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Fan Price VFD Price
Example: Initial Cost Comparison
Belt Drive vs. Direct Drive Vari-Green
$0 100 200 300 400 500 600 700
GB-121
G-123-VG
The diagram shows how the overall cost of a fan with a direct
drive Vari-Green motor is less than the cost to purchase a belt
drive and add a VFD to it.
Demand controlled systems reduce the energy
consumed by decreasing the speed of the fan and
energy used by the motor. The system controls
will lessen the amount of conditioned air that is
exhausted, further reducing the total operating costs.
A 0-10 VDC control signal is easily used in
conjunction with:
• BAS - Building Automation System
• GreenVent System Controls - for constant
pressure
• CO
2
Sensors - Monitors carbon dioxide levels
• VOC Sensors - Monitors a range of volatile
organic compounds
• Motion Detectors - Monitors occupancy
For additional information refer to the Vari-Green
Motor brochure.
$2,000-
1,750-
1,500-
1,250-
1,000-
750-
500-
250-
$-
Variable Volume vs. Constant Volume
Variable Volume Constant Volume
Heating Cost ($/yr) Cooling Cost ($/yr) Fan Operating Cost
Example of
potential saving
based on a
northeast city in
the USA using a
GreenVent System.
Example
Cost/Savings
Comparisons
Demand Control Ventilation
for multi-story buildings
Applications requiring constant pressure
control or variable volume as used in
multi-storied buildings such as hotels,
multi-family complexes, institutional
facilities, and high rise commercial buildings,
may utilize G fans with Vari-Green™ motor and
Vari-Green™ control.
The Vari-Green constant pressure control
is preprogrammed and easy to install for
applications that include—venting dryers,
bathrooms, residential type kitchen space or
industrial process exhaust.
Refer to the GreenVent Systems brochure for
more detailed information on benefits and
energy savings.
LEED information
Greenheck became one of the first
manufacturers in the Air Movement and
Control industry to join the LEED/green
movement when they joined the United States
Green Building Council (USGBC) in 2005.
Greenheck has been actively researching
qualification requirements for our products to
meet LEED credits and prerequisites.
The Vari-Green™ motor significantly
helps qualification efforts for the
Energy and Atmosphere credits and
prerequisites — specifically credit one,
Optimize Energy Performance and prerequisite
two, Minimum Energy Performance.
Vari-Green
™
Controls
Remote mounted dial — wall mounted dial allows
fan to be controlled at point of use and includes
a transducer.
Two-speed control — provides the ability to
preset a high and low at the fan and control with a
timed position switch at the point of use.
Transformer — reduces 115V power to 24V power
Constant pressure — maintains negative pressure
(-1.0 wg to = 1.0 wg) for applications such as
bathrooms, dryers, filters, etc.