Ceiling Exhaust Fan Model SP-A Factory-Installed Ceiling Radiation Damper Model CRD-310WT No assembly required. It's ready to install. Specify two, top-performing Greenheck products in one step. Greenheck combines ceiling exhaust fans and ceiling radiation dampers at the factory - creating one easy-to-install unit. This fan and damper unit is UL approved to be used in 20 different wood truss floor/ceiling and roof/ceiling assemblies. It is also UL555C approved to be used in noncombustible designs. Ideal for multifamily buildings, condos, hotels, hospitals and schools. The combination ceiling exhaust fan and ceiling radiation damper unit can be specified in Greenheck's Computer Aided Product Selection program (CAPS®). Learn more at greenheck.com | 715.359.6171 © 2019 Greenheck Fans | Energy Recovery | Packaged Ventilation | Make-up Air | Lab Exhaust | Dampers | Louvers | Coils Available on select sizes and configurations Tested and classified in accordance with UL555C. UL/cUL 507http://www.greenheck.com