how many things can you put on it?

As many as will fit in 42U. Each item you rack in this will have a U height that can vary from 1 to 4 typically. to answer your question 10.5-42 items depending on said items height.

I currently own this rack and am wondering if there is anyway to add sides to it? Part# ?

If you are talking about server slide rails then yes. All 5 of my servers are on sliding rails.

Hello, Thank you for contacting us in regards to your question. The dimensions of this item is 84.3" x 20.25" x 47.0". Thank you, Newegg Support

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Tripp Lite SR4POST 45U 4-Post SmartRack Open Frame Rack - Organize and Secure Network Rack Equipment

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Black
4 Post Open Frame Rack

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45U 4-Post Smart Rack

Model
Brand	Tripp Lite
Model	SR4POST

Details
Type	4 Post Open Frame Rack
Rack Units	45U
Color	Black

Features
Features	Black steel with square, numbered mounting holes Toolless button holes to accept PDUs or cable managers

Dimension & Weight
Unit Dimension	84.3" x 20.25" x 47.0"
Unit Weight	73.0 lbs

Additional Information
Date First Available	January 09, 2019

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Return for replacement within: 30 days
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Item#: 9SIA0ZX2C36767

Best Sellers

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Tripp Lite SR4POST 45U 4-Post SmartRack Open Frame Rack - Organize and Secure Network Rack Equipment

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Customer Reviews of the Tripp Lite SR4POST

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

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