I have a new Ferris 1500z, which has the canister air filter. This setup normally has a primary and secondary air filter, whereby the secondary air filter encompasses the smaller primary filter. But I noticed that mine only has 1 (the larger secondary filter). I thought that this was just a new design because the demo model that I tried also had only 1. But the parts manual shows 2. So it looks like they just forgot to put on the primary filter. For those who own a 1500z, did yours come with 2 filters?