@jlindy77 @DonotInnovate @whstancil The baseline can be standalone HEPA filters in every single classroom and then schools can evaluate further improvement to HVAC based on local conditions. HEPA filters alone are a large improvement.
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@jlindy77 @DonotInnovate @whstancil 基线可以是每个教室中的独立 HEPA 过滤器，然后学校可以根据当地条件评估 HVAC 的进一步改进。仅 HEPA 过滤器就是一个很大的改进。
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