If you’ve arrived at this page the most relevant documents you’re searching for are probably:
- Technical Booklet K (Ventilation) Building Regulations 2012
This covers the requirements for the main strategies for Domestic Ventilation, generally adopted in Northern Ireland. NB always check https://www.finance-ni.gov.uk/articles/building-regulations-technical-booklets for the most up to date versions of the Building Regulations for Northern Ireland.