Supply of three-stage filter box G4–F8–H13/H14 for an industrial facility in Zhejiang 

For one of the production facilities in Zhejiang province (China), it was necessary to organize a multi-stage supply air purification system. The customer’s goal was to protect process equipment from dust, ensure stable operation of the ventilation system and create safe conditions for personnel. Particular attention was paid to the accuracy of filter selection and the ease of their subsequent replacement.

The filter box is designed for sequential installation of three stages of cleaning in accordance with GOST R 56638 and EN 779/EN 1822:

1.The first stage is a frame panel coarse filter of class G4.​

Retains large particles, fibers and insects, reducing the load on subsequent stages.

2.Second stage - pocket fine filter class F8.​

Provides effective collection of fine dust, protecting fans and heat exchangers.

3.The third stage is a high-efficiency HEPA filter of class H13/H14, made in the FV form factor.​

Carries out final air purification from submicron particles, ensuring compliance with strict sanitary and technological requirements.

The housing is made with high tightness and is equipped with quick-release locks, allowing filters to be replaced without dismantling the entire section. The guides and seats are made with an accuracy of ±1 mm, which eliminates the leakage of untreated air. The design is adapted to Russian climatic and operational standards.

With 27 years of experience, ISO 9001/14001/45001 certified, TC Filter Group's factory has 30 production lines and an annual capacity of 5 million units. The presence of 19 patents for utility models confirms the company's engineering potential. We implement non-standard projects, including boxes with combined cleaning stages (G4–F8–H13/H14), strictly according to customer drawings.

To select three-stage filter boxes with specified purification classes (G4, F8, H13/H14), contact TC Filter engineers. We will provide aerodynamic calculations, drawings and technical support at all stages - from design to commissioning.