Abstract: An auxiliary device for filter exchange in an air filtering system of a clean room for allowing easy exchange of the filter used in the clean room. The auxiliary device for filter exchange may include a block plate having a width to be inserted through a filter frame extended downwardly toward the inside of a production line and equipped with a filter thereon; a support for supporting the bottom of the block plate and facing with the inside wall of the filter frame keeping a constant distance between them; and a tube having an air passage and installed to closely adhere to the filter frame along the circumference of the support for sealing. Adjustable seal inserts (such as corner-shaped inserts) may be provided for auxiliary or additional sealing effect, for example, at corners of a filter frame. A pressure indicator may also be provided for monitoring correct inflation of the tube.