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Ventilation guide for energy-efficient detached houses


​A new ventilation guide for energy-efficient detached houses provides guidelines for the implementation of a high-quality ventilation system in modern, energy-efficient and airtight new constructions.

Manufacturers and other industry players can utilise the guidelines when planning and implementing ventilation for energy-efficient detached houses. While the guide focuses on modern, energy-efficient detached houses, parts of it may also be of use in refurbishment projects.

Increased air tightness of buildings affects ventilation

Energy-efficiency of buildings has improved significantly over the past years with advances in HVAC and airtightness. At the turn of the 2000s, the air leakage figure n50 for new detached houses averaged at some 4 1/h. Today, houses easily reach levels below 1.5 1/h.

If the range of pressure differences created by mechanical ventilation is too wide, lighting fireplaces, managing separate air extraction and opening doors becomes more difficult.

Improved airtightness of building envelopes places special requirements on the planning and implementation of ventilation, management of pressure differences and air intake for separate air extraction.

Practical solutions                                                                      

The guide provides practical guidelines for implementing solutions such as cooker-hood extraction and how to best plan air intake for a central vacuum cleaner in an airtight house. It also presents solutions for ensuring that ventilation or the central vacuum cleaner dos not interrupt with the operation of fireplaces.

The guide also discusses the role of ventilation in the management of room temperatures in energy-efficient detached houses where rooms require very little heating and thermal loads exceed the required levels of consumption for most of the year.

Industry commissioned the guide

Ventilation plays a key role in indoor air quality and energy-efficient construction and should never be compromised to gain energy savings. 

It is important that equipment and house manufacturers have ventilation guidance at their disposal to avoid the negative impact of badly planned implementations on the reputation of energy-efficient construction.

To this end, the Finnish Association of Construction Product Industries (RTT) commissioned the guide from VTT Expert Services Oy. The project was financed by the Ministry of the Environment and several member companies of the Association of the House Manufacturing Industry (PTT) and the Finnish Association of Mechanical Building Services Industries.

The authors of the guide include VTT Expert Services' Senior Experts Mikko Saari and Mikko Nyman and Experts Arto Antson and Petri Kukkonen.

The guide is published in Finnish. It is free and available online.

Association of the House Manufacturing Industry (PTT)

Association of Mechanical Building Services Industries

Tel.+358 20 722 7070
Fax+358 20 722 7001

Opening hours 9:00 - 11:00 and 12:00 - 15:00, GMT +2 time zone


P.O. Box 47, FI-02151 Espoo, Finland
Tel. exchange +358 20 722 111
Opening hours Mon - Fri 8:00 - 16:30,
GMT +2 time zone
Fax +358 20 722 7001
Contact us

Tel. +358 20 722 7070
Fax +358 20 722 7001
Opening hours 9:00 - 11:00 and
12:00 - 15:00,
GMT +2 time zone