It is recommended that homes larger than 5000 square foot might need a power unit stronger than 20 AMPS 110 volt. Multiple units are only necessary when more than one user will be operating it simultaneously. New SuperValves or ElectraValves not only contain the 24 volt activation switch but also 110 volts for the operation of an electric power brush. Have an electrician wire them into a nearby electric outlet. Check your local building codes regarding the necessity of steel pipe to penetrate the firewall if the power unit is located in the garage.
Most manufacturers now carry steel pipe and fittings.
Temporary plaster guards will protect the interior of the pipe while the construction is in progress and inlet valve extensions can make your life easier if the wall ends up thicker than expected when you go to install finish plates on the wall. Check if your manufacturer recommends venting the exhaust and make sure it is not located in an area which will cause problems. Many systems do not need venting if they have an adequate filtration system. This may reduce wear on the motors due to heat and dust build up. Employ closets, soffits, return air ducts, pantries and any other hidden spaces.