Broan MP140 is a multi-port in-line fan designed for continuous operation, supplying fresh air to the entire house. It features a powerful motor that can move up to 140 CFM of air, making it suitable for dwellings up to 2100 square feet. The MP140 comes with fresh air inlets and exhaust diffusers to control the flow of fresh air drawn through the house. It also has a built-in thermal insulation to minimize condensation in unconditioned spaces like attics. The MP140 is easy to install and can be mounted in a variety of locations, including the ceiling, joists, or rafters.