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njbbari3.bsky.social Dr Noor Bari @njbbari3.bsky.social · Dec 9
Got flu problems?

Try this.
To be used with masks as part of a complete strategy. Safer Indoor Air for Kids Mechanically OR Naturally Ventilated? • schools • out of hours care • day-care • youth groups • clubs • anywhere kids get together Mechanically Ventilated Call a mechanical engineer to review the HVAC system. C02 Monitors LOW RELATIVE RISK • Below 800ppm/ MODERATE RELATIVE RISK • 800-1500 ppm • work to improve indoor air quality to low relative risk range HIGH RELATIVE RISK • Above 1500 ppm • moderate risk reading not improving • Leave room until air quality improved, • Increase ventilation bringing outdoor air indoors. • Use HEPA filters with ventilation to assist if occurs repeatedly. • Reduce occupancy or cease activity causing high risk air quality. Naturally Ventilated Open windows and doors where it is safe to do so. Complete the recommended work to increase outdoor air intake. Once the building is in use, monitor the ventilation with CO2 monitors. Work to create a cross breeze of fresh air. On still days may use a child safe fan." Use Portable HEPA filters if ventilation is not enough. Portable HEPA filters • Use filtration to clean the air, do not add anything to the air. • Use the right size and avoid low flow settings. • CADR = clean air delivery rate • Aim for an equivalent of minimum 6 air changes per hour (ACHe) • ACHe X Room volume = CADR needed • Use of more filters may allow for less noise. • HEPA filters will not lower the CO2 reading on the monitor. *Fans, if used, must be ploced to direct indoor air outside & encouroge cross ventilation. Take core not to recirculate, including avoiding the use of split system air-conditioning For more detailed odvice & warnings please see OzAGE document for Safe Indoor Air. While the building is in use monitor the ventilation with CO2 monitors. Use Portable HEPA filters if ventilation is not enough, outdoor air is polluted or bad weather OZSAGE
December 9, 2025 at 12:57 PM