Could this be clamped on a bar above my work space and used in a sort of upside down manner? There is no nearby wall or desk.

It has to be in it's upright position. The way it's build weight (from above) keeps it in place. If you try to mount it upside down it won't work.

What diameter does the pole/pipe/mount need to be to fit or work with this extension arm?

For this arm it is 1.38" (35mm). It is not compatible with the LX HD mount which has a 1.57" (40mm) pole

Will this work with the LX Dual Stacking Arm in order to have a longer arm at the top height?

The top arm is of fixed length and is non adjustable except for up-down tension. The extension allows the unit to expand the length from the wall bracket to the device. The device is raised in height by the height of the extension somewhere round six inches. Only two extensions can be used (raising height 12 inches aprox) and bracket on wall can be mounted lower or higher to set the device to be at the desired level. Excellent quality and durable product, mine is used with a laptop that folds away on the wall when not in use.

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📈 Elevate your monitor game—because your workspace deserves the best!

PIVOT LIKE A PRO - Extra joint delivers unparalleled adjustability tailored to your unique workflow.
EFFORTLESS UPGRADE - Simple installation means you’re up and running in minutes—no hassle, no downtime.
DURABILITY MEETS DESIGN - Premium aluminum build backed by a 10-year warranty ensures stability and style that lasts.
CLUTTER FREE COMMAND CENTER - Built-in cable routing keeps your desk sleek and distraction-free.
EXPAND YOUR WORKSPACE REACH - Add 9 inches of seamless extension to your existing LX Arm for ultimate monitor positioning.

The Ergotron LX Monitor Arm Extension in white adds an additional 9 inches of reach to compatible LX Desk, Wall, or Keyboard Arms, enhancing flexibility with an extra pivot point. Crafted from durable aluminum, it features integrated cable management for a tidy setup and is backed by a 10-year warranty, making it a reliable upgrade for professionals seeking ergonomic excellence.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Fantastic experience overall. Will recommend to friends and family.

1 month ago

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Brand	Ergotron
Manufacturer	Ergotron
Model	45-289-216
Product Dimensions	33.66 x 12.07 x 6.35 cm; 204 g
Item model number	45-289-216
Compatible Devices	Monitors
Batteries Included	No
Batteries Required	No
Material	Aluminium
Mounting Type	Wall Mount
Manufacturer	Ergotron
Item Weight	204 g

Ergotron – LX Monitor Arm Extension – White

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