Roof Curb Mounting, Duct Work Connections

ROOF CURB MOUNTING

1.Factory Supplied Roof Curbs

Roof curbs are Model GKD, which are shipped in a knockdown kit and require field assembly (by others). Assembly instructions are included with the curb.

2.Cut Roof Opening and Locate Curb

Layout the unit roof opening such that the supply discharge & exhaust inlet of the unit will line up with the corresponding ductwork (refer to Recommended Roof Openings on page 3). Be sure to allow for the recommended service clearances. Keep the supply inlet of the unit away from any other exhaust fans.

3.Install Curb

Locate curb over roof opening and fasten in place. Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. Shim as required to level. Lower unit onto curb by following the LIFTING instructions on page 3 of this manual. Note,

roof curbs fit inside Curb Outside Dimensions
the unit base.
the unit base.	Model	L	W
	Model	L	W
4. Install Duct Work
4. Install Duct Work	HRE-20	93	51
Installation of all				L
Installation of all	HRE-45	100.5	60.63	L
ducts should be	HRE-45	100.5	60.63	W

	HRE-55	112.75	71.5
done in accordance	HRE-55	112.75	71.5
done in accordance	HRE-90	125.75	90.75
with SMACNA and	HRE-90	125.75	90.75	FIGURE 3
AMCA guidelines.	All dimensions shown are in inches.
	All dimensions shown are in inches.

DUCT WORK CONNECTIONS

Examples of good and poor fan-to-duct connections are shown below (See FIGURE 4). Airflow out of the fan should be directed straight or curve the same direction as the fan wheel rotates. Poor duct installation will result in low airflow and other system effects.

		tio
	a
t
o

Length of Straight Duct

		tio
	a
t
o

GOOD	FIGURE 4

POOR

SUPPLY WEATHERHOOD

Supply weatherhood will be factory mounted.

EXHAUST WEATHERHOOD

The exhaust weatherhood is shipped separately as a kit with its own instructions.

EXHAUST DAMPERS

Backdraft dampers for exhaust discharge are mounted in the unit. Motorized dampers are shipped loose (inside HRE) and must be field installed.

HRE-55, HRE-45, HRE-90, HRE-20 specifications

The Greenheck Fan HRE series, specifically the models HRE-20, HRE-90, HRE-55, and HRE-45, represents a blend of innovation and efficiency in the HVAC industry. Built for both commercial and industrial applications, these exhaust fans stand out due to their robust design and advanced operational features.

One of the main features of the HRE series is its energy-efficient motor design. These fans come equipped with a premium efficiency motor that reduces energy consumption while maintaining high performance. The motors are specifically designed to provide exceptional airflow while operating at lower sound levels, ensuring a quieter environment.

The HRE models also showcase advanced aerodynamic design, featuring optimized blade geometry that enhances airflow performance. This design ensures that the fans can deliver consistent and effective air movement even at varying operational conditions. This makes the HRE series suitable for use in a wide range of applications, from commercial kitchens to industrial processes.

Another significant characteristic of the HRE series is its durability. Constructed from high-quality materials, these fans are built to withstand harsh environmental conditions and prolonged usage. The robust casing and corrosion-resistant finishes ensure longevity, reducing the need for frequent repairs or replacements.

In terms of installation and maintenance, the HRE series offers significant advantages. The fans are designed for easy installation with clear mounting instructions. Additionally, maintenance procedures are simplified, allowing for hassle-free access to critical components, which reduces downtime and operating costs.

Technologically, the HRE models incorporate advanced controls and monitoring systems. These systems can offer real-time feedback on operational performance, allowing for proactive maintenance and energy management. Integrated controls can be customized to work with building management systems, providing users with seamless integration and control capabilities.

Overall, the Greenheck Fan HRE-20, HRE-90, HRE-55, and HRE-45 exemplify a commitment to quality and efficiency in commercial and industrial ventilation solutions. Their combination of energy efficiency, advanced design, durability, and user-friendly features make them a leading choice for those seeking reliable airflow solutions. These fans not only meet current industry standards but also set a benchmark for performance and innovation in the HVAC sector.