Centrifugal exhaust veshilyatory
Centrifugal exhaust veshilyatory serving system with torch release (and that hedgehog with wet air cleaning), ooyazatelno should be fitted with a device for removing water from the casing. Usually, this siphon tube with a diameter of 20-50 mm with a depth of water seal of 200 mm. Is removed through a siphon water is desirable to take down the drain through the face. In a large exhaust chamber device ladder in the floor required.
When installing the fan outside the siphon device is impossible. In this case, the diversion of water from the jacket can be made conventional nozzle. However, it must be remembered about the possible dislodging of toxic hazards.
With proper operation of fans rarely fail, so they typically are not duplicated. Only in special cases where unacceptable, downtime ventilation fans overlap is dictated by necessity.
Duplication fan inlet systems are generally not applied. Exceptions are the central inlet chamber, serving several buildings. In this case, requires a reserve supply fan.
In many cases, it is useful to include in the design of the so-called "cold reserve", ie have in stock replacement units (fan and motor) that can be quickly installed to replace retired from the system.
Installing standby blower is used almost universally for venting buildings without windows and skylights.
The question of where the industry should have the fans, decided in each case differently, depending on the nature of production, the location of industrial sites and placement of buildings on it, as well as the aesthetic requirements. Nevertheless, there are some basic general provisions.
Have inlet uninsulated, and, especially, outside the building - is irrational, and in some cases impossible. Unacceptable, for example, have forced the installation of the shop, which has toxic discharge. Sucking the polluted air in the supply system through leaks its suction side is simply dangerous. Supply plant, local and central - are usually located in isolated areas - air handling chambers. These cameras are in the shops with toxic secretions should have separate entrance from the outside or, in extreme cases - vestibule.
From all perspectives - aesthetic, operational and sleigh Tarn - exhaust fans should be installed in isolated veshilyatsionnyh cells. Even the network valve Jurassic \ staiavlivayuts.n outside the building, they are grouped zhe.tsme.tyyu "and somehow isolated from the environment by zero placement in a box under the eaves in the PLI cover. Install exhaust fans directly in the production areas is allowed only as an exception, because any fan noise is continuous, thereby worsening the working conditions in the shop.
Note that the instructions for the design of heating and ventilation prohibits the placement in the common rooms (chambers) air handling systems with exhaust, if the latter removes toxic hazard - gases, fumes, dust, etc. The above remains true even when the dampers on the intake side exhaust systems.
When you delete an extract of toxic substances is necessary to ventilate the exhaust chamber. It is also desirable to create back pressure in the indoor air supply chamber, releasing part of the air in these rooms.