Characteristics: • The overpressure shutter fits directly onto the wall. • Several fittings for round and rectangular ducts. • Aperture by overpressure due to air flow. • Closed when the fan is at rest. • Construction in plastic material. • Recommended maximum speed of 12m/sec., for models 80, 90 and 100. • Models 56, 63, 71 and 80: are supplied in two parts. • Models 90 and 100: are supplied in three parts.
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