Ventilation systems

Ventilation system is combination of methods and equipment aimed to secure workplace atmospheres, which are as free as practicable from hazardous contaminants and abnormal meteorological condition. A ventilation system works to extract contaminated or heated air from work area and input the fresh one.

Ventilation is classified as following.

By air circulation it’s classified into natural and mechanical ventilation, combined (together action of natural and mechanical ventilation).

By direction of airflow – input, extract, input and extract ventilation.

By location - general ventilation, local ventilation and combined ventilation.

By time of operation – regular and emergency ventilation.

Natural ventilation

Natural ventilation is classified as organized and disorganized one. Disorganized ventilation provides input and extract of airflow depending on direction and force of the wind and temperature of inside and outside air. It consists from infiltration and airing.

Infiltration is input air leakage through voids in windows and doors. Opened doors and windows make airing.

Organized natural ventilation is called aeration. It’s arranged through ventilation opening in the walls to input the air, ventipane in the roof or top section of the building to extract the air. Deflectors mounted in ventilating shaft and vent tube improve effectiveness of ventilation.

Natural ventilation is cheap and easy to operate, however input air is not previously purified and may be contaminated.