Forced air Respirators
This protection method is the best solution for professionals that will be working with a product over extended periods. If you are painting cars for a living or if you are an asbestos tech that is cleaning basements then you need to make sure that no chemicals or particulate ever enters your system. For this you need to wear a mask that has clean air piped to it.
Forced air respirators are a very specific tool that need proper planning and instruction. Once you know what you are doing they will become second nature but you must take precaution when installing a forced air system that the position of the equipment in the shop will provide fresh air at all times and will not be contaminated by your work area.
For this reason it is best if you visit your local Auto Body Supply shop and get the names of manufacturers that they carry and then go to their websites and learn how the products work before you install and use them.