In Home - Whole House Central Vac System, Pure cyclonic cleaning action is an impressive alternative to filtering dirt and like most great ideas, it's simple. Vacu-Maid's pure cyclonic system allows large heavy particles to fall into a dirt canister, separate of the main power unit. Small particles are exhausted outside, with no detours or stopping points. This means no traditional filters to clog or clean. it also means virtually 100% sustained cleaning power, because without the restriction of a dirty cloth, paper, or foam filter, you get more consistent cleaning power at the end of the hose. Result? A cleaner house with longer carpet life and less professional cleaning.