Plastic construction: Crafted from robust plastic, this air filter is designed for longevity and wear resistance, providing reliable performance for your heating system. Optimized diameter: 24 mm diameter (approximately 0.95 in), designed to fit diesel heaters that have 25 mm air intake pipes, promoting secure fit and efficient airflow. Enhanced noise reduction: Upgraded design significantly minimizes operating noise, creating a quieter and more comfortable environment while the parking heater runs. Easy installation: Quick, convenient installation without the need for professional assistance, getting you back to comfort quickly. Use scenarios: In a motorhome or camper van during cold weather, it supports reliable heater operation with lower noise for a more pleasant interior. In a delivery or service vehicle, it helps maintain consistent airflow and reduces cabin noise, improving comfort on long trips. On a boat with a diesel heating system, it contributes to steady warmth and a quieter onboard experience, whether at dock or underway.