Pre-Cut Carbon Pre-Filters efficiently deodorize the air and trap larger particles such as dust, lint, fibers and pet fur. Enjoy the many comforts associated with surrounding yourself with a pristine breathing experience all year round. Pre Filters are extremely efficient in capturing particular household gases such as ammonia and the gases from cleaning products, paint and furnishing. Honeywell Pre-Filters are made with activated carbon to deodorize the air and reduce odors involving cooking, smoke, pets and the bathroom. Honeywell Pre-Cut Carbon Pre-Filters are designed for medium room HEPA air purifiers.