The tightly woven synthetic HEPA fibers in this filter will help prevent mold, bacteria, pollen, insects and plant pests from entering your growroom or greenhouse. The HEPA fibers block out most airborne particles down to .3 microns in diameter. That is 300 times smaller than the diameter of a human hair. This is a serious insurance filter, without it you are leaving your grow room susceptible to the elements. The filter is also washable for extended efficiency. 

Installation:

Attach your Organic Air HEPA filter to your fan or blower by sliding the rubber collar over the inlet or outlet side. Secure the filter by using the clamp provided, tighten clamp with screwdriver. Remove and wash filter when needed with water hose. Filter should be replaced every year under moderate use. Keeping the filter clean will ensure efficiency and longevity. The cleaner the area the longer this filter will last.