Inlet and Outlet Sound Power Levels

All Greenheck mixed flow fans have AMCA licensed sound power levels for both the fan inlet and outlet.

Application and installation determines which sound power reading (inlet, outlet, or both) is critical. The differences between the generated sound from the inlet and outlet are important and noticeable. AMCA licensed inlet and outlet sound power data provides complete sound information to select a fan based on the acoustical requirements. For additional information on sound, refer to page 6.

Patented (QEI/QEID)

USA Patent No. 7048499

China (P.R.) Patent No. CN1294361C

Mexico Patent No. 243465

Greenheck’s Sound Lab

Field Rotatable Housing / Compact Size

The QEI-L and QEI are designed to accommodate changing fan mounting positions and motor orientation in the field. Mounting

fixtures are securely bolted to the fan casing and can be relocated to reposition how the fan is installed or the position the motor is oriented. Flexibility in a motor’s location is important for easier

access and can determine where the unit will fit. Last minute design changes or unexpected obstacles during installation are no longer a problem.

Greenheck’s mixed flow fans were designed for compact size. Keeping size to a minimum is important when fitting into tight spaces like mechanical rooms or air handlers.

Slip-Fit Duct Connections

The inlet and outlet ends of the QEI-I/II and QEID are designed to accept “slip-fit” connections. Often companion flanges are bolted

to a fan’s inlet/outlet flange to provide a slip-fit connection for a flexible sleeve, as with the QEI-L. This extra step is now eliminated by directly attaching the flexible sleeve to the duct and fan. This saves time and money in the installation process.

It is recommended to use a flexible sleeve connection instead of a rigid duct connection.

The advantages of a flexible transition are:

•Decreased sound transmission in the ductwork

•Flexible connections allow for minor misalignment

•Accommodates the use of thrust restraints to resist thrust loads

AutoCAD® and 3-D Revit® Models

Scaled AutoCAD® drawings and Revit® models are available through Greenheck’s website or from the Greenheck CAPS program which retrieves drawings and places them automatically into a job folder.