The proper and efficient functioning of ventilation systems plays a crucial role in ensuring a healthy indoor environment, which in turn positively impacts the health and well-being of those living or working in the space.
NB Group offers advanced ventilation systems that ensure maximum comfort, safety, and energy efficiency.
Industrial ventilators are used to create ventilation systems in commercial and industrial spaces, shopping centers, offices, restaurants, medical facilities, factories, and more.
Household ventilators provide forced air supply and extraction in residential spaces. They are installed in ventilation shafts or ducts and are mainly used for humid and contaminated areas such as bathrooms, toilets, and kitchens.
The required airflow, as well as the appropriate number and performance of ventilators, is determined individually for each space, considering the presence of harmful substances and heat loss.
If it is impossible to determine the exact type and amount of harmful substances, air exchange is calculated based on its circulation frequency.
Air Exchange Calculation
L = V * K (m³/h)
Where:
V – Building volume, m³
K – Minimum air exchange rate per hour
How to Determine the Building Volume?
To calculate the total volume of a building in cubic meters, use the following formula:
Length x Width x Height = Building Volume
A x B x H = V (m³)
Example: If a building has a length of 7m, a width of 4m, and a height of 2.8m:
7 x 4 x 2.8 = 78.4 m³
Using the recommended air exchange rate table below, we can determine the required ventilator capacity.
Determining Air Exchange Based on the Number of People
L = L1 x NL (m³/h)
Where:
L1 - Air requirement per person, m³/h
NL - Number of people in the space
Recommended Air Requirements Per Person:
20-25 m³/h for minimal physical activity
45 m³/h for light physical work
60 m³/h for heavy physical work
Determining Air Exchange for Humidity Control
L = D / (dv - dn) x ρ (m³/h)
Where:
D – Released humidity, g/h
dv – Extracted air humidity, g of water per kg of air
dn – Incoming air humidity, g of water per kg of air
ρ – Air density, kg/m³ (at 20°C = 1.205 kg/m³)
Determining Air Exchange for Heat Removal
L = Q / (ρ * Cp * (tv - tn)) (kg/m³)
Where:
Q – Heat emission in the room, kW
tv – Extracted air temperature, °C
tn – Incoming air temperature, °C
ρ – Air density, kg/m³ (at 20°C = 1.205 kg/m³)
Cp – Air heat capacity, kJ/(kg·K) (at 20°C; Cp = 1.005 kJ/(kg·K))
Recommended Air Exchange Rate Table
|
Industrial Spaces |
Air Exchange Rate |
|
Theater, Cinema, Conference Hall |
20–40 m³ per person |
|
Office |
5–7 |
|
Bank |
2–4 |
|
Restaurant, Bar, Café |
9–11 |
|
Restaurant/Café Kitchen |
10–15 |
|
Department Store |
1,5–3 |
|
Retail Store |
3 |
|
Auto Repair Shop |
6–8 |
|
Public Toilet |
10–12 (or 100 m³ per toilet unit) |
|
Gym |
Minimum 80 m³ per active person, Minimum 20 m³ per spectator |
|
Warehouse |
1–2 |
|
Swimming Pool |
10–20 |
|
Industrial Painting Workshop |
25–40 |
|
Workshop |
3–5 |
|
School Classroom |
3–8 |
|
Household Spaces |
|
|
Apartment/Living Room |
3 m³/h per 1 m² of living space |
|
Kitchen |
6–8 |
|
Bathroom |
7-9 |
|
Toilet |
8–10 |
|
Garage |
4-8 |
|
Basement |
4-6 |