Width 21 In

Shaft Height: 10"

the unit requires a rough opening that measures 15-1/2 inches in width by 18-1/4 inches in height

The mounting hardware for the shelf is included with the unit

Marathon Motors 2 HP, General Purpose Motor, Capacitor-Start/Run, 3450 Nameplate RPM, 115/230 Voltage, 56 Frame - 056B34D11011 Lever Roll Paper Towel Dispensers Width 21 InKeep pumps moving with this general purpose motor. It features an open dripproof motor enclosure design, which is engineered to permit good airflow while resisting the ingress of dripping water. The vents are angled to prevent water from entering the enclosure from above. The motor's shaft also turns a cooling fan to help pull air through the motor. For durability and long service life, the motor also features a rolled steel frame.