Straying a little off topic, can the Davis air sensors become clogged? I ask because i am thinking about getting one, perhaps next year now but i have a unique homemade shield for my old OS temp/hum sensor, this has a fan at the bottom and i used an old OS rain gauge debris screen (its a fine mesh) to slip over the fan just to protect it some. I have to clean off that screen at least twice a year, is there a filter of sorts in place for the davis air quality sensor? I am thinking not as this would defeat its purpose?