✅ Checklist for Ventilation Provision in Existing Dwellings
In this blog we give you an extensive checklist for ventilation provision in existing dwellings.
Ensuring adequate ventilation in existing dwellings is essential for maintaining indoor air quality, preventing condensation and mould, and complying with Approved Document F, Volume 1: Dwellings.
Whether you’re assessing natural ventilation, continuous mechanical extract systems, or mechanical ventilation with heat recovery (MVHR), this checklist will guide you through the key compliance points.
🌬️ Natural Ventilation
Natural ventilation relies on background ventilators and windows to provide fresh air. Here’s what to check:
- Total Equivalent Area: Measure the total equivalent area (EA) of background ventilators in mm². Does each habitable room meet the minimum EA standards in Table 1.7(2)?
- Ventilator Position: Are all background ventilators left in the open position?
- Fan and Ventilator Separation: Are fans and background ventilators in the same room at least 0.5m apart?
- Wet Room Extraction: Are there working intermittent extract fans in all wet rooms?
- Fan Quantity: Does the number of fans meet the standards in Table 1.1?
- Fan Location: Are fans located as specified in paragraph 1.20?
- Manual Override: Do all automatic controls have a manual override?
- Purge Ventilation: Does each room have a system for purge ventilation (e.g., openable windows)?
- Opening Area: Do window openings meet the minimum standards in Table 1.4?
- Internal Door Undercuts: Do internal doors have sufficient undercut (10mm above floor finish or 20mm above floor surface) as per paragraph 1.25?
⚙️ Continuous Mechanical Extract Ventilation
This system uses fans to continuously extract air from wet rooms. Check the following:
- System Type: Does the system use a central fan, individual room fans, or both?
- Continuous Rate: Does the total combined extract rate meet Table 1.3 standards?
- High Rate Extraction: Are high-rate extractions compliant with Table 1.2?
- Wet Room Ventilators: Are background ventilators absent in wet rooms?
- Habitable Room Ventilation: Do all habitable rooms have a minimum EA of 5000mm²?
- Purge Ventilation: Are windows or other purge systems present in all rooms?
- Opening Area: Do window openings meet Table 1.4 standards?
- Internal Door Undercuts: Are door undercuts compliant with paragraph 1.25?
🔁 Mechanical Ventilation with Heat Recovery (MVHR)
MVHR systems supply and extract air mechanically while recovering heat. Ensure the following:
- Supply Ventilation: Does each habitable room have mechanical supply ventilation?
- Continuous Rate: Is the total ventilation rate compliant with Table 1.3?
- High Rate Extraction: Are high-rate extractions compliant with Table 1.2?
- Background Ventilators: Have all background ventilators been removed or sealed?
- Purge Ventilation: Are purge systems (e.g., windows) available in all rooms?
- Opening Area: Do window openings meet Table 1.4 standards?
- Internal Door Undercuts: Are door undercuts compliant with paragraph 1.25?
📝 Additional Notes
- Visual Inspection: Always check for signs of mould or condensation. If present, consider installing additional ventilation or consult a specialist.
- Reference: All standards and paragraph references are from Approved Document F, Volume 1: Dwellings.
🏡 Stay Compliant, Stay Healthy
Proper ventilation is not just a regulatory requirement—it’s a cornerstone of a healthy home. Use this checklist during inspections or retrofits to ensure your dwelling meets the latest standards.
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If you have any questions or need assistance with domestic ventilation, don’t hesitate to contact us at Building Compliance Testing Limited.