Stealth Air Box Replacement Pre-Filters – Keep Your Filtration System Running Smoothly Maintain peak performance and extend the life of your Air Box carbon filter with these high-quality replacement pre-filters. Designed to trap larger dust and airborne particles before they reach the main carbon filter, these pre-filters ensure optimal airflow and filtration efficiency. Available Sizes: Air Box 3 Models: Measures 12" x 12" x 1" Air Box 4 Model: Measures 12" x 15" x 1" Air Box 4 Plus Model: Measures 19" x 16" x 1" Why Replace Your Pre-Filter?Over time, dust and debris can clog your pre-filter, reducing airflow and overall system performance. Replacing your pre-filter every 3 months helps keep your air filtration system running efficiently and prolongs the life of your main carbon filter. Features: Designed for perfect fit with Air Box carbon filter models Helps maintain high airflow and filtration efficiency Easy to replace – no tools required Extends the life of your primary carbon filter Made in the USA Whether you’re running a residential grow room or a commercial facility, keeping your air clean starts with a fresh pre-filter. Choose the correct size for your Air Box model and breathe easy knowing your environment is protected.