The FAMCO DM Damper Motor has a few variations available to fit specific needs. Choose 24 volt or 120 volt. An end switch or motor assembly is optional. If you are choosing 24V, the FAMCO DM Damper Motor is available in either 1 RPM or 1/2 RPM. For the 120V, it is available only at 1RPM. If you have any questions about the FAMCO DM Damper Motor and the options available, please refer to the FAQs above or feel free to contact us by phone or email.