An N95 mask doesn't "stop" coronavirus either, that's the 95 part of it. A bedsheet would absolutely reduce viral load you spread, even at naïve assumption of

An N95 mask doesn't "stop" coronavirus either, that's the 95 part of it. A bedsheet would absolutely reduce viral load you spread, even at naïve assumption of the size - simply because it's an obstacle that inevitably catches some of particulate and reduces the airflow range. But coronavirus is spread in suspended aerosol particles 3µm or so in size, which are filtered out even more efficiently by a wide range of materials.