Aller-Guard 100® resists and helps to kill allergy-aggravating microparticles of pollen, fungi, mold, mildew, dust, dirt and bacteria and Aller-Guard 100® outperforms all other pile weather-stripping systems. It also resists odors and gases such as carbon monoxide and it creates barriers that inhibit dust and dirt particles from entering in the first place. This mold protection is built into every Pace manufactured window, and its protection is tested to last as long as your windows do.