The AF Sprayduster is ideal for accessing hard to reach places and provides a thorough clean with compressed air. It is particularly well suited for cleaning computer keyboards and removing built-up dust from fans and heaters to improve air flow and prevent overheating. This sprayduster is specially designed to have zero pressure drop in use, is safe to use and more environmentally friendly than traditional spraydusters. The invertible design lets you use it either way up for easier cleaning. Control the strength of compressed air released with 3 settings. Compliant with F-gas regulations 01/01/2018. Each can contains 420ml for long lasting use.