Extruded BACKDRAFT DAMPER
EM-30 SERIES
Vertical Mount - Horizontal Airflow
Application and Design
The
Ratings (See page 2 for specific limitations)
Pressure: 4.0 - 10.0 in. wg (996 Pa- 2491 Pa)
differential pressure.
Velocity: 2500 to 3500 fpm (13 m/s - 18 m/s)
Temperature: 180°F (82ºC)Standard Construction
Frame: Heavy gauge 6063T5 extruded aluminum. (0.125 in. [3.2mm] thickness)
Blades: Heavy gauge 6063T5 extruded aluminum. (0.070 in. [1.8mm] thickness)
Axles: 3/4 in. (19mm) dia. metallic
Bearings: Synthetic (acetal) sleeve type Linkage: 1/8 in. (3mm) plated steel
Blade Seals: VinylH*
W*
*W & H dimensions furnished approximately 1/4 in. (6mm) under size.
Size Limitations |
| 11 1/8 in. | |
Minimum Size (without weights): | 8 in. W x 8 in. H | 3 in.* | 5 in. |
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| (203mm x 203mm) |
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| Minimum Size (with weights): | 8 in. W x 11 in. H |
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| (203mm x 279mm) |
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*Optional counterbalance weights dimensioned (5/8 in. without weights).
Maximum Size: 48 in. W x 74 in. H (1219mm x 1880mm)
Sizes larger than maximum shown will be supplied as two or more equal size smaller dampers required to make up the size specified. These larger multiple damper assemblies require field assembly and may require additional reinforcement (not supplied by Greenheck) to support the assembly.
Options and Accessories
•Counterbalance Weights
•APC (Adjustable Pressure Controller). Allows field setting of relief pressure on
Airflow
| all EM dampers. Use one per panel. |
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| 11/2 in. | 11/2 in. |
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| Maximum recommended pressure set |
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| 31/8 in. |
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| limitations are as follows: |
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| No Flange | Flange On |
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| Flange On | ||||
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| Discharge |
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| Intake | ||||
| Area ft2 | Maximum Set |
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| Pressure |
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| (m2) |
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| in. wg (Pa) |
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| 4 | (.37) | .75 (187) |
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| 6 | (.56) | .50 (125) |
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| 8 (100) | .40 (100) |
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| 10 (.93) | .30 (75) |
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| 15 | (1.39) | .20 (50) |
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| 20 | (1.86) | .15 (37) |
| Counterbalance weights may require field adjustment. Instructions are | |||||||||||||
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| 24 | (2.23) | .125 (31) |
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| available at www. greenheck.com. |
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