4 Cubic Feet
The 4 cubic feet capacity Duel line of washers is available in white, red or silver, and these are front-loading washers. The WFW9250WL model comes with the TumbleFresh option, which keeps your clothes from wrinkling, and it features Smooth Spin technology, which keeps your washer from vibrating and making noise. Its dimensions are 27 by 30 1/2 by 36 inches, and it has a stainless steel drum. It has 4 temperature and 12 wash cycles.
4.1 Cubic Feet
As of 2011, Whirlpool only offers one 4.1 cubic feet capacity model (model WFW9400SZ) in the Duet series, and it is available only in white. It has a stainless steel drum, and comes with 14 washing cycles and 5 temperature settings. It is 27 by 31 1/2 by 38 inches high, and has an automatic door lock and a child lock. It features the 6th Sense Technology, which determines how much water you need to clean your clothes.
4.4 Cubic Feet
The 4.4 cubic feet capacity models are available in silver, red or white, and they are front-loading washers. A representative example of this washer is the WFW9550WW, which comes with the 6th Sense Technology and the Quiet Wash Plus Noise Reduction feature, which keeps noise levels to a minimum. It also comes with the control lockout option, which keeps other people from changing the cycle or temperature setting. Its dimensions are 27 by 32 9/16 by 38 inches, and it has a stainless steel drum. It has 4 temperature settings and 12 wash cycles.
4.5 Cubic Feet
The 4.5 cubic feet capacity models are front-loading washers, and they are available in silver, red or white. As a representative example, the 4.5 cubic feet WFW9750WW model has a stainless steel drum and 14 automatic wash cycles. It features the Smooth Spin technology, which keeps the drum from producing noise, and the 6th Sense Technology. It also has sanitary cycles to kill bacteria. Its dimensions are 27 by 32 9/16 by 38 inches.
5.0 Cubic Feet
The 5.0 cubic feet capacity models are available in silver, white or cranberry. The WFW97HEXL model features the 6th Sense and Care Control Temperature Management technologies, and the latter technology helps ensure that your detergent dissolves in your water. This model is 27 by 31 1/2 by 38 inches, and has 26 wash cycles and 6 temperature settings.