Quoted from pinmeds:

Here in Ottawa, they just shut down indoor dining again a few weeks ago, and the average daily high is now approaching 5C or 40F. Patios are still barely hanging on, but impossible to heat with two walls open which is required. After it drops below 60F, there aren't that many die-hards that come out.
My concern, being in Canada, is the very low relative humidity (40% or lower indoors at room temperature), combined with closed heating systems in well insulated buildings, provides the perfect environment for respired aerosols to remain suspended in the dry air for prolonged periods and migrate through the entire area.
My pre-pinball career was in Water Damage and Asbestos & Mold Remediation, where psychometry, containment, ventilation including positive and negative pressure differentials, particulate filtering, as well as PPE were my stock and trade, and following this thread I can't agree more about the main variable that must be maintained to provide any degree of actual (not just perceived) safety is maximum ventilation and constant fresh air. The amount of HEPA filtration required to make it safe in a fully closed system would cost far more to purchase, install, and operate than I would ever earn, and I'd still have to close as we are again mandated now even if I wanted to stay open. With regular flu season just about to kick in, I'm concerned the far more contagious Covid will really take off in restaurant/bar/arcade/barcade scenario in our climate.
I've been closed since March and have repurposed my arcade into a retail showroom, repair facility, and parts store in anticipation that I will not open again until at least next summer, but hopefully further South you guys can keep going through the winter months. Best of luck to all!