Greenheck ESRMD-24-415-A7 User Manual

BUILDING VALUE IN AIR.

October

2005

Recirculating Roof Fans

Models ESRMD, ESRMDF and ERD

Four-Way Fan

• Exhaust

• Supply

• Mix

• Recirculate

2

Recirculating Roof Fans

Exhaust/Supply/Recirculation/Mix

Model ESRMD

Ventilation requirements are often subject to daily or seasonal changes in temperature. The
Greenheck Four-Way Fan offers the flexibility to meet changing needs and to maintain
comfortable temperatures in factories, warehouses and other facilities with high ceilings. When
temperatures change with production processes or seasonal shifts, the Four-Way fan can
exhaust, supply, recirculate or mix air as required.

• Model ESRMD fans are available in six direct drive sizes.

• Performance capacities range from 4,000 cfm to 40,000 cfm and up to 0.375 in. wg of static
pressure.

• Exhaust, supply and recirculate modes perform equally.

Cost Savings

By exhausting excess heat, supplying cool air, recirculating stratified warm air, and mixing supply air with recirculated air,
the Four-Way fan also saves heating and cooling costs. When one fan offers four functions, further cost reductions result.
Fewer fans required on the job means lower initial costs and lower installation costs, with fewer roof penetrations.

1. Exhaust

Evacuates excess heat to reduce
cooling costs.

The exhaust/supply damper is
open and the recirculation
dampers are closed.

3. Recirculation

Destratifies warm air accumulated
at ceiling level and directs it
downward to reduce heating costs.

The exhaust/supply damper is
closed and the recirculation
dampers are open.

4. Mix

Comfortable temperatures can be
maintained by tempering supply air
with warmer air trapped at ceiling
level.

The exhaust/supply damper and
the recirculation dampers are
linked to work in combination.

2. Supply

Fresh air can be supplied when
outside temperatures are cooler
(as at night) to reduce cooling
costs.

The exhaust/supply damper is
open and the recirculation
dampers are closed.

One Fan - Four Functions

Model ERD

The model ERD upblast fan is available for applications that
require exhaust and recirculation, and do not require supply or
mixed air. The model ERD has an upblast windband and
butterfly dampers in lieu of the Four-Way fan hood. The
windband is constructed of galvanized steel with butterfly
dampers constructed of aluminum. Aluminum construction is
optional for the windband.

The model ERD offers the same performance as the Four-Way
fan, except in the lower ranges where the minimum CFM must
be maintained to open the butterfly dampers.

Minimum CFM

required to open

butterfly dampers

Size CFM

24 3947

30 6034

36 7618

42 11045

48 12817

54 21425

1. The roof curb is mounted and secured over
the roof opening.

2. The plenum (factory assembled) is lowered
through the curb and roof opening until its
mounting channels rest on the roof curb.
Lifting lugs are provided. (Fig. 1)

3. The fan hood is lowered onto the
curb/plenum assembly. (Fig. 1)

4. The hood and plenum are secured to the
roof curb. (Fig. 2)

Installation Sequence

3

Standard Construction Features

Fan hoods and bases are constructed of galvanized steel. Optional aluminum construction is available. Hood panels are arched
and precision roll formed for strength and weather tightness. They are bolted to heavy gauge support angles. All hood sizes ship
fully assembled except for 54 in. non-filtered, 48 in. and 54 in. filtered.

Birdscreens are constructed

of 1/2 in. galvanized steel
mesh. Optional filters are
available.

Plenums are galvanized

steel, supported at the roof
curb by mounting channels.
For servicing the fan two
removable access panels are
provided. Four lifting lugs are
provided for ease of
installation. (See important
plenum height information on
pg. 4.)

Protective guards mount to

the bottom of the plenum to
protect the fan and nearby
personnel.

Propellers are designed to

produce a high level of
efficiency over a broad
selection range. Tapered
airfoil blades are cast of
aluminum alloy. The propeller
is designed to deliver equal
airflow in the exhaust, supply,
and recirculation modes.
Each propeller is balanced
prior to assembly.

Bases are standard at 12

in. high with pre-punched
mounting holes for easy
installation.

A low leakage control

damper (exhaust/supply)

and two standard control

dampers (recirculation) are

linked for recirculation and
mixing. Construction
consists of galvanized
steel.

Standard damper

actuators are modulating

spring return.

Heavy-duty ball bearing

motors are carefully

matched to the fan load.

Motor support frames are
constructed of heavy
gauge steel angles.

Fan panels are
constructed of heavy
gauge steel with a double
venturi for efficient airflow.

Fig. 1

Hood

Lifting Lugs

Mounting
Channels

Roof
Curb

Plenum

Fig. 2