Air filtration for the control of the particle concentration within a school equiped with a balanced ventilation system

Résumé et principaux résultats

Abstract: To study the impact of the filtration efficiency level on the particle concentration in a school equipped with a balanced ventilation system, measurements of indoor and outdoor particle concentrations (0.3 to 10 µm) have been carried out. Three different efficiency filters (G4, F7 and F9 according to NF EN 779 (2012)) were used for the filtration of the incoming air. When the school is unoccupied, the I/O ratio (indoors to outdoors particle concentration) is lower than 1 and decreases as the filtration efficiency increases (close to 1 with G4 filters). When the school is occupied, the I/O ratio value is primarily controlled by the filtration for the smallest particles (diameter < 0.7 µm) and the I/O ratio decreases as the class of the filters increases; for the biggest particles which are generated indoors there is less influence of the filtration and the I/O ratio may largely exceed 1. Titre : Filtration de l'air pour le contrôle de la concentration en particules dans une école équipée d'un système de ventilation double flux Résumé : Article support d'une présentation à la conférence Indoor Air 2016, Gand, Belgique, 3-8 juillet 2016