The 3M pre-filter TR-3600 is a high-quality accessory specifically designed for the 3M TR-302E+ blower unit. This pre-filter serves to extend the lifespan of the main filters by filtering out coarse particles and impurities from the air before they enter the filtration system. With a pack of 10 pieces, this pre-filter offers a practical solution for regular replacement and maintenance of protective equipment. The pre-filter is available in the classic color black and is made in Canada, which speaks to its high quality and reliability. The use of the pre-filter is particularly important in environments where clean breathing air is essential, such as in industrial settings or during manual work. With its ease of use and effective protection, the 3M pre-filter TR-3600 helps ensure the safety and health of users.