Lennox eNeRGy Series Installation, Operating And Maintenance page 28

DUCT CONNECTIONS
Ducting connection details
The supply and return air ducts can be secured to the flanges at the bottom of the roofcurb.
Any ducting weight above 100 kg must be fixed independently to other building frames.
Distance for duct connection: 150 mm
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eNeRGy-IOM-2020.12-EN 28