Roof fans for smoke removal with flow upwards - photo, video

Some home security appliances are installed with the hope that they will never work. These devices include the roof fan smoke. In the conditions of a private house in which the volume of removed products of fuel combustion is small, the installation of such an instrument is a precautionary measure in case of fire. This article will tell you how to choose and install a reliable roof fan that will work at the right moment.

Varieties of roof fans

The roof fan used to remove gases from the smoke exhaust channels is a device whose design is based on a screw with large blades. It is installed on the chimney tube on the roof. Despite the proliferation of more advanced models of smoke exhausters, the effectiveness of roof models to protect a private home has been tested for years of trouble-free operation. According to the characteristic features of the design, the device for emergency smoke removal is classified into the following groups:

1. Axial. The easiest type of roof fans that serve to remove smoke. They are a screw with a system of blades, rotating around an axis, in a protective housing. The blades, set in motion by an electric motor, create a zone of reduced pressure and suck the air, mixed with the products of combustion, out.
2. Diagonal. Diagonal models of fans for smoke removal consist of a casing in which the impeller rotates with blades parallel to the axis of rotation. This design makes it possible to manufacture more compact and lightweight smoke removal devices. The main thing is that diagonal fans do not require maintenance, as they are supplied with a non-separable bearing. Despite its size and weight, these are very high-performance and low-noise devices.
3. Radial. The design of the radial fan includes a rotating wheel on which the blades of a special aerodynamic shape are located, they are bent forward or backward. Radial devices have more power, but create a lot of noise due to vibration. They are used for smoke removal in industrial premises; for living conditions, the radial fan is too noisy and bulky.

Note! All roof fans for smoke removal are divided into two groups: the first involves the removal of air flow from the products of combustion up, and the second - with a horizontal outlet. Models with a vertical exit stream are used to evacuate gases from the house, which include hazardous impurities. To protect the fan, which removes smoke up from moisture penetration, use a protective umbrella or a sealed cap.

Requirements for smoke removal devices

Fans mounted on the roof of the house, for smoke removal work in extreme conditions. They are mounted on a chimney through a special glass, so they withstand the high temperature of the air flow. For trouble-free operation, devices must meet the following requirements:

• High quality metal. Ventilation devices are made of high-quality alloy steel, protected from corrosion by electroplating molybdenum.
• Heat resistant. The best models of roof fans withstand the temperature of rising air with combustion products up to 900 degrees. Devices of an average price category make for work at a temperature up to 500-600 degrees.
• Resistance to active chemical compounds. During a fire, various aggressive substances that occur during combustion pass through the roof fans along with the smoke. The material from which the device for smoke removal was manufactured should not react with them.
• Power. The performance of the ventilation device is calculated in such a way that the entire volume of gases inside the house is removed in the shortest possible time.
• Noise level. This parameter is taken into account when choosing a domestic roof fan, since the noise arising from the vibration of the device should not cause inconvenience to the inhabitants of the house.

Important! Smoke removal systems are automatic and mechanical. Fans that operate automatically have a thermal sensor, which is triggered if the temperature of the gas coming out of the pipe rises to a critical level. To turn on the device without such a sensor, you need to press the button manually. Automatic ventilation systems for smoke removal recognize more efficient and safer.

Choice of roof fans

Choosing the right roof fan gives homeowners the assurance that in an emergency the protective mechanism will work and they will get extra time to leave the premises safely. When buying, pay attention to the following device characteristics:

1. Power. The performance of the device is always indicated in the accompanying documentation. You can visually determine this parameter, knowing a simple rule: the larger the screw, the more powerful the fan in front of you.
2. Easy installation. To install the fan for smoke removal on the roof of the house, choose simple models, which are installed without special equipment.
3. Reliability. Since life-saving depends on the operation of the smoke removal system, it is not worth saving and purchasing products from unknown manufacturers.
4. Fault tolerance. The ability of the device to idle the device in time to work without external manipulation. Fail-safe devices do not require maintenance, adjustment and repair.
5. Life time. Most masters involved in ventilation, pay attention to this characteristic of the device. Although the service life of the active smoke removal device lasts until the first operation. If he coped with his task, he should be immediately sent "to retire", replacing with another.

When purchasing a household roof exhauster for home maintenance, do not pursue power, approach this question rationally. A device with greater performance in vain consumes energy resources without speeding up the time to evacuate smoke from a room.

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