Who we are
Longday AG is a specialist in advanced air filtration solutions for demanding environments.
We design and manufacture high-efficiency filters, air cleaner assemblies, and filter elements for OEMs and distributors worldwide, tailored to specific technical and performance requirements.
Our core expertise includes engine and cabin air filtration for combustion engines, compressors, and mobile machinery, complemented by replacement filters for fuel, oil, hydraulic, and aviation systems — offering a complete aftermarket program from one trusted source.
We serve diverse sectors such as on-road and off-road vehicles, mining, agriculture, construction, marine, railway, industrial, and indoor air purification — powered by our DustRanger™ series, a modular system for protective cabin ventilation and indoor air quality solutions.
All Longday filters comply with leading international standards — ISO 16890, EN 1822, EN 15695, and ISO 5011 — ensuring clean air, safe operations, and reliable performance across industries.
Because clean air matters.
About Us
APPLICATION EXAMPLES
Longday air filters are designed to guarantee safe and clean air for human health and machinery within various main business sectors!
Truck
Bus
Utility vehicles
Engines
Vehicle HVAC
Power generators
Road sweepers
Ozone disinfection devices
Powertrain
Battery package
Fire truck
Driver cabins
Agricultural machines
Mining machines
Forklifts
Cranes
Construction machines
Vehicle HVAC
Lawnmowers
Power generators
Wood harvesters
Wood choppers
Sprayer
Battery package
Ozone disinfection devices
Compressors
Engines
Powertrain
Driver cabins
Engines
Turbines
Compressors
Pumps
HVAC
Power generators
Ozone disinfection devices
Battery package
Ventilation
Pumps
Turbines
Compressors
Plastic machineries
Battery package
Vacuum cleaners
Ventilation
Heating and Cooling
Wood stoves
Painting systems
Sandblasting machines
Smoking cabins
Gas condensing boilers
Ozone disinfection devices
Power generators
Ventilation systems
Building Air Conditioning
Air purification
Vacuum cleaners
Wood stoves
Gas condensing boilers
Smoking cabins
Ozone disinfection devices
HVAC systems
Engines
Compressors
Powertrain
Ventilation
Ozone disinfection devices
Power generators
Our global network
