The ELBD375I Automatic Intake Dual Combination aluminum louver combines a drainable blade louver and an intake backdraft damper in a nominal 9" frame depth. Louver blades are .081" thick extruded aluminum at approximately 4" c-c spacing. Backdraft blades are .025" thick formed aluminum with concealed blade linkage, synthetic bearings and non-metallic blade seals. It features:
- Approximately 40% Free Area.
- All aluminum construction for low maintenance and high resistance to corrosion.
- Operable blades that begin to open at approximately .03" w.g. pressure and are fully open at approximately .10" w.g. pressure.
- Maximum recommended intake free area velocity through louver: 550 fpm (168 m/min).