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manual abstract
wg (996 Pa- 2491 Pa) differential pressure. Velocity: 2500 to 3500 fpm (13 m/s - 18 m/s) Temperature: 180°F (82.C) 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: Vinyl Size Limitations Minimum Size (without weights): Minimum Size (with weights): Maximum Size: Application and Design The EM-30 series is a vertical mounted backdraft damper that is designed to allow horizontal airflow and prevent reverse airflow. The damper is opened by H* W* *W & H dimensions furnished approximately 1/4 in. (6mm) under size. * Optional counterbalance weights dimensioned (5/8 in. without weights). 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 all EM dampers. Use one per panel. Maximum recommended pressure set limitations are as follows: (EM-30 damper must be equipped with counterbalance.) Area ft2 (m2) Maximum Set Pressure in. wg (Pa) 4 (.37) .75 (187) 6 (.56) .50 (125) 8 (100) .40 (100) 10 (.93) .30 (75) 15 (1.39) .20 (50) 20 (1.86) .15 (37) 24 (2.23) .125 (31) 8 in. W x 8 in. H (203mm x 203mm) 8 in. W x 11 in. H (203mm x 279mm) 48 in. W x 74 in. H (1219mm x 1880mm) 31/8 in. Airflow 11/2 in. 11/2 in. 11 1/8 in. 3 in.* 5 in. EM-30 EM-31 EM-32 No Flange Flange On Flange On Discharge Intake Counterbalance weights may require field adjustment. Instructions are available at greenheck.com. Performance Data EM-30 Performance data results from testing a 36 in. x 36 in. Pressure Drop (914mm x 914mm) damper in accordance with AMCA Standard 500-D using Figure 5.3 and Figure 5.5. All data has been corrected to represent standard air at 0.075 lb/ft3 (1.201 kg/m3). Operational Data .P in. wg (Pa) Velocity fpm (m/s) Figure 5.3 Without Weight Blades Start to Open 0.03 (7.5) 10 (.05) Blades Fully Open 0.25 (62) 2500 (12.7) With Weights Blades Start to Open 0.01 (2.5) 10 (.05) Blades Fully Open 0.055 (13.7) 1200 (6.1) Figure 5.5 Without Weights Blades Start to Open 0.025 (6.2) 10 (.05) Blades Fully Open 0.32 (8) 1200 (6.1) With Weights Blades Start to Open 0.012 (3) 10 (.05) Blades Fully Open 0.08 (20) 700 (3.6) Leakage testing was conducted in accordance with AMCA Standard 500D and is expressed as CFM per sq. ft. of damper Pressure Loss ( In. wg) 10 9 8 7 6 5 4 3 2 1.0 .9 .8 .7 .6 .5 .4 .3 .2 .10 .09 .08 .07 .06 .05 .04 .03 .02 5.3* 5.3 5.5 5.5* * With Counterbalance Weights face area. All data has been corrected to represent standard air 1 2 3 4 5 6 7 8 910 2 3 4 5 6 7 8 910 2 3 4 5 6 7 8 910 x 10 x 100 x 1000 at 0.075 lb/ft3 (1.201 kg/m3). Velocity (fpm) Leakage 36 in. x 36 in. Damper 8.5 Pressure Limitations 8 7 6 10.0 in. w.g. 10 5 4 8 3 WithSeals WithoutSeals 2 .6 .5 .4 0 .3 Damper Width (in.) .2 Velocity Limitations 1 2 3 4 5 6 789 20 30 40 50 60708090100 150 10 74 Air Leakage in CFM/Sq. Ft. 4.0 in. w.g. 6.0 in. w.g. 8.0 in. w.g. 0 12243648 Pressure (in. w.g.) 6 Static Pressure Difference 4 1.0 .9 .8 .7 3000 fpm 2500 fpm 3500 fpm 0 12 24 36 48 60 Specifications Backdraft dampers meeting the following specifications shall be furnished and installed where shown on plans and/or as described in schedules. Dampers shall consist of: heavy gauge 6063T5 extruded aluminum channel frame (0.125 in. [3.2mm] thick) with 31U8 in. (79mm) depth; blades from 0.070 in. (1.8mm) 6063T5 extruded aluminum; 3/4 in. (19mm) dia. metallic axles turning in acetal bearings; damper shall be equipped with extruded vinyl blade seals; and internal 1/8 in. (3mm) plated steel blade-toblade linkage. Damper manufacturer’s printed application and performance data including pressure, velocity and temperature limitations shall be submitted for approval showing damper Damper Height (in.) 36 suitable for pressures to 10 in. wg (2491 Pa), velocities to 3500 fpm 0 Damper Width (in.) (18m/s) and temperatures to 180°F (82.C). Testing and ratings to be in accordance with AMCA Standard 500-D. Basis of design is Greenheck model EM-30. Copyright © 2008 Greenheck Fan Corporation EM-30 Rev 4 Aug 2008 ...