Comparison of air filtration/ventilation at a restaurant table.
Smoke machine flicked on every 15 seconds, video sped up 10x. With ventilation, smoke is continuously cleaned. Without, it builds up.
In an unventilated space, you're breathing exhaled air from other people.
Smoke machine flicked on every 15 seconds, video sped up 10x. With ventilation, smoke is continuously cleaned. Without, it builds up.
In an unventilated space, you're breathing exhaled air from other people.
Same video, showing the other half. 7' acrylic wall separating tables, HEPA air purifiers on both sides of the wall.
With one "puff," a particle counter maxed at 999. At the other table, it read between 25-75 (HEPA on), so I'm confident that very little exhaled air is shared..
With one "puff," a particle counter maxed at 999. At the other table, it read between 25-75 (HEPA on), so I'm confident that very little exhaled air is shared..
between guests. (Another particle counter showed 3300, but it only took sporadic readings. ~50/3300 = 1.5%)
Should mention the measurements were with the smaller air filters that we actually use at the tables. For the video, I used the larger ones for greater visual contrast.
Should mention the measurements were with the smaller air filters that we actually use at the tables. For the video, I used the larger ones for greater visual contrast.
Should also mention this is at Osteria Du, where we actually did have a covid+ guest in December:
https://twitter.com/roger_yang_to/status/1473059171604086793?s=20&t=1d5JX36wLbOGDldhEMV3Dg
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