Mechanical ventilation and portable air cleaner for aerosol
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Researchers have said that aerosol accumulation may occur in dental treatment rooms with poor ventilation. The addition of a portable air cleaner (PAC) with a HEPA filter will significantly reduce aerosol accumulation.

The objective of this study by the Journal of Dentistry was to evaluate the mechanical ventilation rates of dental treatment rooms and assess the effectiveness of aerosol removal by mechanical ventilation and a PAC with a high-efficiency particulate air (HEPA) filter.

Volumetric airflow was measured to assess air change rate per hour by ventilation (ACHvent). Equivalent ventilation provided by the PAC (ACHpac) was calculated based on its clean air delivery rate. Concentrations of 0.3, 0.5, and 1.0 ?m aerosol particles were measured in 10 dental treatment rooms with various ventilation rates at baseline, after 5-min of incense burn, and after 30-min of observation with and without the PAC or ventilation system in operation. Velocities of aerosol removal were assessed.

Study findings were;
--ACHvent varied from 3 to 45. ventilation alone (Kn) and
ventilation and PAC (Kn+pac) were correlated with ACHvent and combined ACHtotal respectively.

--Accumulated aerosol particles could not be removed by ventilation alone within 30-min in rooms with ACHvent<15.

--PAC reduced aerosol accumulation and accelerated aerosol removal, and accumulated aerosols could be completely removed in 4 to 12-min by ventilation combined with PAC.

--The effectiveness of the PAC was especially prominent in rooms with poor ventilation. An added benefit of PAC in aerosol removal was inversely correlated with ACHvent.

In conclusion, aerosol accumulation may occur in dental treatment rooms with poor ventilation. Addition of PAC with a HEPA filter significantly reduced aerosol accumulation and accelerated aerosol removal.

Source: https://doi.org/10.1016/j.jdent.2020.103576
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