The Honeywell Enviracaire Replacement Charcoal Prefilter Model 32001 is a high-quality unit designed to improve indoor air quality. Made in the United States, this prefilter is a single pack of one unit that effectively captures airborne particles and odor-causing agents. Perfect for use with Honeywell air purifiers, this charcoal prefilter ensures cleaner and fresher air for a healthier living environment.