JanSan Compatible Numatic Microfibre Dry Filter Vacuum Bags that fit any of the 180, 200 and 250 ranges of machines from Numatic including the 'James', 'Henry' , Hetty , Harry, Bertie and 'Henry Xtra' vacuums. - The material helps give your vacuum maximum air, and ensure the collected dust is evenly distributed.- The inner layer performs as the first filter, helping to prevent pores from getting blocked - and so helps the bag maintain its strength.- The Filter-Flo dust bag filters the air 40% more efficiently than a normal paper bag and helps you get rid of airborne particles such as, for example allergens and some bacteria.- Ideal for people with allergies. Fits : Henry, Hetty, James, Basil, Harry- The inner layer performs as the first filter, helping to prevent pores from getting blocked - and so helps the bag maintain its strength.- This part is a non genuine compatible spare part and the manufacturers names and part numbers have been used for reference purposes only. Specifications