That is a good question,  I can tell ya I have never had anyone else use mine but I have picked up and put on my bro's dust mask by mistake       I would probably find somthing to dissinfect  the inside with.

Andy, think about it the same way as using a tissue to blow your nose after somebody just used it on thiers I'd say you'd at least have to get a different mask for each one using it.....

Good point Mike but the one I tried out was like a hard hat with a face shield, and there was a shower cap like elastic thingy that fitted loosely around your neck. Nowhere near like using someone elses respirator and sucking their backwash bad breath in. The positive air flow takes all that away and it is no different than wearing somebody elses hat. Just watch out for Cooty bugs.

Oh, wifey sometimes want to use my hanky. I fight but always loose. "I'm only going to use the corner".

  " oh the wifey wants to use my hanky'        Have you ever been offered a beer while you are with your wife and you accept (duh) and she doesn't?    Then what happens?    all together now...  "SHE DRINKS YOURS"!         "I'll just have a sip"

My wifey has a hollow leg!                      (gonna have to change my password now)

   Oh ya, respirators... ya respirators

I bought one and it works very well.  It has a rechargable battery pump that blows in filtered room temp air that makes it easy to breath and keeps fog off the mask.

I don't use it very often.  We run a wet shop for our stone but occasionally the time comes when I need to make an odd cut with an electric grinder dry.  I push the table outside or use a dust hood and cut while wearing the helmet.  It is much more comfortable and cooler than using a traditional respirator. 

JC, your dad's 86? God bless him. I have an aunt who is 91, still goes bowling once a week and is the life of any party. I think she arm wrestles to....

My sons have a great grandma, she's 95 and can still keep both of them in line. I always tell the boys that the stories Great Grandma tells you might be boring, but the bottom line is you're getting a history lesson live and you'll cherish it more when you become an adult.