Ultra duster canned air. This 3.5oz can of Blow Off Air Duster canned air is what you need to clean dust from your home. Blow Off canned air is ideal for dusting off electronics such as PCs, printers, home theater systems and keyboards as well as other household dust collectors like decorative figurines, china, photo equipment, and more. This air duster can provides 3.5oz of compressed air that has been cleaned and sterilized before packing. Blow Off Duster ~ 3.5oz Canned Air. Max Professional 2240 Blow Off 152a Duster 3 5 Oz Pack of 12. Max Professional Blow Off 2240 3.