Regulations: Background Ventilation in Republic of Ireland

Introduction

The provision of background ventilation via through-wall ventilators and window trickle ventilators is a cost-effective, non-mechanical means of introducing fresh outside air into habitable rooms.  Easy to operate and fully controllable, natural background ventilators dilute and remove airborne pollutants (including odours) from rooms and control moisture to reduce the risk of mould growths which can be a health hazard to the occupants.

National Retrofitting Scheme
Extracts from NSAI SR54: Code of practice for the energy efficient retrofit of dwellings
  • For detailed guidance, refer to the full code of practice available to download here.
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General notes:

  • Provide controllable background ventilation in all rooms with external walls to the values set out in the following tables.
  • Where Mechanical Extract Ventilation (MEV) is installed, provide background ventilation of at least 3,125mm² equivalent area per habitable room.
  • Promote cross-ventilation with background ventilation of a similar area on each façade, where possible.
  • Position background ventilators more than 1.75m above floor level to reduce draughts but still be accessible by the occupant.  Note: Background ventilators should normally be left open.

Use table 31 for air permeability levels ≥5m³/hr/m²

Use table 32 when air permeability is expected to be <5m³/hr/m²

Extracts from Building Regulations 2019, Technical Guidance Document F: Ventilation
  • For detailed guidance, refer to the full technical document available to download here.
Background ventilators

General notes:

  • The guidance is only for dwellings with air permeability between 3m³/(h·m2) at 50 Pa and 5m³/(h·m2) at 50 Pa, as Technical Guidance Document L sets 5m³/(h·m2) at 50 Pa as the upper limit for air permeability.
  • Install background ventilators in all rooms with external walls.  The minimum total equivalent area of background ventilators required in each room is given in the table below.
  • Promote cross-ventilation with background ventilation of a similar area on each façade, where possible.
  • Position background ventilators more than 1.75m above floor level to reduce draughts but still be accessible by the occupant.  Note: Background ventilators should normally be left open.
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Rytons Background Ventilation Range

Achieve compliant background ventilation in habitable rooms with Rytons controllable through-wall background ventilators or a combination of window trickle vents and through-wall sets.  We are always happy to assist you with ventilation calculations and product selection; call our technical sales office on 01536 511874 for advice.

Rytons Through-wall Background Ventilation Sets
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Rytons Window Trickle Ventilators
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