Opposed Blade Damper - OBD |
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Determine the sound level which results from the combined effects of several sound sources is not as difficult as it is confusing. |
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If the difference between NC levels of two units is 10db or more, the sound generated by the quieter unit will not affect the space NC. |
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TYPE OBD |
Opposed Blade Damper manufactured from extruded aluminium Blades. Blades are held in place by spring wire and star lock push on fix. The OBD blades are linked and lever or slot operated. OBD suits all standard grilles and diffusers. |
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Blade Options: | Standard as per sketch | |||
Finish Options: | PR | = Primed Black (Optional) | ||
MF | = Mill finish (Standard) | |||
Blade Spacings | 25mm | Standard | ||
Ordering Procedure: Example | |||||||
REF | QTY | SIZE (LxH) | TYPE | ACCESS | FRAME | FINISH | SPECIAL INSTRUCTIONS |
2 | 10 | 381 x 381 | OBD | - | STD | MF | TO FIT CD |
Note: |
(1) Dimensions given are for - To fit ON of mother grille |
(2) If OBD to fit grille, indicate type of grille, outside neck size. |