Page 7 - Energy Recovery Ventilation

Calculation of Ventilation Rates Suitable for Objectives

The required ventilation rate varies depending on factors such as the type of living room, the use of
Ventilation heating appliances, the generation of heat and steam, and so on. In all cases, it is necessary to calculate
Calculation
the ventilation amount appropriate for the purpose of the location where the ventilation unit is installed.

Standards for Required Ventilation per Person Established Ventilation Frequency Standards
by the Ministry of Land, Infrastructure and Transport
: Annex 1 of Article 2 of the Supplementary Provisions of the Building Act, revised on December 4, 2017. Required Ventilation Rate/Volume (CMH) =
Ventilation Frequency Per Hour (times/h) × Interior Air Volume (m3)
Classification of Multi-Use Facilities Required Ventilation Rate (m3/person·h)
Underground Underground Subways 25 or more Installation Location Frequency (times/h)
Facilities Underground Shopping Malls 36 or more Restaurants 15
Cultural and Assembly Facilities 29 or more
Bathrooms 10–12
Retail Facilities 29 or more Classrooms 6–8
Transportation Facilities 29 or more Offices 6
Funeral Halls 36 or more
Medical Facilities 36 or more
Educational and Research Facilities 36 or more Based on Room Area
Facilities for the Elderly and Infants 36 or more
Business/Office Facilities 29 or more Required Ventilation Volume (CMH) =
Automotive Facilities 27 or more Ventilation Rate per Area (m3/m2·h) × Room Area (m2)
Other Facilities 25 or more
A) When calculating the floor area and total floor area, it is based on the floor area or total floor Classification of Room Types Ventilation Rate by Room Area (m3/m2·h)
area occupied by the facilities installed in the indoor space.
B) The required ventilation volume is calculated based on the time period when the expected Individual 6.0
number of users is highest. Offices
C) In the case of rooms used for special purposes such as operating rooms among medical Office General
facilities, the head of the relevant central administrative agency may establish or determine 7.2
different standards. Offices
D) For facilities related to automobiles, the required ventilation volume is calculated as the venti- Shops, Stores 9.1
lation rate per unit area (m3/m2·h).
Restaurants 30–17.7
Banquet Halls 37.5
Based on Occupancy Hotels, Guest Rooms 3.0
Conference Rooms 30
Required Ventilation Volume (CMH) = Beauty Salons, Barber Shops 6.0
Ventilation Rate per Person (m3/h) × Number of People
Residence, Apartments 9.0
Commercial 30.0
Restaurants Non-
Based on Area Occupied per Person commercial 15.0
Lounges 15.0
: Based on the CO₂ emission rate (20 CMH) when an adult male is sitting quietly

Required Ventilation Rate/Volume (CMH) =
20 (CMH) × Room Area (m2) ÷ Occupancy Area per Person (m2) Example of Apartment Ventilation Rate Calculation

Category Occupancy Area per Person (m2) Required Ventilation Rate/Volume (CMH) =
Church assembly halls, gymnasiums 0.5–1 Room Area (m2) × Room Height (m) × 0.5 times or more
• Based on 115 m2 (35 Py): 115 m2 × 2.3 m × 0.5 = 132.25 CMH
Theaters, cinemas, banquet halls 0.5–2 150 CMH product application
Inn, hotels, motels 10 • Based on 165 m2 (50 Py): 165 m2 × 2.3 m × 0.5 = 189.75 CMH
Hospitals, clinics, offices 5 200 CMH product application
Department stores 2
* Please note that actual areas like bathrooms and balconies are excluded when calculating
Restaurants 2 ventilation rates, so the calculated values may be lower than the examples given

07 ENERGY RECOVERY VENTILATION