facility and to implement even the most complex projects. If necessary, our company’s professionals will help you select the optimal equipment and installation components, and will also provide assistance in commissioning works on the object.
If you want to buy smoke extraction fans at the manufacturer's price, get the full free consultation our technical specialist by calling: +7-812-309-48-11, or sending a request through the form feedback Online.
Right now you can download the price list for products, technical catalog, selection program and questionnaires:
Selection program
questionnaires
technical catalog
Price list
A fire occurs due to careless handling of fire. The source of the fire may be in difficult-to-reach places, so arriving firefighters cannot immediately neutralize it. The main danger to human life is caused by combustion products and increased temperature. In order to ensure safe evacuation, fire system specialists have developed roof-mounted smoke extraction fans.
Types and characteristics
A roof fan is one of the units of a smoke removal system, which is designed to remove a hot gas mixture from a building. It is he who takes the main heat shock and, thanks to its design, continues to work until the fire is completely eliminated. The temperature of the removed gas mixture can reach +900 °C.
Roof-mounted smoke extraction fans come in three types, depending on the method of removing the gas mixture to the outside: axial, diagonal and radial.
- one of the simplest in its design. It is a cylinder with blades in protective casing. By rotating, the propeller blades artificially reduce the pressure and thereby draw out the gas mixture. The appearance resembles a simple home fan.
A diagonal fan is an elongated drum, inside of which one or more impellers are placed. The blades suck in hot air along the axis and throw it out diagonally, hence its name. The advantage of such a unit is its high performance and low noise level.
A centrifugal or radial fan removes smoke from the room thanks to the special design of the blades. During operation, such a fan throws combustion products into the street due to the centrifugal force created by the curved blades. With high air exchange, such a fan is quite noisy, so it is usually installed in industrial buildings.
Roof smoke exhaust fans are available in automatic and manual versions. Automatic devices equipped with special sensors. They are triggered when the temperature rises. Manual models are equipped with a special button to turn on.
Criterias of choice
Before choosing a roof fan, there are a number of criteria to consider:
![](https://i1.wp.com/protivpozhara.com/content/uploads/2016/08/1392314453.jpg)
The roof fan structure is assembled in the factory. This helps avoid design inaccuracies that reduce aerodynamic performance. As a rule, the smoke exhaust fan model is selected at the design stage. But if the fan becomes unusable during operation, then you can select it yourself, according to the existing nomenclature.
In the designation of the fan VR-10-DU-2ch/600(400) °С-5.5/710, the letters indicate its type (“VR” - radial, “DU” - smoke removal). Numerical values in order determine its main parameters:
- “10” — wheel size;
- “2h” – fire resistance limit;
- “600(400) °C” is the temperature of the transported gas mixture;
- “5.5/710” - engine characteristics power and speed.
Some manufacturers add the direction of rotation of the wheel and the position of the housing in degrees to the standard nomenclature.
Device installation
Installation of a fan depends on the type and angle of the roof. First, make a hole and install it in it. check valve, if necessary, install a vibration-absorbing structure.
Then the tray is attached, and the fan structure itself is attached on top. It is important to avoid distortion during installation, since the fan will not work in this position. After fastening, it is necessary to treat all connections with a special fire-resistant sealant.
When choosing a roof-mounted smoke exhaust fan, you must remember that it helps people not to get poisoned or burned by combustion products during a fire, so its choice must be carefully considered. It should be powerful, compact, and low noise. The design must be light and fire resistant.
The company "TEHVENTPROM" offers roof-mounted smoke extraction fans (VRMK) radial type. Direct purpose - air exhaust in residential and industrial premises.
All prices on request
Usually, roof smoke exhaust fan installed on the roof of the building. They are used to remove high-temperature smoke that occurs during a fire, as well as to ventilate air with the environment. Horizontal and vertical views are presented, as well as four-way and two-way air outlets.
Purpose of VRMK roof smoke removal fans
The fans comply with the fire safety requirements established in GOST R 53 302-2009, SP 7.13130.2009 and are designed to move smoke-air mixtures formed during a fire with a temperature of 400°C for 120 minutes and 600°C for 120 minutes.
