MVHR is a whole house system that extracts air from wet rooms while supplying fresh, filtered air into habitable rooms.It must meet the whole dwelling ventilation rates set out in Table 1.3The heat recovery minimum efficiency has increased from 70% to 73%The extract airflow must match the supply airflow to...
Continuous Mechanical Extract (previously known as System 3)
A continuous mechanical extract ventilation system could consist of one of the following.A central extract system is known as MEV (mechanical extract ventilation).Individual rooms with continuous extract fans are known as dMEV (decentralised mechanical extract ventilation).A combination of both MEV and dMEV.It also requires correctly sized and fitted trickle vents...
Why is it important to ventilate?
Why is it important to ventilate?Ventilation is necessary to provide a healthy and comfortable internal living environment. The main goal of ventilation is to replace polluted indoor air with fresh outdoor air through purpose-provided openings. The Approved Document Part F (means of ventilation) of the Building Regulations for England and Wales...
Airtightness Standards and Regulations
Changes to the New Build regulation as of June 2022.The ability to sample test has ceased, and all new builds must be tested.Singular self-builds are no longer able to claim an exemption from testing.The general requirement is for dwellings tested to comply with a maximum air permeability of 8m³/(h¹.m²) @...
Airtightness Checklist
Airtightness ChecklistOur airtightness checklist is designed to help developers monitor airtightness throughout their projects. It is intended as a guide only. Where complicated junctions are involved, or construction is undertaken with different build systems, we advise you to seek our advice for your specific project.Don't hesitate to contact us for...