Greenheck Extruded Backdraft Damper EM-40 User manual

Application and Design

The EM-40 series is a horizontally mounted backdraft damper that is designed to allow vertical airflow down and prevent

reverse airflow. 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 (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

/4in. (19mm) dia. metallic

Bearings: Synthetic (acetal) sleeve type

Linkage: 1

/8in. (3mm) plated steel

Blade Seals: Vinyl

Size Limitations

Minimum Size: 8 in. W x 11 in. H

(203mm x 279mm)

Maximum Panel Size: 48 in. W x 74 in. H

(1219mm x 1880mm)

Options and Accessories

 • 11

/2in. flange on discharge: EM-41

 • 11

/2in. 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:

EM-40 SERIES

Horizontal Mount - Vertical Airflow Down

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.

*W & H dimensions furnished approximately 1

/4in. (6mm) under size.

Extruded BACKDRAFT DAMPER

ADJUSTABLE COUNTERBALANCE

in.

Airflow

in.

3 in.

5 in.

in.

EM-40

No Flange

EM-41

Flange On

Discharge

EM-42

Flange On

Intake

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) Counterbalance weights may require ﬁeld adjustment. Instructions are

available at www. greenheck.com.

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 31Ú8in. (79mm) depth; blades from 0.070 in.(1.8mm)

6063T5 extruded aluminum; 3/4in. (19mm) dia. metallic axles

turning in acetal bearings; damper shall be equipped with

extruded vinyl blade seals; and internal 1

/8in. (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

(82ºC).TestingandratingstobeinaccordancewithAMCA

Standard 500-D. Basis of design is Greenheck model EM-40.

Velocity (fpm)

x 10

Pressure Loss ( In. wg)

2 3 4 5 6 7 8 910

1.0

.10

.09

.08

.07

.06

.05

.04

.03

.02

x 100

2 3 4 5 6 7 8 910

x 1000

2 3 4 5 6 7 8 910

Pressure Drop

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 Limitations

Velocity Limitations

Pressure (in. w.g.)

483624120

4.0 in. w.g.

6.0 in. w.g.

Damper Width (in.)

8.0 in. w.g.

10.0 in. w.g.

012243648

3000 fpm

2500 fpm

Damper Height (in.)

Damper Width (in.)

3500 fpm

140

1.0

Static Pressure Difference

Air Leakage in CFM/Sq. Ft.

1 2 3 4 5 6 7 8 910 20 30 40 50 60

Static Pressure Difference

1.0

Air Leakage in CFM/Sq. Ft.

1 2 3 4 5 6 7 8 910 20 30 40 50 60 70 80 90 100 150

EM-10

Air Leakage in CFM/Sq. Ft.

1 2 3 4 5 6 7 8 9

20 30 40 50 60 70 80 90100 150

1.0

8.5

Static Pressure Difference

130

With Seals

Without Seals

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

EM-40Rev4Aug2008

Performance Data EM-40

Operational Data ÆP in. wg

(Pa)

Veloc-

ity 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)

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