PVC breathers on valve covers

Im not a fan if the breather into the air cleaner ( but it may be cleaner in your garage air) as the air cleaner environment is almost always a slight vacuum. You want to draw free fresh air into the breather via the vacuum of the pcv across the lifter valley. The cotton/gauze style breathers are washeable and offer good filtration then burn it. It rids motor of acidic byproducts and water vapor, both cause sludge in oil.