Roof Curb Mounting, Ductwork Connections

Roof Curb Mounting

Roof curb details including duct location dimensions, are available on Roof Curb Assembly Instructions, Part Number 472119.

Rooftop units require curbs to be mounted first. The duct connections must be located so they will be clear of structural members of the building.

1.Factory Supplied Roof Curbs: Roof curbs are Model GKD. The GKD ships in a knockdown kit (includes duct adapter) and requires field assembly (by others). Assembly instructions are included with the GKD curbs.

2.Install Curb: Locate curb over roof opening and fasten in place. (Refer to Recommended Roof Openings). Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. For proper unit operation, it is important that the installation be level. Shim as required to level.

3.Install Ductwork: Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines. Duct adapter provided to support ducts prior to setting the unit.

4.Install Insulation: One-inch deep insulation pans were provided with the curb assembly. Install insulation prior to setting the unit.

Insulation is not included from the factory.

5.Set the Unit: Lift unit to a point directly above the curb and duct openings. Guide unit while lowering to align with duct openings. Roof curbs fit inside the unit base. Make sure the unit is properly seated on the curb and is level.

Curb Outside Dimensions and Weights

Curb Outside Dimensions - continued

Unit Side

1.895	Unit Base

4.844		Insulation Pan

	(Insulation not included)

Roof Curb

1.549

0.775

Curb Cap Details for Factory Supplied Roof Curbs

Ductwork Connections

Examples of poor and good fan-to-duct connections are shown below. Airflow out of the fan

should be directed straight or curve

the same direction as
the fan wheel rotates.							tion
						a
					t
Poor duct installation				R	o
				R

will result in low airflow
and other system							POOR
effects.							POOR
effects.
			tion	Length of Straight Duct
		a
	t
R	o
R

GOOD

W	L	WF	LF

Unit Size	L	W	LF	WF	Curb Weight
Unit Size	L	W	LF	WF	(lbs.)
					(lbs.)

ERVe-20	61.125	40.375	64.875	44.125	93

ERVe-35	63.375	48.5	67.125	52.25	106

ERVe-45	67.375	55.5	71.125	59.25	120

ERVe-55	78.25	65.5	82	69.188	148

All dimensions are in inches. Weights are for 14-inch high GKD type curbs.

Recommended Discharge Duct Size and Length

Model	Blower Size	Duct Size	Straight Duct Length

ERVe-20	9	14 x 14	36

ERVe-35	10	20 x 20	36

ERVe-45	12	20 x 20	36

ERVe-55	15	28 x 28	60

All dimensions shown in inches.

•Recommended duct sizes are based on velocities across the cfm range of each model at approximately 800 feet per minute (FPM) at minimum airflow and up to 1600 fpm at maximum airflow. Recommended duct sizes are only intended to be a guide and may not satisfy the requirements of the project. Refer to plans for appropriate job specific duct size and/or velocity limitations.

•Straight duct lengths were calculated based on 100% effective duct length requirements as prescribed in AMCA Publication 201. Calculated values have been rounded up to nearest foot.

Model ERVe Energy Recovery Unit 5

ERVe specifications

The Greenheck Fan ERVe series stands at the forefront of energy-efficient ventilation solutions, specifically designed to meet the growing demands for energy conservation and enhanced indoor air quality in commercial buildings. As part of Greenheck's commitment to innovation, the ERVe series offers a variety of models tailored to diverse applications, including schools, hospitals, and office buildings.

One of the key features of the ERVe series is its advanced energy recovery technology. The ERVe utilizes a heat recovery wheel that efficiently transfers heat and moisture between the exhaust and incoming airstreams. This process significantly reduces heating and cooling loads on HVAC systems, promoting energy savings and improving overall system efficiency. By reclaiming energy that would otherwise be wasted, the ERVe ensures that buildings not only conform to energy codes but also contribute to sustainability goals.

The ERVe series is designed with versatility in mind. It offers multiple configurations, including vertical and horizontal orientations, which makes it adaptable to various installation environments. Additionally, the unit can be equipped with a range of options such as pre-filters, post-filters, and variable speed drive motors, allowing for customization based on specific application needs. This adaptability ensures that the ERVe can meet the specific air quality requirements of different spaces while maintaining optimal airflow.

Another significant characteristic of the ERVe series is its low noise operation. The design incorporates advanced acoustical features, including sound attenuators and insulated panels, which minimize sound transmission and enhance occupant comfort. As noise control becomes increasingly important in settings like educational institutions and healthcare facilities, the ERVe series excels in providing a peaceful indoor environment.

Moreover, the ERVe series is engineered with durability in mind. Constructed from high-quality materials, the units are built to withstand the rigors of continuous operation. The robust design not only extends the service life of the equipment but also reduces maintenance requirements, leading to lower overall operational costs.

In terms of control and monitoring, the ERVe series is compatible with various building management systems, allowing for integration into sophisticated HVAC controls. This feature enables real-time data tracking and optimization, enhancing the efficiency of indoor climate management.

Overall, the Greenheck Fan ERVe series represents a significant advancement in ventilation technology, combining energy efficiency, customizable features, low noise operation, and durability. These characteristics ensure that the ERVe is a reliable choice for modern commercial buildings striving for improved air quality and reduced energy consumption.