25 Years of Filtration Engineering
The King Filter is the international brand of Luoyang Duoweisi Environmental Protection Technology — an industrial filter-bag manufacturer trusted by cement, power, and steel plants across 20+ countries.
- Founded
- 2001
- Manufacturing Facility
- 36,000 m²
- Annual Capacity (1M Bags)
- 3M m²
- Patents Held
- 50+
Built in Luoyang, specified worldwide.
Founded in 2001, Luoyang Duoweisi has spent more than two decades doing one thing well: manufacturing high-temperature, chemical-resistant filter media for the world's most demanding dust-collection systems.
We are a manufacturer, not a trader. Six production lines under one 36,000 m² roof handle needling, calendering, heat-setting, and PTFE membrane lamination — so quality is controlled from raw fiber to finished bag.
Today we export directly to plants in Saudi Arabia, India, Malaysia, and Vietnam, and we're expanding engineer-led technical support across Southeast Asia and the Middle East.
Engineering You Can Walk Through
From raw fiber inspection to automated sewing — operated by technicians who understand bag life.
Integrated Manufacturing
Every step from fiber to finished bag happens in-house, on six lines — no outsourced quality gaps.
Lab-Tested Quality
Every batch checked for tensile strength, air permeability, weight uniformity, and thermal shrinkage.
Honest Engineering
We recommend the media your flue gas actually needs — even when a cheaper grade costs us margin.
Engineer-Led Support
Talk directly to technical specialists who understand baghouse design, not a call-center script.
Need a Custom Solution for Your Baghouse?
Use our deterministic 6-step engineering selector or connect directly with our technical team.