Welcome to the board but this section is for questions and suggestions about the forum.
Click the link above for the section you should post this query in.
Edit: Never mind. A Mod has kindly moved it for you
Preventing dust means cleaning the room/house. Regardless of how well sealed something is, dust will still collect on the outside of it if the room itself isn't regularly cleaned. Getting rid of carpets cuts down on dust a LOT. And change the air filter on your ventilation system regularly.
Don't underestimate the IKEA cabinets - or overestimate the amount of dust that will make it into the displays. I've got two kids and two dogs in this house, and plenty of glass faced IKEA cabinets with no dust issues. And this is in an office that I use every single day - and many times for things I shouldn't be doing here, like soldering, sewing and other things that aren't conducive to keeping the place very clean. Which is why I'm working on building a new shop space at the moment.