Kit includes: one RP265 radon fan, two 4x6 rubber flex couplings, one u-tube dynameter, and five system labels. The RP265 is a very high flow fan rated at 95-152 watts. This fan is usually used with large drain tile systems and gravel only. It also has the ability to suck hard with a maximum pressure of 2.5"WC. Great for basements larger than 2500 sq/ft. A good choice for higher radon levels in large finished basements where crack filling isn't possible. Or where multiple suction points may be needed with possible high air flow rates.