Overview
The document provides technical specifications for the FTR series of rigid filter bags, which are high-efficiency filters used for micro dust filtering in various air-treatment installations such as dwelling houses, laboratories, hospitals, and data processing stations. These filters can also serve as prefilters for absolute filters.

Technical Characteristics

• Filtration classes range from F6 to F9.
• Available configurations include two, three, or four bags.
• Airflow capacity ranges from 1300 m³/h to 4250 m³/h.
• Constructed from folded glass fiber paper with a plastic containment frame.
• Thermoplastic separator wire and polyurethane sealing.
• Maximum operating temperature is +70°C.

FTR Filters with Four Bags
These filters are available in various models with different dimensions, airflow capacities, and efficiencies. The efficiency ranges from 60% to over 95%, with pressure drops between 60 Pa and 450 Pa.

FTRE Filters with Three Bags
Similar to the four-bag models, these filters offer a range of efficiencies and airflow capacities. They are slightly smaller in surface area compared to the four-bag models.

FTRD Filters with Two Bags
These models are designed for lower airflow capacities and are available in similar efficiency classes as the other configurations. They are suitable for applications requiring less filtration surface area.

Conclusion
The FTR series offers a versatile range of rigid filter bags suitable for various air filtration needs, with options to accommodate different efficiency requirements and installation constraints.