Representative testing of the Kirby G4 has shown that the suction power of the full head system is powerful enough to clean up after other vacuum cleaners have done their job. With the easy-to-use foot-controlled height adjustment, every carpeted surface can be set to the optimum range for full power. The proper height can be witnessed as the vacuum suction lifts the carpet as the vacuum passes over it, which is the secret to its deep cleaning ability. The HEPA filtration bags are easy to change and clean to dispose of. The Kirby vacuum bags themselves are designed to block out recirculation dust as well as dust mites, dander, microbes, and bacteria. Since recirculation air is blocked through the HEPA filter, dust does not return to the room. The Kirby cleaned carpet leaves behind Kirby cleaned air. The fan is made from Kevlar and is completely resistant to breakage. Users can accidentally vacuum up a coin and the fan will remain undamaged. Kirby attachments are also designed to withstand a significant amount of abuse. While they are not quite indestructible, they are built to resist cracking, breaking, and chipping under harsher than normal use circumstances.The Kirby G4 comes with an upgraded horse hair bristle brush bar to replace the less effective nylon based bristle brush bar. The horse hair bristle brush bar lifts dirt more effectively than nylon and is less likely to leave any scarring or marks if accidentally used on bare floors. The horse hair brush bar has been known to pick up as much as 25 percent more dust and dirt particles than nylon.The Kirby exclusive mini head pet tool is the ultimate tool for picking up pet hair and other hard to grab dirt. Sofas, car seats, and upholstered furniture can be thoroughly cleaned with the mini head pet tool. The mini head is designed to fit into small spaces while maintaining the original force of power. This little tool can be used on any soft surface including beds and mattresses, carpeted steps, and even in a pinch the winter coat.For floors the Kirby G4 comes with a clean head system designed for hardwood floors, tile, and linoleum. The powerful suction that gets carpeting deeply cleaned is filtered through an extra long 13-foot hose, a double extension wand, and a floor head that is gentle on bare floors but thorough on dirt. The low profile floor tool reaches easily under furniture including all the way under sofas and beds.