Hi! I am sorry for interfering with divers' topics, but I think I may find help here. I promise I won't bother you eternally. I am not a diver, but maybe someone here can give me an idea. I have a 16 year old who has to take a bunch of exams this year in order to continue to college. He has not been vaccinated because of an inflammatory process he is undergoing. Anyways, the thing is he will have to take 2-3 exams, which are about 3-4 hour long each, with a tight mask on. He is in 12th grade, so postponing the exams for next year is not a solution anymore. If he gets Covid, with the problem he has, he may not make it. If he does not take these exams, he will not graduate. Even if the school allows him to keep postponing, it seems covid will stick around for a loooong time. I am looking for a way to blow air under his covid mask. He does not qualify for medical oxygen and doctors are afraid to give me a prescription. I have tried, but there is too much fraud going on with this. I have looked around and all the portable air purifiers promise to filter air, but when I read the specifications of the filters, it seems to me that far from protecting him, the equipment would be blowing whatever is in the air right to his face. The safest way is using a tank. After failing to get an order for an oxygen tank, I then thought of a scuba tank. I have to be honest. I do not know anything about this. I read somewhere that scuba tanks and oxygen tanks have different valves. My question is if anyone here can think of a way to attach a thin oxygen hose (like the ones with the two cannulas that go in the nostrils) to a scuba tank valve or even a scuba hose? Again, he does not need oxygen specifically. The mix divers use would be fine. It would be only to minimize the vapor, heat, and the uncomfortable sensation that covid masks cause when we use them for so many hours. This way, he can keep his mask on during the length of the exam and be able to concentrate on the exam itself. Thank you beforehand for any ideas you can provide.