1. What is the Extractor Fan Flow Rate?

The extractor fan flow rate determines how much air the fan can move per hour. It's calculated based on the room volume and the required air changes per hour (ACH) for proper ventilation.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• Room Volume — The volume of the space in cubic meters (m³)
• ACH — The number of times the entire air volume should be replaced per hour

Explanation: The equation calculates the minimum required fan capacity to achieve the desired air changes in the specified room.

3. Importance of Proper Ventilation

Details: Proper ventilation is crucial for maintaining indoor air quality, removing pollutants, controlling humidity, and preventing condensation and mold growth.

4. Using the Calculator

Tips: Measure your room dimensions accurately to calculate volume (length × width × height). Typical ACH values range from 6-15 for kitchens and 10-20 for bathrooms.

5. Frequently Asked Questions (FAQ)

Q1: What are typical ACH values for different rooms?
A: Kitchens: 6-15, Bathrooms: 10-20, Workshops: 6-12, Living areas: 4-6.

Q2: How do I calculate room volume?
A: Measure length × width × height in meters. For irregular rooms, divide into regular shapes and sum the volumes.

Q3: Should I add extra capacity to the calculated flow rate?
A: Yes, it's recommended to add 10-20% to account for duct resistance and filter loading.

Q4: What if my room has high ceilings?
A: For rooms with ceilings over 2.7m, consider using the actual volume rather than standard height assumptions.

Q5: How does duct length affect fan performance?
A: Longer ducts increase resistance, requiring higher static pressure. Consult fan performance curves for specific installations.