Masks with vent decrease the effectiveness of the seal,” he continued. "Masks with one-way valves or vents allow exhaled air to be expelled out through holes in the material.

"Masks with one-way valves or vents allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others," the CDC says.

Q: What’s your take on the Ecovent dryer vent? I understand the need for a vent that effectively keeps out cold air, but I’m concerned about the foam ball that acts as a valve inside this product.