valutazioni - 4, GPA: 4.3
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Facilità d'uso
The damper is opened by air pressure differential and closed by gravity. Standard models include adjustable counterbalance weights to assist closing. 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 (13m/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: Maximum Panel Size: 8 in. W x 11 in. H (203mm x 279mm) 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. EM-40 3 vtT No Flange 3 /8 in. _i_ 3 in. r L 11 1/8 in. 5 in. I o EM-41 Flange On Discharge M K 1 1/2 in. Options and Accessories • 11/2 in. flange on discharge: EM-41 • 11/2 in. flange on intake: EM-42 • 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: 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) EM-42 Flange On Intake 1 1/2 in. H K n 0 0 0 0 0 » Counterbalance weights may require field adjustment. Instructions are available at greenheck.com. Performance Data EM-40 Performance data results from testing a 36 in. x 36 in. (914mm x 914mm) damper in accordance with AMCA Standard 500-D using Figure 5.7A (unducted). All data has been corrected to represent standard air at 0.075 lb/ft3 (1.201 kg/m3). Pressure Drop Operational Data ÆP in. wg (Pa) Velocity fpm (m/s) Damper with Standard Bearings Blades Start to Open 0.07 (17) 50 (.254) Blades Fully Open 0.20 (50) 1200 (6.2) Leakage testing was conducted in accordance with AMCA Standard 500-D and is expressed as CFM per sq. ft. of damper face area. All data has been corrected to represent standard air at 0.075 lb/ft3 (1.201 kg/m3). Leakage 36 in. x 36 in. Damper Velocity (fpm) Pressure Limitations 5 6 7 8 9 1 0 20 Air Leakage in CFM/Sq. Ft. Damper Width (in.) 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-to-blade linkage. Damper manufacturer’s printed application and performance data including pressure, velocity and temperature limitations shall be submitted for approval showing damper suitable for pressures to 10 in. wg (2491 Pa), velocities to 3500 fpm (18 m/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-40. Velocity Limitations 2500 fpm 3000 fpm 3500 fpm i^GREENHECK P.O. Box410-Schofield, Wl54476-0410 ■ 715.359.6171 •greenheck.com 0 12 24 36 48 Damper Width (in.) Copyright © 2008 Greenheck Fan Corporation EM-40 Rev 4 Aug 2008 2 3 4 5 6 7 8 910 x 10 2 3 4 5 6 7 8 910 x 100 2 3 4 5 6 7 8 910 x 1000 74 60 36...