FilterTime RV air filter was designed to replace the standard filter with a high-quality American Made Allergen air filter with great airflow and great filtration. FilterTime's RV air filter is designed to improve the overall air quality in your RV by capturing the small particles in the air. Filtering these particles with tackified polyester fibers before they enter your RV's air conditioner and recirculate throughout the RV is the key to improving the in-RV air quality. FilterTime uses all American Made materials. From your home to your RV, FilterTime helps clean the air you breathe.