How do I keep my dedicated room & gear cleaner?

I HAVE A DEDICATED LISTENING ROOM WITH MBL 101E MK2 RADIALSTRAHLERS, B.A.T. VK600SE MONOBLOCKS, B.A.T. VK51SE PREAMP, LINN SONDEK LP12 T.T., AND A MAGNUM DYNALAB MD102 FM TUNER. I LIVE OUT IN THE COUNTRY WHERE THERE IS LOTS OF AGRICULTURE, AND IT'S DUSTY ALL THE TIME. WHILE I ENJOY OPENING UP WINDOWS AND SCREEN DOORS WHEN THE WEATHER IS NICE TO LET IN FRESH AIR, MY GEAR GETS REALLY DUSTY-FAST. I DON'T WANT TO HAVE TO COVER EVERYTHING UP ALL THE TIME AS I LEAVE MY SYSTEM ON FOR LONG HOURS, BOTH DAY AND NIGHT.
DOES ANYONE HAVE ANY SUGGESTIONS ABOUT USING SOME AIR FILTRATION STUFF? DOES TOO MUCH DUST BUILD-UP CAUSE ANY LONG TERM PROBLEMS WITH AUDIO GEAR AND/OR SPEAKERS?