Air Filters

Find the correct replacement air filter by OEM part number, engine manufacturer, equipment model, filter type, shape, or dimensions. Mow Town USA carries paper air filters, foam air filters, pre-filters, safety elements, panel filters, and combination filter assemblies for lawn mowers, zero-turn mowers, lawn tractors, snowblowers, chainsaws, generators, pressure washers, and other outdoor power equipment.

The most reliable way to select an air filter is to match the original equipment manufacturer number printed on the old filter or listed in the engine or equipment parts manual. When an OEM number is unavailable, verify the engine model, filter dimensions, shape, sealing surfaces, and whether the application requires a separate pre-filter or safety element.

How to Find the Correct Air Filter

• Equipment manufacturer and model — locate the model tag on the frame, deck, housing, or equipment body.
• Engine manufacturer and model — many air filters are selected by engine model rather than mower brand.
• OEM part number — check the old filter, owner’s manual, engine manual, or illustrated parts list.
• Filter type — identify whether the engine uses a paper element, foam filter, pre-filter, safety element, panel filter, or combination assembly.
• Shape and dimensions — compare length, width, height, outside diameter, inside diameter, and mounting or sealing features.
• Filter housing — verify that the replacement fits the air-cleaner cover, base, clips, and gasket surfaces.

Important: Equipment from the same brand can use different engines and air filters depending on model year, horsepower, serial range, and original engine configuration. Match the OEM number and complete engine model whenever possible.

Types of Outdoor Power Equipment Air Filters

Paper Air Filters

Pleated paper elements trap fine dust and debris while allowing the engine to receive the airflow needed for proper combustion. Paper elements should normally be replaced when heavily soiled, damaged, oil-soaked, or restricted.

Foam Air Filters

Foam filters are common on small engines and handheld equipment. Some are washable and reusable when the equipment manufacturer permits cleaning and re-oiling. Replace foam that is torn, hardened, crumbling, distorted, or no longer seals correctly.

Foam Pre-Filters

A pre-filter fits around or ahead of the primary element and captures larger debris before it reaches the paper filter. Replacing or servicing the pre-filter can help extend the primary filter’s service life.

Combination Filters

Combination assemblies use paper and foam filtration together. Confirm whether the replacement includes both components or whether the pre-filter must be ordered separately.

Safety Filter Elements

Some commercial and heavy-duty air-cleaner systems use an inner safety element behind the main filter. The safety element helps protect the engine while the primary element is removed or if the main filter is damaged.

Why a Clean Air Filter Matters

A restricted or damaged air filter can reduce airflow, make the engine difficult to start, lower power, increase fuel consumption, cause rich running, and allow abrasive dirt into the engine. Proper filtration helps protect cylinders, pistons, rings, valves, and other internal engine components.

Frequently Asked Questions About Air Filters

How often should I replace my equipment air filter?

Follow the equipment or engine manufacturer’s service schedule and inspect the filter more often in dusty, dry, or high-debris conditions.

Can I clean and reuse a paper air filter?

Paper elements are generally replaced rather than washed. Water, solvents, compressed air, and aggressive cleaning can damage the filter media. Follow the manufacturer’s instructions for the specific engine.

Can I wash a foam air filter?

Many foam filters can be cleaned and reused, but the approved cleaning and oiling procedure varies. Replace foam that is damaged, deteriorated, or unable to seal properly.

What is the difference between a pre-filter and the main filter?

The pre-filter captures larger debris and helps protect the primary filter. The main filter provides the finer filtration required to protect the engine.

Why does my engine run better with the air filter removed?

That can indicate a severely restricted filter or another fuel-and-air problem. Do not operate the equipment without the correct filter installed because unfiltered dirt can quickly damage the engine.

Can I choose an air filter using dimensions alone?

Dimensions are useful when the OEM number is unavailable, but filters with similar measurements can have different sealing surfaces, media, shapes, or airflow characteristics. Confirm the engine model and OEM number whenever possible.

Does the mower brand determine the air filter?

Not always. Many mower manufacturers use engines supplied by Briggs & Stratton, Kohler, Kawasaki, Honda, or other engine makers. The engine model is often the best identifier.

Before servicing the air-cleaner system, shut off the engine, remove the key when applicable, allow hot parts to cool, and follow the equipment manufacturer’s maintenance instructions.