ABOUT US
Because clean air matters.
Longday AG is a Swiss company specializing in advanced air filtration technologies for demanding environments and industrial applications.
We design and engineer customized filtration systems that meet the highest international standards and the specific technical needs of OEMs and distributors worldwide.
As the exclusive international partner of Virgis Filter (Italy), we combine Swiss precision with Italian craftsmanship — delivering reliability, full traceability, and scalable production across industries.
With our dedicated manufacturing base in China, we produce a complete range of engine, cabin, hydraulic, fuel, and oil filters — uniting global efficiency with Swiss quality and ensuring availability wherever our customers operate.
Beyond these partnerships, Longday develops its own filtration technology — the DustRanger™ Series, a modular overpressure and air purification platform engineered to protect operators, equipment, and indoor environments.
It combines advanced ventilation, active pre-cleaning, and customizable HEPA + carbon filtration — providing clean air solutions for cabins, containerized systems, and industrial or indoor applications.
From concept to delivery, Longday stands for engineering expertise, custom manufacturing, and global logistics — ensuring every filter performs to specification, on time, every time.
Longday AG – delivering clean air where it matters most.
Why Longday
We are more than a supplier — we are a long-term partner dedicated to your success.
- High-efficiency filters tested to international standards
- Custom designs and tailored packaging
- Safety stock programs and reliable global logistics
- Engineering support from concept to delivery
- Direct factory or warehouse shipments
- Transparent partnerships built on trust
We continuously invest in new materials, technologies, and processes — helping our customers stay ahead in performance, quality, and sustainability.
Innovation & Quality
Every Longday filtration system is built on modularity, performance, and customization.
Our proprietary DustRanger™ Series ensures clean air in cabins, enclosures, containerized systems, and industrial environments – protecting people and equipment even under the most demanding conditions.
It reflects our unwavering commitment to clean air, safety, and product excellence.
Rigorous testing and validation ensure consistent performance:
ISO 5011, EN 15695, EN 16890, and more — verified internally and by FIATEC (Germany).
Certified Production
- Italy & China: 10+ million filters/year
- ISO 9001 and ISO 14001 certified facilities
- Clean-room production for high-grade filtration
Through innovation and precision engineering, Longday AG delivers reliable filtration solutions that protect people, machines, and environments — because clean air matters.