Author: Nazaroff, William W
Title: Indoor bioaerosol dynamics Document date: 2014_12_27
ID: 6cargkwy_49
Snippet: In the case of a mechanically ventilated building, a second important parameter is the efficiency of a particle filter in the flow path connecting outdoor air to the air supply registers. Figure 12 illustrates two important points about filter efficiency. First, it is highly variable with filter quality, ranging from low for filters with a MERV 4 rating to high for MERV 13 or MERV 16 filters. Second, filter efficiency can vary markedly with parti.....
Document: In the case of a mechanically ventilated building, a second important parameter is the efficiency of a particle filter in the flow path connecting outdoor air to the air supply registers. Figure 12 illustrates two important points about filter efficiency. First, it is highly variable with filter quality, ranging from low for filters with a MERV 4 rating to high for MERV 13 or MERV 16 filters. Second, filter efficiency can vary markedly with particle size. Across the range that is pertinent for bioaerosols, the filtration efficiency tends to be higher for larger particles than for smaller particles. A mechanically ventilated building with a high mechanical ventilation to infiltration flow rate ratio (Q M /Q L ≫ 1) and a high-efficiency filter (1Àg M ( 1) can provide a high degree of protection of the indoor environment from outdoor bioaerosols.
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