Filters for asbestos work MUST be classified as a HEPA filter. These filters (cartridges) are a component of either a half face or full face respirator. You may find them at a full service building supply store, such as Home Depot, or through a safety supply vendor you can find in the yellow pages. There are some brands that are disposable, that is, use them once and throw them away with your asbestos waste. In addition to the respirator, purchase a paper (Tyvek) suit. You do not want to comtaminate your personal clothing and place this clothing into your laundry. If you have any additional concerns, you can contact me at: email@example.com. I have administrated my firm's asbestos program for the past 15 years.