The transported medium must be non-explosive, do not contain explosive gas mixtures, sticky substances, fibrous or abrasive materials, and cannot be more aggressive towards carbon steels of ordinary quality than the aggressiveness of air. The content of dust and other solid impurities in it is no more than 10 mg/m³. For aggressive and explosive environments, fans are made of of stainless steel and dissimilar materials.
Roof-mounted smoke removal fans VRMK used in emergency systems exhaust ventilation industrial, public, administrative, residential and other buildings, except categories A and B according to SP 7.13130.2009. It is prohibited to use fans for purposes other than their intended purpose.
Operating conditions for roof-mounted smoke exhaust fans
It is prohibited to use fans for purposes other than their intended purpose.
The fans are designed for operation in temperate (U) climates of the 2nd category of placement according to GOST 15150-69 at temperatures environment from minus 45° to +40°C, relative humidity up to 100% at a temperature of 25°C. Fans can be used in moderate climate conditions of the 1st category of placement.
Root mean square value of vibration velocity external sources Vibrations at the fan installation sites should not exceed 2 mm/s.
Basic technical data and characteristics of roof-mounted smoke exhaust fans
3.1 The design of fans, their overall and connecting dimensions are shown in Figures 1, 2, 3 and Table 1.
3.2 Aerodynamic characteristics of fans are shown in Figures 4-27.
3.3 Specifications electric motors are given in table 2
3.4 Installation of the fan on the glasses (passage units) of the SMKU in Fig. 4
1 - base, 2 - impeller, 3 - fan diffuser, 4 - casing, 5 - wall, 6 - electric motor blower impeller, 7 - fender impeller, 8 - hub, 9 - screen, 10 - bracket, 11 - blower system diffuser electric motor.
Fig.1 Main parts and components of the fan
1 base, 2 - impeller, 3 - fan diffuser, 4 - casing, 5 - wall, 6 - impeller for blowing the electric motor, 7 - fender impeller, 8 - hub, 9 - screen, 10 - bracket, 11 - diffuser for the blowing system of the electric motor , 12 - flare unit, 13 - flow direction
Fig.2 Main parts and components of the fan
A - length, width of the fan;
H - fan height
D- diameter;
C is the distance between the centers of the connecting holes.
Rice. 3. Main parts and components of the fan
Rice. 4. Installation of the fan on the glasses (passage units) of the SMKU
Main overall and connection dimensions
fan VRMK-3.15DU - VRMK-14DU
Overall and connection dimensions mm. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Fan index |
ejection to the sides |
ejection up |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-3.15DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-3.55DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-4.5DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-5.6DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-6.3DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
VRMK-7.1DU |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
An axial fan is usually an impeller (K) located in a cylindrical housing, mounted on the motor shaft. Additionally, an input guide vane (IVA) and a straightening vane SA can be used. Our company produces axial industrial fans according to the K and K+SA schemes. In an axial fan, the moving medium passes along the axis of rotation of the impeller. The main part of an axial fan is the impeller, due to the rotation of which part of the drive energy is transferred to the air to create a certain pressure and speed of movement of the moved medium. The impeller consists of a bushing and blades arranged evenly around the circumference in a certain manner. The blades are made of volume or sheet and can be rotary or fixed. The straightening apparatus (SA) serves to convert the dynamic pressure associated with the speed of swirl of the flow behind the impeller into static pressure. Wherein static pressure and static efficiency increase without increasing power consumption. In some designs, the SA additionally performs the functions of a power unit, where an electric motor or bearing unit can be placed. Roof axial supply fans type VKOP and VKOP-K VKOP VKOP-K Installations of the UVOP type are used in supply smoke ventilation (SD) systems and are installed on the roofs of buildings and structures. VOF-DU VKOP-S The use of the VKOP-S fan in tandem with the VOF-DU fan creates a harmonious pair of industrial installations on the roof of a building, created in the same style and having a modern design. IN TO VKO-K VKO-K is manufactured in various designs: Fans VKO and VKO-K, thanks to a different field of parameters, complement the range of radial-type roof fans. To reduce vibration levels transmitted from fans to bases and connected air ducts, use various types vibration isolators and flexible inserts. Purpose Design The material of the hose and flanges is determined by the fluid being moved. For each fan version there is a corresponding insert version. terms of Use
Share
![]() |