4-Post Open Frame Racks
4-Post Open Frame Racks combine the mounting security of a cabinet with the accessibility of a rack. Used in communication data centers and telecommunication room applications, these adjustable depth racks support deeper, heavier network equipment. They can be ganged with 2-Post Open Frame Racks or other 4-Post Open Frame Racks to expand existing systems.
4-Post Open Frame Racks are available with square holes or 12-24 tapped rails, in both 19” and 23” EIA panel widths. A variety of shelves and vertical cable managers are available to complete the setup. 4-Post Open Frame Racks ship flat. Assembly required.
Need a 4-Post Open Frame Rack Fast?
We stock the 7′ size. Call us and we can get your order processed immediately at 507-287-3535.
Need A More Robust Rack?
If you need a little more heavy-duty rack, check out our Security/AV Racks with sturdy construction capable of holding up to 1,000 lbs.
Features
4 Post Open Frame Rack Features
- Available in six heights and two widths
- Adjustable Depth Min/Max = 20.50″ / 32.50″ [521 mm / 826 mm]
- Numbered rack spaces – front and rear
- Channels constructed from heavy-duty aluminum extrusion
- Heavy-duty base includes holes for securing to floor
- Ships flat to save space
- 50 pack of extra hardware included
- UL listed
Rack Paint / Finish
- Color: Black
- Our products are finished in textured powder paint. Powder coating provides a durable high-quality finish.
4 Post Load Rating
- 800 lbs. [363 kg.]
Industry Standards
- EIA 310-E
- RoHS compliant
- UL listed
How to Order
- Choose from a variety of sizes – some of which are in stock.
- Contact Us
Sizes Available
Adjustable Depth 4-Post Open Frame Racks – UL Listed
Includes: Rack with Square Hole Rails, Extra Black Rack Screws and Cage Nuts (50 pk), Assembly Instructions. Ships flat. Assembly required.
| 19″ EIA Part Number | 24″ EIA Part Number | Rack Units |
| RRD1903A-CN-BK* | RRD2303A-CN-BK* | 18U [3 ft.] |
| RRD1904A-CN-BK* | RRD2304A-CN-BK* | 24U [4 ft.] |
| RRD1906A-CN-BK* | RRD2306A-CN-BK* | 38U [6 ft.] |
| RRD1907A-CN-BK | RRD2307A-CN-BK | 45U [7 ft.] |
| RRD1908A-CN-BK* | RRD2308A-CN-BK* | 52U [8 ft.] |
| RRD1909A-CN-BK* | RRD2309A-CN-BK* | 58U [9 ft.] |
*Minimum order quantity required.
Ask about tapped rail versions of the part number above.
Cable Management
4-Post Open Frame Cable Management Options
Besides helping improve airflow, cooling, and maintenance efficiency, superior cable management maximizes safety and increases your equipment’s performance. Efficient cable management allows workers to quickly access cables when troubleshooting and performing basic tasks. Choosing the most practical cable management organizers and accessories significantly impacts your network’s overall performance.
Emcor Enclosures offers a comprehensive range of cable management solutions, including:
- Vertical cable management: Lacing panels and organizers with finger ducts
- Horizontal cable management: D-ring organizers, organizers with finger ducts, cable troughs, rails, lacing panels, and lacing bars
- Overhead cable management: Overhead cable trays
- Other accessories: Cable ties, holders, clips, loops, and more
FAQs
How do I choose between a 2-post and a 4-post rack?
The primary differences between 2-post and 4-post racks are structure, size, and capacity, so knowing the exact type of equipment you need to house is critical. Two-post units are economical for mounting lighter-weight equipment like hubs, shelves, patch panels, and networking gear. Four-post racks have two additional posts and feature more robust construction, making them ideal for heavier equipment.
Are there specific industry standards that 4-post open-frame racks need to meet?
