Hi, I don't know if what I done would fit for others in this forum: my air passages are very wide because I do not have middle turbs anymore and do not have much of inferior ones, so I guess it will be difficult to me to not have air passing even with this little piece of fabric on my face. Anyway, I did not cover the entire nose and I tried it entire afternoon, before sleeping, to be sure it would not suffocate me. My right side is worse, so I covered it more than the left side.