Air Filter Paper 14in x 4.25in

The Air Filter Paper 14in x 4.25in (OTR R10401) is the replacement filtration element that keeps your engine breathing clean, unrestricted air under all operating conditions. Whether you're running a stock daily driver or a heavily modified engine, a quality air filter element is non-negotiable for protecting internal components from abrasive contaminants. This OTR Filters product delivers the depth and surface area needed for extended service intervals while maintaining proper airflow to the intake system.

OTR's filter paper construction uses a premium pleated design that maximizes dirt-holding capacity without creating excessive intake restriction. The 14-inch by 4.25-inch dimensions are engineered to fit standard oval or rectangular intake housings common across domestic and import platforms, providing reliable particulate capture across the full spectrum of driving scenarios—from highway cruising to full-throttle acceleration runs. The pleated geometry increases effective filtering surface area, allowing the element to trap fine dust, pollen, and debris while maintaining low pressure drop across the intake manifold, critical for preserving fuel economy and throttle response.

Mechanics and enthusiasts choose OTR filter elements for both stock restorations and performance builds because the consistent quality ensures OEM-equivalent or superior filtration without compromising airflow characteristics. The 14in x 4.25in size accommodates applications requiring flat or slightly curved filter housings, making it ideal for engine bay space constraints on modern platforms. Installation is straightforward—simply slide the element into your existing air box assembly, verify proper seating against the housing gasket, and secure the cover clamps to ensure no unfiltered air bypasses the element during engine operation. For high-mileage vehicles or those operating in dusty environments, checking this filter element every 12,000–15,000 miles and replacing it annually or as needed maintains peak intake efficiency and engine protection.