Hypertherm's 228570 air filtration kit comes with a steel guard to help protect against accidental damage. The air filter comes ready to install with a 1-micron filter & attaches easily to the power supply using the pre-existing mounting holes. It features a top-side indicator that turns red when the filter element needs to be replaced.
This kit comes with a steel guard that only fits the Powermax 65 and 85. The proper kit for Powermax 105 and 125 units would be the 228890 kit.