Find answers to common questions about LJF air filters, customization, samples and ordering.
Frequently Asked Questions
LJF is an air filter manufacturer based in Guangzhou, China. Our in-house capabilities cover filter media processing, frame assembly, filter manufacturing and quality inspection, supporting consistent quality and flexible customization.
We supply spray booth filters, pocket filters, panel filters, HEPA filters and air filter media. Our products serve applications including automotive refinishing, industrial painting, HVAC systems, air handling units and cleanrooms.
Send us your application, filter dimensions, required filtration efficiency and operating airflow, if available. Photos or specifications of your existing filter are also helpful. Our team will review your requirements and recommend a suitable option.
Yes. We supply ceiling intake filters and paint arrestor media for spray booth exhaust filtration. Please share your booth type, filter location, dimensions and coating application so we can help match the appropriate filter media.
Yes. We offer custom dimensions, filter media, frame materials and configurations, subject to the product and application. Send us your drawings, specifications or a reference sample so we can assess production requirements.
Yes. We support OEM and ODM projects, including product customization, private labeling and packaging requirements. Product specifications, branding details and packaging options are confirmed before production.
Our minimum order quantity starts from one piece. The applicable MOQ depends on the product, dimensions and customization requirements. Please contact us to confirm the MOQ for your order.
Yes. Samples are available for product evaluation. A sample fee applies and can be deducted from your order payment after an order is placed, subject to the agreed terms. Sample availability, shipping costs and preparation time will be confirmed before payment.
Please provide the product type, dimensions, quantity and delivery destination. For a more accurate quotation, include the required filtration efficiency, frame material, application and any labeling or packaging requirements. If specifications are unavailable, send clear photos of your existing filter and its label.
Production time depends on the product type, order quantity, material availability and customization requirements. We confirm the estimated lead time when preparing your quotation. Please let us know if you have a required delivery date.
Our quality control process includes checks on incoming materials, production and finished products. Depending on the product, inspections may cover dimensions, filter media condition, frame assembly, sealing and packaging. Any additional testing requirements should be agreed before production.
Please tell us which certificates, test reports or technical documents your project requires. We will confirm the documents available for the specific product and model before you order.
Yes. We supply overseas customers and can discuss shipping arrangements based on your destination, order volume and delivery requirements. Shipping costs, trade terms and the estimated transit time are confirmed with your quotation or order.
Replacement frequency depends on the filter type, operating hours, airflow and dust or paint loading. Follow your equipment manufacturer’s guidance and monitor pressure drop and filter condition. Share your operating conditions if you need help planning filter replacement.
Contact us with your order number, a description of the issue and clear photos or videos. For shipping damage, please also include photos of the packaging and shipping labels. Our team will review the information and work with you on an appropriate solution.
Send us your filter dimensions, application and quantity. Our team will help you select a suitable product and prepare a quotation.
Need the Right Air Filter for Your Application?
Send us your filter size, efficiency, quantity or application. Our team will recommend a suitable filtration solution.