The quality of mechanical ventilation systems in newly built Dutch dwellings

Abstract

The quality of mechanical ventilation systems (mechanical air supply and exhaust and natural air supply and mechanical exhaust) was studied in 299 recently built single-family houses. The quality of ventilation systems was determined by measurements as well as technical inspections for the aspects indoor air quality, thermal comfort and noise. The performance was generally poor for both types of ventilation systems. Common shortcomings regarding indoor air quality are insufficient air supply and exhaust rates, improper construction of ductwork, insufficient control options and poor maintenance. Common failings regarding thermal comfort are overheating if no 'bypass' section is installed as well as draught under air supply valves. Common shortcomings regarding noise are the position of the ventilation unit, the absence of properly installed silencers, and improper construction of ductwork. The overall poor performance seemed to originate from flaws in design, construction, maintenance as well as the use of the ventilation systems.