RackPath 1U Blank Rack Mount Panel Spacer with Venting for 19in Server Rack Enclosure or Network Cabinet – 2 Pack, Black

Been around racks for the last 40 years and these 4U vented spacers are of good quality in my opinion. They are highly perforated and the bends on the top and bottom make them rigid. The included hardware is a bonus.

Good price too.

Recommended

I had no issues fitting these into my 29 inch rack, they also properly take up just 1U as expected. They are made of decently thick metal that doesnt seem like it will warp or bend easily. The holes are more than large enough to provide the much needed venting between rack components so these have been a lifesaver in that regard. The box also includes a set of cage nuts, screws and washers for mounting them, as expected with this kind of product.