Am I to assume that any excess of the shelf that extends past the back of the rack cabinet will need to be cut off so you can put their covers on???

I'm not sure if I understand that completely right but these shelves are adjustable from as small as 19.5 inches to as long as 38 inches. They adjust via slider cutouts and hardware to bolt them down. This can be seen in the product images. There should not be any cutting. The ends are important to these since the end clips are needed to attach them to the vertical adjustable bars inside server cabinet. If your cabinet interior is smaller than 19.5 (shouldn't be) or larger than these dimensions you may need to look for a different shelf. I have a larger cabinet but the vertical cabinet bars are adjusted to the depth of my servers and this shelf is adjusted to the same depth to attach properly.

Will this fit my 2u height server?

This is a shelf and not rails for a for a rack server. The only question is whether it will hold the weight of what you want to put on it

Could a 4U server without rail kit sit on top of this in an open rack?

Please do not take this as the official answer. It is pretty solid. And it is rated to 175 pounds. I have an old Mac Pro, 5 MacMinis, and a switch on mine. It isn't flexing at all. I have no concern about adding 5 more MacMinis. 175 pounds is a lot. Hopefully that helps. With all the weight you are putting on it, be sure you put the screws in tight. :)

will it fit a 19wide by 19 deep rack

I have a 21” rack and it doesn’t fit, I’m going to have to extend it, mounting brackets don’t fit.

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StarTech.com 1U Adjustable Vented Server Rack Mount Shelf - 175lbs - 19.5 to 38in Deep Universal Tray for 19" AV/ Network Equipment Rack (ADJSHELF)

StarTech.com 1U Adjustable Vented Server Rack Mount Shelf - 175lbs - 19.5 to 38in Deep Universal Tray for 19" AV/ Network Equipment Rack (ADJSHELF)

Product ID: 54800456

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Details

Brand
StarTech
Colour
Black
Product dimensions
70.1D x 44.5W
Size
50 - 97 cm
Material
Alloy Steel

📏Adjustable depth 19.5-38in

🌬️Vented for optimal airflow

🛡️Supports up to 175lbs heavy-duty

Description

🖤 Elevate your rack game with the ultimate adjustable vented shelf!

UNIVERSAL 19 FIT - Seamlessly integrates with any standard 19-inch server rack for ultimate compatibility.
HEAVY DUTY DURABILITY - Constructed from commercial-grade cold-rolled steel to support up to 175lbs with confidence.
MAXIMIZED VENTILATION - Vented design ensures your critical AV and network gear stays cool under pressure.
FLEXIBLE MOUNTING DEPTH - Adjustable 19.5 to 38-inch mounting depth adapts to your evolving equipment needs.
IT PROS TRUSTED CHOICE - Backed by lifetime warranty and 24/5 multilingual tech support for peace of mind.

The StarTech.com 1U Adjustable Vented Server Rack Mount Shelf is a robust, versatile solution designed for 19-inch racks. Featuring an adjustable mounting depth from 19.5 to 38 inches and a fixed surface depth of 27.56 inches, it supports heavy equipment up to 175lbs. Its vented design maximizes airflow to keep your AV and network devices cool, while its commercial cold-rolled steel construction ensures long-term durability. Trusted by IT professionals, it comes with a lifetime warranty and dedicated technical support.

Specifications

Brand	StarTech
Product Dimensions	44.5 x 4 x 70 cm; 4.42 kg
Item model number	ADJSHELF
Manufacturer	Startech
Series	1U Adjustable Mounting Depth Vented Rack Mount Shelf - 175lbs / 80kg
Colour	Black
Processor Count	1
Are Batteries Included	No
Item Weight	4.42 kg
Guaranteed software updates until	unknown

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