Based on this product's specifications, here are some alternatives and similar models
Industrial vacuum cleaner GEKO CG81093B — bag filter for ash vacuum, 285 mm
Summary description:
Replacement bag filter for GEKO industrial ash vacuum model CG81093B with a 285 mm diameter fitting. Designed for collecting ash and fine dust in industrial or workshop environments, the filter fits the vacuum inlet specified by the model and supports dry vacuuming of cold ash and particulate debris. Suitable for maintenance and spare-part use.