Holopainen R, Asikainen V, Blorkroth M, Tuomainen M, Kovanen K, Pasanen P, Seppanen O
Year:
2001
Bibliographic info:
Italy, Milan, AICARR, 2001, proceedings of the 7th REHVA World Congress and Clima 2000 Naples 2001 Conference, held Naples, Italy, 15-18 September 2001, paper on CD.

This study was based upon a laboratory comparison of two air duct cleaning methods, mechanical brushing and compressed air cleaning. These methods were compared in three types of round air ducts: a metal duct without oil residual, a metal duct with oil residual, and a plastic duct. The level of cleanliness was estimated both by using the vacuum test method and visually, and the time each method took was recorded. Two rotating speeds of the brush and various brush materials were used. These two variables and a third - the moving speed of the brush in the duct - affected the cleanliness level of the ducts. Mechanical brushing was more effective and faster in metal ducts than using compressed air. The depth of dust left on the duct surfaces was on average 0.2 -0.8 g/m 2 after brushing. Compressed air was the more efficient of the two methods in plastic air ducts but unfortunately it was also slower and noisier. The average depth of residual dust in the ducts was 0.1 -1.0 g/m 2 after compressed air cleaning.