StarTech.com RKPNL4U — 4U Solid Blanking Panel for 19" Racks
4USolid steel19" EIA-310-DM6 hardware included
The StarTech.com RKPNL4U is a 4U solid steel blanking panel that closes an unused gap in a 19" server or network rack, keeping hot exhaust air from recirculating to the front of your equipment and giving the cabinet a clean, finished front. It is aimed at anyone running switches, servers or UPS units in a rack with empty positions between devices.
Blanking panels are one of the simplest airflow fixes in a rack: without them, cooling fans pull warm air back through open gaps instead of drawing cool air from the front. A single 4U panel covers a large gap in one piece, and the powder-coated black finish matches most modern cabinets.
Before you order: 19" racks only. The supplied hardware is M6 screws with M6 cage nuts, which suits square-hole rails; for threaded or round-hole rails use screws that match your rack.
What's in the Box
- 1 x 4U solid blanking panel (black steel)
- 4 x M6 screws
- 4 x M6 cage nuts
What It Means in Practice
- Covers four rack units (177 mm) in one piece — fewer panels to fit than using 1U blanks.
- Stops hot-air recirculation through empty positions, helping switches and servers run cooler.
- Solid face hides empty space and cabling behind it for a tidier, more professional front.
- Everything needed for a square-hole rack is in the box, so it fits straight away in most cabinets.
What Will Not Work
- Will not fit 10" racks or wall brackets narrower than 19".
- Not vented — do not use it where you deliberately want air to pass through the front.
- Does not route or hold cables; it is a cover, not a cable manager.
- The M6 hardware will not suit 10-32 threaded rails; use your rack's own screws there.
Key Features
4U in one panel
Closes a 177 mm gap with a single part instead of stacking smaller blanks.
1.2 mm cold-rolled steel
Rigid enough to stay flat across the full 19" width.
Black powder-coated finish
Matches most modern server and network cabinets.
Hardware included
Four M6 screws and cage nuts for square-hole rails are supplied.
Technical Specifications
| Identification |
| Brand |
StarTech.com |
| Part Number |
RKPNL4U |
| EAN/GTIN |
0065030890175 |
| Product Type |
Rack blanking panel (solid) |
| Physical |
| Rack Height |
4U |
| Dimensions |
482 x 177 x 15 mm |
| Weight |
1.1 kg |
| Material |
Cold-rolled steel, 1.2 mm |
| Finish / Colour |
Powder-coated, black |
| Pack Quantity |
1 |
| Compatibility |
| Rack Standard |
EIA-310-D, 19" |
| Hardware Supplied |
4 x M6 screws, 4 x M6 cage nuts |
| Warranty |
| Warranty |
1-Year Warranty (Singular) |
| Manufacturer Term |
2-year manufacturer warranty per StarTech.com (UK/EU terms) — claims handled through Singular |
Frequently Asked Questions
Why do I need blanking panels?
Open rack positions let hot exhaust air flow back to the front intake of your equipment. Closing them forces fans to draw cooler front air, which lowers operating temperatures.
Can I use it in a wall cabinet?
Yes, in any 19" wall or floor cabinet with standard EIA-310 rails and at least 4U free.
Is it tool-less?
No. It screws to the rails with the included M6 screws and cage nuts.
Singular Expert Insight · Buyer's Guide
Blanking panels are the most overlooked part of a rack, yet they are the cheapest way to lower intake temperatures in a closed cabinet. A 4U solid panel is ideal for the gap left above a UPS or below a switch stack, and because StarTech includes the M6 hardware there is nothing else to order for a standard square-hole rack. For smaller gaps or brush-entry panels see our
rack accessories range.
✓ Buy it if you have a 4U empty space in a 19" rack and want to improve airflow and appearance.
✕ Skip it if you need cables to pass through the front — choose a brush panel instead.
→ Also consider StarTech.com CMDUCT1UX 1U covered cable duct, or 1U/2U blanking panels for smaller gaps.
Not sure it fits your setup? Send us the model of your rack, switch or device and we will check compatibility before you order.