Features Filter dimensions4 Pack Filter for AlorAir air filter system13.2 x 9.5 x 1.5 inFiltration gradeHigh efficiency MERV-11 filter captures 90% of 3-10um particles and 85% of 1um particles. Quickly and safely filters airborne particles to protect internal components from clogging while improving your work environment.Easy to installSimply follow the arrow signs to determine the correct airflow direction and place the new filter to complete the entire replacement process.Long filter lifeRecommended to replace the filter every 2-4 months to keep your MERV-11 filter running at peak performance.CompatibilitySpecifically designed for Purecare 1350 IG/ Purecare 1350 Air Filtration System.Warm Tips In order to obtain the best results, please replace the filter every 60 to 120 days. (In case of frequent use in the workshop, replace the filter according to the use). If you have any questions, you can call us directly, ready to assist you.