The air filter is the engine's first line of defence against atmospheric contaminants. Its job is to capture dust particles, sand, pollen and soot before they reach the combustion chamber. In environments where construction or agricultural machinery operates, airborne dust concentrations can be dozens of times higher than on paved roads — making a properly functioning air filter essential for engine longevity.
At Filtry.org you will find panel, round, conical and safety-element air filter sets from HIFI Filter, SF Filter and PZL Sędziszów — manufacturers specialising in industrial and automotive filtration. Every filter can be looked up by OEM number or vehicle application.
In passenger vehicles every 15,000–30,000 km; in construction and agricultural machines every 250–500 engine hours or when the restriction indicator signals. In high-dust environments the interval may be cut in half.
The primary (outer) element captures most contaminants. The safety (inner) element protects the engine during primary filter changes and in case the outer element is damaged. Together they form a two-stage filtration system common in heavy-duty machinery.
Compressed-air cleaning is acceptable only for heavy-duty cellulose-media filters — and only a limited number of times. Panel filters with synthetic media should never be blown out, as it damages the non-woven structure and reduces filtration efficiency.
The quickest way is to search by OEM number or the filter manufacturer's part number. On Filtry.org you can also browse by vehicle make and model — the system will automatically display matching cross-references.