Intertherm Damper M1 Series. Follow manufacturer recommendations for proper fit information. Made with quality materials for optimal performance and reliability. Features of Intertherm 901996B Damper M1 Series Replacement damper (self-contained A/C) Designed using galvanized steel with a polyester urethane coat finish Follow manufacturer recommendations for proper fit and installation information Made with quality/durable materials Package Contents: Intertherm 901996B Damper M1 Series Intertherm 901996B: Damper M1 Series