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The main thing making a pollen box function properly is the size and micron of the screen used. Over the years our screen size has evolved into what we think is the perfect size. We use a 83 l.p.i. 203 micron silk screen. This along with other information is hand written in every one of our boxes.
The size of the screen is measured in lines per inch ,other wise known as the L.P.I. What it is, is the number of individual strands per inch of screen material. The other measurement is referred to as the micron of the screen. One micron also known as a micrometer is one millionth of a meter or one thousandth of a millimeter .001mm or .000039 of an inch. Microns are measurements used to describe the size of a particle allowed to pass through a particular screen. The chart below will give you a good visual of how small a micron actually is.
Human Hair
50-70 microns
Fine Beach Sand
90 microns
Dust,Mold.Etc.
10 microns
Combustion Particles
2.5 microns
