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Ventilation

Fans for any application

Ventilation

If the existing natural ventilation in shafts and duct systems is not sufficient due to local conditions such as the location of the shafts or their cover properties, additional, technical ventilation measures become necessary. Especially in warm temperatures, when the air in the manhole is cooler than that in the surrounding area, it is often not possible to provide sufficient ventilation. Even temporarily opening manhole covers is not always sufficient for optimal ventilation. In sewer shafts, for example, foul gases can displace the oxygen in the air and even lead to unconsciousness among sewer workers.

This can be remedied with targeted technical ventilation and powerful fans. The fresh air then reaches the workplace directly and prevents health impairments caused by bad air. Sufficient technical ventilation is achieved when, for example, an air flow of at least 600 m³/h per m² of duct cross-section is achieved in ducts.

Other areas of application for industrial fans:

  • Water damage restoration
  • Industry
  • Building construction, civil engineering
  • Tunnel construction
  • Shaft and duct ventilation
  • Sewage treatment plants
  • Waterworks
  • Tank and boiler cleaning
  • Shipyards and shipbuilding
  • Construction ventilation and deaeration
  • Building cleaning

Fan characteristics

Every fan loses air performance when hoses are connected. The air resistance caused by the flow reduces the air performance of the fan. Since the necessary pressure is different for all fans and the user needs to know the air volume when using hoses in order to calculate air change rates, the operating point useful air volume (NLV) can be of help. With this duty point, the air volume is specified taking into account approx. 38 m of connected hose - i.e. the actual air flow when working with long lengths of hose.

For calculating other lengths, the graphic of the fan characteristic curve on the product pages can be used. Here the user can assume about 50 Pa pressure loss per hose length or 90 ° bend and add up the number. Then the expected air volume is read off.

Fans for targeted drying and ventilation

Shortening the drying process with fans

The aim of drying is to quickly remove moisture from walls, ceilings and floors. Three factors are at work here: the faster the moisture escapes from materials into the ambient air,

    • the warmer and drier the room air is,
    • the faster air passes the materials,
    • the larger the volume of air that passes by.

The effect of fans on the drying process is easy to understand. The fast air movement breaks up the layer of high humidity on the material and increases the evaporation rate. Walls, ceilings and floors dry faster! 

The use of fans accelerates evaporation - this can shorten the drying process by up to 50 %!

Fans for potentially explosive atmospheresEx protected fans

HEYLO fans with ATEX approval may be operated in zone 1.

Zone 1 is an area in which a hazardous explosive atmosphere consisting of a mixture of air and flammable gases, vapours or mists is likely to occur in normal operation occasionally.

The equipment is approved for substance group IIB. A typical gas for group IIB is ethylene with an ignition energy of 60 - 180 mJ.

Ventilation of shafts and canal systems

If the available natural ventilation in shafts and canal systems is not sufficient due to local conditions, such as position of the shafts or their cover conditions, additional technical ventilation measures are required. Especially in warm temperatures, when the air in the shaft is cooler than in the environment, no sufficient ventilation is ensured any more. Temporary opening of the shaft cover will not always ensure ideal ventilation. In sewer shafts, for example sewer gases may lead to a displacement of oxygen in the air and thus can lead to unconsciousness in canal work.

Remedy may be provided here by targeted technical ventilation and powerful ventilators. Fresh air gets directly to the work place and prevents health affects caused by bad air.

Sufficient technical ventilation is achieved when an air flow of at least 600 cum/h per square metre of sewer cross-section is ensured.

Ventilation in wine cellar

The dangerous fermentation gas of carbon dioxide (CO²) is produced during the fermentation of grape juice and mash. CO² is colour and odourless as well as approx. 1.5 times more heavy than air. Given the corresponding concentration in fermentation rooms, containers or cellars, the vitally essential oxygen is replaced. The light test with the candle, standard in former times, gives no safe indication of whether there is a CO² concentration dangerous for humans because the candle continues to burn when there is mortal danger. In case of fermentation rooms above ground level, a good cross ventilation may be sufficient. In case of rooms below ground levels, the ventilation has to be dimensioned in such a way that the room air can be replaced completely four times an hour.

Source: Accident Prevention Regulations for Fermentation Rooms VSG 2.4, Paragraph 2, publisher: Agricultural Occupational Accident Social Insurance Fund

HEYLO transport ventilators are ideally suitable for the ventilation of wine cellars. By connecting hoses to the suction and the blow-out side, fresh air can be transported also to the remotest spots or stale air can be drawn off from there as well. The ventilator is available in different performance classes