Diy calculation and diagram of the spray booth ventilation system

Work in the spray booth is significantly complicated by the suspension of chemicals, including the smallest particles of paint. They are harmful to the paint shop personnel and degrade the quality of work. Therefore, it is necessary to equip the spray booth ventilation system. Effective work is only possible after careful calculation of the spray booth ventilation. The calculations are very important, as the accumulation of harmful vapors can cause poisoning, fire and explosion.

Calculation of paint shop ventilation

Typically, the ventilation design is based on the area of ​​the room. When calculating the ventilation of the spray booth, the size of the painting object must also be taken into account. It can be a pair of car doors or a whole body. This is why an accurate calculation is needed. When painting small-sized parts, the air in the room should be changed 5 times per hour (if painting is carried out without sprayers).

If large parts are painted with a spray gun, air exchange should be carried out 20 - 100 times in one hour.

In this way:

• The spray booth ventilation system will be quite expensive for the owners of large workshops;
• At the same time, ventilation ensures the health of workers and reduces the likelihood of accidents (fires) in the workshop;
• Large paint shops are almost completely automated, which further increases the percentage of air pollution.

Do-it-yourself spray booth hood

If the size of the workshop is approximately 4 by 6 meters (the size of a standard garage), you can equip the spray booth ventilation with your own hands. However, the worker should only paint in a respirator and protective suit.

A supply and exhaust ventilation scheme for the spray booth is used. The inflow rate must exceed the outflow rate.

Most of the chemicals used in such workshops are explosive. Therefore, it is necessary to install explosion-proof check valves in ventilation shafts. Also, the ventilation scheme for the spray booth depends on the type of reagents used in the workshop:

• If the vapors of reagents are lighter than atmospheric air, it is necessary to organize the outflow of 70% of the air from the upper part of the room and 30% from the lower part;
• If they are heavier, pull 70% from the bottom and 30% from the top.

When equipping spray booth ventilation with your own hands, special hoods should be installed above:

• Tables and racks for painting;
• Baths for painting (parts and components are immersed in them);
• Blasting machines;
• Systems for degreasing parts.