Greenheck Fan Mixed Flow Fans Belt and Direct Drive QEI-L - Manual (Page 5)

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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.
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.
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.
Patented (QEI/QEID)
USA Patent No. 7048499
China (P.R.) Patent No. CN1294361C
Mexico Patent No. 243465
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
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Greenheck’s Sound Lab