289 - Model 289 - 2 Hr. Rated Ceiling Radiation Damper. Rectangular galvanized steel construction with two uninsulated blades.
291 - Model 291 - 2 Hr. Rated Ceiling Radiation Damper. Rectangular galvanized steel construction with two insulated blades.
293 - Model 293 - 2 Hr. Rated Ceiling Radiation Damper. Rectangular galvanized steel construction with four insulated blades.
295 - Model 295 - 2 Hr. Rated Ceiling Radiation Damper. Round galvanized steel construction with two uninsulated blades.
297 - Model 297 - 2 Hr. Rated Ceiling Radiation Damper. Round galvanized steel construction with two insulated blades.
CERB - Thermal Blankets Installation Instructions