Breathe Fresh, Live Better! 🌱 Designed for allergy and asthma relief. Made from compound non-woven fabric. Tailored for Vacmaster VK811PH and VK1011SIWTHHEPA. Simple installation for hassle-free upkeep. Disposable pre-filter extends HEPA cartridge lifespan. 0.01 oz lightweight 1 pre-filter included 7.75 x 7.75 x 11.25 in The Vacmaster HEPA Cartridge Pre-Filter (VKPF001) is an essential accessory for your Vacmaster vacuum, specifically designed to enhance air quality by trapping fine particles that trigger allergies and asthma. This lightweight, easy-to-install pre-filter prolongs the life of your HEPA cartridge, ensuring a cleaner, healthier environment.