The Wolverine Cub is an economical, residential, low flow activated carbon filter. This filter is intended for use in residential applications. This might be on home roof vents and/or yard vents. The housing is made of sturdy schedule 30 pvc. It installs in minutes with nothing more than a 10mm wrench. Data/Cut Sheet Carbon Data Sheet Carbon MSDS Instructions When the filter arrives, the carbon will be in a separate bag with the top off the filter. You simply pour the carbon in the top, place the rain cap with perforated disc on the top of the filter, line up the bolts with the holes in the filter body and screw them in. The carbon can easily be changed by reversing that procedure. Most homeowners will find this filter will vary in lifespan based upon their situation. That said, most homeowners will find that they get 2-3 years out of the filter before having to replace the carbon. It is easy to set up and install the Cub on your roof vent. First, measure your vent pipe. Remember, you will need one filter for each vent pipe that you have. When you are measuring your vent pipe, use this handy chart to determine what size filter you need to purchase (the “nominal vent pipe size”). Outside Diameter (inches) Nominal Vent Pipe Size (inches) Filter Size Needed in DN* 1-7/8” outside diameter (47.625 mm) 1.5” 40 mm 2-5/16” outside diameter (58.7375 mm) 2” 50 mm 3-7/16” outside diameter (87.3125 mm) 3” 80 mm 4-7/16” outside diameter (174.625 mm) 4” 100 mm 6-7/8” outside diameter (174.625 mm) 6” 150 mm Carbon Bed Life and Contact Time Calculator In order to calculate the life estimate of this filter, you will