This kit includes: One (1) RadonAway RP145 Fan, (2) rubber flex couplings (choose size and color to fit your system), (1) U-tube manometer to easily see that your fan is working, and (5) System labels to make your system compliant with radon mitigation standards. This fan can handle a wide range of situations. It is designed to move large quantities of air with drain tile systems or gravel but also able to produce a maximum of 2.1WC for tighter sub soils. If you can do 2 suction points with tight soils this fan will provide good results with minimal energy usage. Fan stats: Energy efficient at only 37-71 watts, Super quiet operation, ELT Listed - for indoor and outdoor use, Meets all electrical codes, For commercial and residential installations, Thermally protected motor, 4" inlet and outlet, 5 year limited warranty Note: Utility cords need to be purchased separately. The RP145 has 4" openings thus requiring either 4"x4" or 3"x4" rubber couplings for mounting. When in doubt 4" pipe is recommended for the RP145. Varmint guards are a must to protect your fans warranty (sold separately).