Centrifugal Roof Exhaust Fans (Models G/GB)
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Centrifugal Roof Downblast Exhaust Fans Models G and GB • General Clean Air • Light Contaminants • Seismic • High Wind • Variable Volume Performance data now included.

Models G and GB Spun Aluminum • Downblast Centrifugal Roof Exhaust Fans US LISTED *UL/cUL is optional and must be specified G and GB models are listed for electrical (UL/cUL 705) File no. E40001 GB models for Emergency Smoke Control Systems (UL/cUL Listed for 500°F (260°C) for 4 hours and 1,000°F (538°C) for 15 minutes) File no. MH17511 High Wind Certification Miami-Dade NOA No. 12-0120.13 for high wind and hurricane zones Seismic Certification OSHPD No. 0148-10 - Office of Statewide Health Planning and Development (California) IBC 2009 and 2012 - International Building Code Enjoy...

Models G and GB Spun Aluminum • Downblast Centrifugal Roof Exhaust Fans Greenheck models G and GB centrifugal roof exhaust fans provide the industry’s best performance and durability for general clean air applications where air is discharged downward, toward the roof surface. • Broadest performance in the industry, up to 3.25 in. wg (810 Pa) and 45,000 cfm (76,500 m3/hr). • Most advanced motor cooling of any fan in its class. • Performance as cataloged is assured. All fan sizes are tested in our AMCA Accredited Laboratory, and all models are licensed to bear the AMCA Sound and Air...

Disconnect Switch An aluminum, backward-inclined, non-overloading centrifugal wheel is utilized to generate high-efficiency and minimal sound. Wheel cones are carefully matched to the venturi for maximum efficiency. Each wheel is robotically welded and statically and dynamically balanced for long life and quiet operation. NEMA-1 switch is factory mounted and wiring is provided from the motor as standard (other switches are available). All wiring and electrical components comply with the National Electrical Code® (NEC) and are either UL Listed or Recognized. Precisely sized, ground and...

Construction Features Models G and GB 6 MODEL G DIRECT DRIVE DRIVE FRAME (BELT DRIVE) 13 18 19 MODEL GB BELT DRIVE

Emergency Smoke Control - GB When you buy a Greenheck model GB with the smoke control option, you receive a fan with the industry’s best performance and durability for smoke control applications (as found in emergency smoke control systems). GB smoke control models are: 101, 101-HP, 121, 131, 141, 141-HP, 161, 161-HP, 200, 240, 300, 360, 420, 480 • UL/cUL Listed for 500°F (260°C) for 4 hours and 1,000°F (538°C) for 15 minutes. • Half the weight of traditional smoke control fans, ideal choice for roof load concerns. • Low profile, height is less than half of traditional smoke control fans,...

High Wind and Hurricane - G and GB Greenheck is leading the High Wind Standard for roof top fans and ventilators. Forceful winds and wind-borne debris are the cause of most hurricane damage. Hurricane winds start at 75 mph. and can exert a force of 75 pounds per square foot of pressure—or over 900 pounds on a fan and curb. Forceful winds are not the only problem, wind-borne debris can also cause detrimental effects to objects and structures. High winds and extreme forces are the cause of most storm damage. By analyzing calculations, computer simulations, actual testing, and other...

Vari-Green® Motor Option 2. Control Wire Inputs - the motor accepts a 0-10V DC signal from Building Automated Systems or other controls to adjust motor speed. Benefits Operates on AC power that’s converted to DC— providing a more efficient motor operation as compared to an AC operation. • The motor can attain up to 85% efficiency and reduce energy consumption. • Watt savings of 30-70% depending on RPM. Note: As motor speed is turned down, efficiency stays high as compared to an AC motor that decreases dramatically. • Operates cooler than a standard AC motor at lower RPMs. A cooler motor has...

Vari-Green® Control Options Vari-Green® Controls Transformer - Provides 24V power from the existing line voltage at the fan to the Vari-Green motor and controls. Dual voltage primary (120/240V) transformer provided with the fan. Remote Dial - Allows for remote, manual airflow adjustments. Wall plate with dial may be mounted in a standard 2x4 inch electrical junction box. Two Speed Control with Integral Transformer Control allows motor rpm to be set at two independent speeds (high or low). Meets minimum airflow requirements with the ability to bump up to high speed in an emergency or meet...

Roof Curbs Prefabricated roof curbs reduce installation time and costs by ensuring compatibility between the fan, the curb and roof opening. All curbs are insulated with fiberglass. A wide variety of roof curbs are available, including: flanged, pitched and sound-absorbing. Hinged Curb Cap with Cables (Field Installed) Mounted to the curb cap, allows entire fan to tilt away from curb for access to wheel and ductwork. Includes restraint cables. Hinged Base (Factory Mounted) Allows for easy maintenance. Hinge and restraining cables are factory mounted to a subbase attached directly to curb...

Speed Controllers for Standard Motors Available for use with shaded pole and permanent split capacitor (PSC) open motors on model G fans. They provide an economical means of system balancing with direct drive fans. Disconnect Switches A wide selection of NEMA rated switches are available for positive electrical shutoff and safety, including: dust-tight, rainproof, and corrosion-resistant. Switches may be internally or externally mounted. G and GB models are Listed for electrical (UL/cUL 705) File no. E40001 GB models for Emergency Smoke Control Systems (UL/cUL Listed for 500°F (260°C) for 4...

Typical Installations Models G and GB General Clean Air (figure 1) Factory Wired from Motor to Disconnect Models G and GB exhaust fans are designed to meet the needs of general clean air applications. Tests were conducted to assure safe, rugged and reliable fans. Due to the varying types of airstreams encountered in commercial ventilation, system designers must be aware of national, state, and local codes and guidelines governing these installations. Local code authorities should be consulted before proceeding with any ventilation project. figure 1 3/4 in. Wiring by Others • When roofing...