There is no air filter on my Ryobi c430 grass

I had a number of customers tell me that they bought this model at LOwes and had the same answer from them. I think its a planned failure on Ryobi's part. Their reply to me was that they dont need one because they work in a clean environment. I find this to be a stupid answer, I would recommend that you buy an airfilter for an older model that used the donut foam filter and slice it in half to fit in the housing without crushing it and imbeding the air flow, this will help tremendously. Good luck. MY advice from 44 years as a small engine engineer is to buy a name brand product from a company that stands behind them, and never sells them in a box..