The Vent-Free Fan Convectors are available in 10,000- and 24,000-Btu models and operate without vents or ductwork, making them suitable for room additions, basements, or sunrooms. The convectors were reintroduced as a direct result of customer demand for supplemental residential heating solutions. Includes a built-in oxygen depletion sensor, control panel lock, and a cool-touch cabinet. Three-year parts warranty and built-in self-diagnostic codes allow for quick troubleshooting.