The "24-hour ventilation system" installed in relatively newer apartment buildings. It began to be introduced following the 2003 revision of the Building Standards Act, but why is it necessary? In this article, as basic knowledge about apartment building systems, we explain the advantages and disadvantages of 24-hour ventilation and the points for using it comfortably.
What is a 24-hour ventilation system, and why is it necessary?
A 24-hour ventilation system is equipment that continuously circulates and replaces the air inside a home around the clock. Its introduction became mandatory with the 2003 revision of the Building Standards Act.
Background to its introduction: Sick house syndrome became a social issue
In homes with higher airtightness due to energy-efficient design, chemical substances such as formaldehyde contained in building materials became more likely to accumulate indoors. As cases of sick house syndrome increased, causing symptoms such as eye and throat pain, headaches, and breathing difficulties, 24-hour ventilation was made mandatory.
Three types of ventilation systems
- Type 1 ventilation: Both air supply and exhaust are handled mechanically. Many systems include heat exchange functionality
- Type 2 ventilation: Air supply is mechanical, while exhaust is natural ventilation. Suitable for specialized uses such as clean rooms
- Type 3 ventilation: Air supply is natural, while exhaust is mechanical. This is the most common type in apartment buildings
What are the advantages of a 24-hour ventilation system?
Continuous ventilation provides many benefits.
Indoor air quality can be kept clean at all times
It can continuously remove formaldehyde and CO2, helping maintain a healthy indoor environment.
Condensation and mold growth can be reduced
By discharging moisture appropriately, it helps prevent condensation on windows and walls and can significantly reduce the risk of mold growth.
It can reduce the intrusion of pollen and PM2.5
By using an air intake with a filter, you can ventilate without opening the windows, which also helps with pollen allergy measures.
What are the disadvantages of a 24-hour ventilation system, and how can they be addressed?
While it offers many benefits, the following points require attention.
Indoor temperature changes due to the influence of outdoor air
In winter, cold outdoor air comes in, and in summer, warm air enters, so heating and cooling efficiency may decline. With a heat-exchange ventilation system, this impact can be kept to a minimum.
It increases electricity costs
Because it operates 24 hours a day, electricity costs are incurred, but a few hundred yen per month is typical.
Regular filter cleaning is necessary
If the filter becomes dirty, ventilation efficiency declines, so cleaning about once every three months is recommended.
Frequently Asked Questions (FAQ)
Q. Is it okay to turn off the 24-hour ventilation system?
In principle, it is recommended not to turn it off. If you do, it may cause sick house syndrome, condensation, and mold.
Q. How much does 24-hour ventilation cost in electricity per month?
For a Type 3 ventilation system, around 300 to 500 yen per month is typical. If viewed as an investment in health, it is very reasonable.
Q. What should I do if a property does not have a 24-hour ventilation system?
Buildings constructed before 2003 may not have one installed. Open the windows regularly for ventilation and make use of exhaust fans. Opening windows on opposite diagonal sides is especially effective.
