Liaoning Jiefeier Air Purification Equipment Co.,Ltd

After-sales service warranty

Dear client!

Thank you for choosing our products and services! We deeply understand that high-quality products are inextricably linked with excellent after-sales service, which serves as its reliable support. Therefore, we hereby guarantee to provide comprehensive and highly efficient after-sales service to ensure that your user experience exceeds your expectations. Below are the detailed guarantees of our after-sales service:

Warranty period

We provide a warranty period for the products you purchase. During this period, if any defects occur that are not related to user actions, we will repair or replace the product free of charge. The warranty period is calculated from the date of delivery of the product to the client.

Rapid response mechanism

We have set up a 24/7 technical hotline to ensure a quick response to any problems you may have at any time. Upon receipt of your service request, we will provide a preliminary response within 2 hours of notification and arrange a solution as quickly as possible.

On-site repair

For products that require on-site repair, we provide a nationwide on-site service. Once the need for repairs is confirmed, we will promptly dispatch qualified technicians with the necessary tools and spare parts directly to your specified location to carry out the work to minimize the impact on your operations.

Guaranteed availability of spare parts

We maintain an adequate stock of spare parts for all of our products to meet your replacement or upgrade needs. For discontinued or refurbished parts, we will make every effort to find alternative solutions or provide reasonable options to ensure continued and stable operation of your equipment.

Lifetime Service Commitment

We solemnly pledge that even after the warranty period has expired, we will continue to provide paid but reasonable repair and service services to ensure long-term and stable operation of your equipment. We undertake not to refuse service due to the expiration of the warranty period, ensuring the long-term safety of your investment.

Technical support and consultation

We have a professional technical support team ready to answer any questions you may have regarding the use of our products at any time. Whether it's describing product functions or troubleshooting problems, we will provide detailed and patient explanations. You can contact us by phone, email or other available means.

Satisfaction survey

We value the opinion and feedback of every client. After completing the service, we will conduct a satisfaction survey over the phone to find out your objective assessment of our work and, based on it, to constantly improve the quality of the services provided.

Summary

Thank you again for your trust and support! We will relentlessly strive for excellence to reciprocate your affection with high-quality after-sales service and create a wonderful future together!

Frequently Asked Questions

How do you determine which pre-filter to use? What is the difference between replaceable media, metal mesh and pleated filters?

• Replacement filter: first choice for conventional central air conditioners and fresh air systems. Low operating costs, you can only change the filter material without replacing the frame. Suitable for general office and commercial premises.

• Metal mesh filter: first choice for oily, high dust, outdoor installations with direct exposure to the environment, and in workshops with high temperatures and humidity. Resistant to acids and alkalis, allows repeated water washing, service life is more than 5 times longer than the service life of nylon mesh.

• Pleated filter: used in situations where installation space is limited, but where high air flow and low aerodynamic resistance are required. The pleated design provides a larger filtration area and lower resistance, suitable for compact installations.

Which high-efficiency filter should you choose - side gel seal, top gel seal, or blade seal?

• With side/top gel seal: For cleanrooms, operating rooms, pharmaceutical shops and other applications with extremely high zero leakage requirements. Sealing with a gel sealant of the “fruit jelly” type, no stagnant zones to prevent air leaks, 100% ability to control the tightness.

• With knife seal: end version for FFU, laminar ceilings and laminar air supply systems. Knife seal design combined with rubber sealing gasket ensures easy installation and stable sealing, suitable for modular cleaning units.

Which application scenarios correspond to filtration efficiency classes G3/G4/H13/H14?

• G3/G4 (Coarse): Used as inlet pre-filters to protect higher efficiency filters, used on outdoor air intakes in ventilation systems and in air conditioner returns.

• H13: General cleanrooms, laboratories, food production - scenarios with average air cleanliness requirements.

• H14: Hospital operating theatres, pharmaceutical manufacturing, electronic microchip manufacturing facilities are key areas with high cleanliness requirements.

What do the start and end resistances of a high efficiency filter mean? When should you replace?

• Initial resistance: resistance of the new filter at rated air flow. The lower the resistance, the lower the fan's power consumption.

• Final resistance: critical resistance value at which the filter becomes saturated with dust and requires replacement. For high-efficiency filters, the recommended final resistance is 450–600 Pa, for coarse filters - 250 Pa.

• Replacement criterion: when the final resistance is reached or it is impossible to ensure the required air purity, the filter must be replaced in a timely manner.

Are high efficiency filters leak tested before leaving the factory?

Is pre-treatment of the fruit jelly gel seal required when installing a high efficiency gel seal filter?

How to maintain coarse filters with a metal mesh and replaceable filter material? How often should they be washed or replaced?

• Metal mesh filter: can be removed and washed with high pressure water or neutral detergent, dried and reused. Typically, flushing is carried out every 3-6 months. In case of heavy contamination, the interval can be reduced to 1–2 months.

• Filter with replaceable filter material: when the filter material becomes dirty and the aerodynamic resistance increases, the material is replaced and the frame is reused. Typically replacement is done every 1–3 months. In conditions of heavy pollution at the outdoor air intake, it is recommended to check and replace monthly.

• Pleated filter and disposable coarse filter: when dirty, the entire filter is replaced, no washing required.

Can the high efficiency filter be washed and reused?

Can filters be made to size on site?

What is the warranty period for filters? How are issues resolved when quality problems arise?