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Yes I have a kevlar fan on my Heritage II. After 5 yrs it hasn't developed the stress cracks the lexan fans did and eventually fail. I replaced the lexan fan twice due to stress cracks. Tolivac wants a trap for heavy objects before the fan. Hoover Conquests have them. they do minimize large items going thru the fan but not the total solution. I still dump out small gravel, ice melt and hands full of paper clips even with magnet bars on the machines out of the fan case and rubber duct tube leading to the top fill bag. Tip over a running machine and all that collected stuff goes in the fan any way. Kirby's are notorious for tipping over when the hose is attached and pulled by the hose. With the G Models this isn't as problemmatic due to the wider stance of the machine but still happens. As I said earlier it is just one more thing to try to teach someone to check that never happens. Commercially yes it helps. Domestic you then need a vacuum that doesn't pass dirt thru a moving fan. Very simple solution. Thats why many people keep an upright and a tank type vacuum to meet all thier cleaning needs. Just becouse a vacuum will suck up objects it wasn't designed to do. Doesn't mean it will with stand repeated abuse.