Mechanical parts of the ventilation systems
The mechanical systems consists of the series of tubes, air cleaner, blower etc. The mechanical arrangement for a dilution type ventilation is different that of the local exhaust system.
- The system must have tubes as it will cause the air to move from one place to another place.
- They can be made of different materials and different sizes depending upon the requirement of the industry.
- The tubes may also get corroded as they may be exposed to the toxic gases present in the working area when they are made of any kind of a metal.
- These tubes have perforations on their surface area in order to inhale the gases or the contaminated air.
- Air cleaner
- Air cleaner is usually used in the local exhaust type in order to remove the contaminated air which is taken by the ventilation at the very source.
- This usually requires a electric power in order to run the air cleaner. Size of the air cleaner may be determined by the type of the industry.
- In case of industry with toxic gases liberation the chemical process such as oxidation and hydration is carried to remove the gases from the air.
- In case of material contaminated air a centrifuge is used in order to remove the materials.
- When a centrifuge is implied, it rotates the contaminated air so that higher weight particles will be settled down.
- Blower is sometimes used in order to forcibly make a change in the direction of the air.
- This is used with the dilution type, in order to make the contaminated air mix with the non-contaminated air.
The ventilation system consists of different types of fans such as tube pressurizing fan and exhaust fan.
- Tube Pressurizing Fans
- This tube is usually present at the beginning of the source where it takes the contaminated air into it.
- This fan creates low pressure inside the tube so that the gases will travel quickly inside the tube.
- These can be made of either iron based alloy and aluminum alloys.
- Their working is very easy, they just create a low pressure in a region so that the air present around it will be inhaled creating an equilibrium.
- The surroundings of the pressurizing fan are to be fitted tight, in order to prevent the leakage of contaminated air.
- Exhaust Fans
- These fans are usually placed nearer to the outside environment.
- The exhaust fans just let the contaminated air go outside the working environment.
- These are similarly made of alloy steel or an aluminum alloy.
- Exhaust fans are used to create a high pressure so that the contaminated air will be exhaled out to attain the equilibrium.
- The exhaust fans surrounding are also to be air tight in order to prevent the leakage of air into the workplace.
There are many other parts in the ventilation system such as hoods, shutters, air filter etc which also play an important role in the working of the ventilation system.