Best helmet I ever used. I would like to know what I need to buy to use this helmet outside in the winter we do alot of work in scrap yard industrie need to have heated air coming in to helmet. I use the batterie pack pack do they have a heating unit for that or do have to buy something else. If so can you derect me were I may buy what I need to work in the cold. 3M 9100FX ADF-26-1101-30-SW
Thanks Rick