Date: 5/18/2008 5:51 pm EDT
For a small area (like around a single tile), a utility knife will take some effort but will work OK. The plastic tabs are tough and won't be ruined with a few scratches.
For a larger area, you might want to consider getting a dremel-type rotary tool with a 1/8th inch cutting bit.
Both the utility knife and the dremel tool can cut the tabs, but you'll generall know when your hitting the plastic, so just ease-up at that point.
If you have more specific technical questions, please don't hesitate to call and someone at Avaire can assist you. 402-505-7627 weekdays 8-5 central time. Or you can try "Super Joe" at 402-709-8432 anytime between 8 AM and 9 PM central time 7 days a week - that's Joe's cell phone so please don't call him in the middle of the night.....