811 |
one-way no damper |
811MS |
one-way with multi-shutter damper |
811OB |
one-way with opposed blade damper |
812 |
two-way no damper |
812MS |
two-way with multi-shutter damper |
812OB |
two-way with opposed blade damper |
812C |
two-way corner no damper |
812CMS |
two-way corner with multi-shutter damper |
812COB |
two-way corner with opposed blade damper |
813 |
three-way no damper |
813MS |
three-way with multi-shutter damper |
813OB |
three-way with opposed blade damper |
814 |
four-way no damper |
814MS |
four-way with multi-shutter damper |
814OB |
four-way with opposed blade damper |