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Air Function Control Options
| Air With Vanes (Supply/Return Option) | Dampers (Extract Option) |
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| Designation | Description | Air Function |
| -V | Vanes: Also referred to as air pattern blades or directional air vanes. | Vanes work with supply/return air (-A or -C). Vanes open outward, from 0 to 90 degrees, like a door swinging open. To control air flow, adjust opening as desired or close completely. When used on a -C fixture, vanes operate independently of dampers. |
| -D | Dampers: Also referred to as heat removal dampers or control dampers. | Dampers work with extract air (-H, -C). Dampers slide open, like a window. To control air flow, adjust opening as desired or close entirely. When used on a -C fixture, dampers are controlled independently of vanes. |
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