Emcor’s 4-post rack servers meet EIA-310-D standards, an initiative issued by the Electronic Industries Alliance. These standards outline various terms critical in the server rack industry, including front panel width, rack openings, and vertical and horizontal hole spacing. Our 4-post racks are also UL-listed and RoHS-compliant.
What are 4-post server racks used for?
Compared to 2-post designs, 4-post racks have higher load ratings, making them better suited for heavier and larger equipment. Four-post racks offer excellent cable management and are perfect for housing heavier, more valuable items like large servers, routers, switches, and patching frames. Four-post server racks also include features that can accommodate equipment with extended depths.
What is the benefit of having a 4-post open frame rack with cable management?
The open sides of a 4-post rack are highly beneficial when installing new equipment or removing old equipment for maintenance, particularly with cable management. These racks enable you to route and organize your cables quickly and efficiently. Cable management organizers and accessories compatible with 4-post units offer increased efficiency and maximum organization.
What makes a 4-post server rack more robust than other rack designs?
The extra posts make 4-post racks much more stable than their 2-post counterparts. Four-post units also contain a durable base with holes, enabling a secure connection to the floor. Heavy-duty aluminum channels add durability.
4-Post Open Frame Racks Compatible Parts
| Select | Part Number | Description | Files | Read More |
|---|---|---|---|---|
| CMA-001-C 459281 |
Velcro Cable Ties (20 pk) Cable Manager Accessory Style C [Universal] | STP | ||
|
Files: STP Product Type Cable Managers Used Where Internal Requires Rear Attach Point No Style Accessory Material Velcro Fits Frame Depth Any Mounting Hardware Included Included - If not installed prior to shipment. Requires Paint No (Not Painted) Requires Laminate No UL Listed No RoHS Compliant Yes REACH Compliant Yes |
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| HCMC1901-BK 464062 |
1U Single Sided Horizontal Cable Manager - 19†EIA UL Listed | Includes: Metal Rings and Snap-On Hinging Cover | N/A | ||
|
Files: N/A Product Type Cable Managers Used Where Front, Rear Requires Rear Attach Point Yes Style Horizontal Single Sided EIA Width 19 U 1 Fits Frame Depth Any Mounting Hardware Included Not Included Requires Paint No (Black Only) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| HCMC1901D-BK 464063 |
1U Double Sided Horizontal Cable Manager - 19†EIA UL Listed | Includes: Metal Rings and Snap-On Hinging Cover | N/A | ||
|
Files: N/A Product Type Cable Managers Used Where Front, Rear Requires Rear Attach Point Yes Style Horizontal Double Sided EIA Width 19 U 1 Fits Frame Depth Any Mounting Hardware Included Not Included Requires Paint No (Black Only) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| HCMC1902-BK 464064 |
2U Single Sided Horizontal Cable Manager - 19†EIA UL Listed | Includes: Metal Rings and Snap-On Hinging Cover | N/A | ||
|
Files: N/A Product Type Cable Managers Used Where Front, Rear Requires Rear Attach Point Yes Style Horizontal Single Sided EIA Width 19 U 2 Fits Frame Depth Any Mounting Hardware Included Not Included Requires Paint No (Black Only) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| HCMC1902D-BK 464065 |
2U Double Sided Horizontal Cable Manager - 19†EIA UL Listed | Includes: Metal Rings and Snap-On Hinging Cover | N/A | ||
|
Files: N/A Product Type Cable Managers Used Where Front, Rear Requires Rear Attach Point Yes Style Horizontal Double Sided EIA Width 19 U 2 Fits Frame Depth Any Mounting Hardware Included Not Included Requires Paint No (Black Only) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| HW-RSL100-PURPLE 461333 |
Rackstud - Mounting Hardware Purple Color for 12 Gauge Square Rails (100 pk) | N/A | ||
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Files: N/A Product Type Hardware Requires Rear Attach Point No Style Hardware Kit Requires Paint No (Not Painted) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| HW-RSL100-RED 461332 |
Rackstud - Mounting Hardware Red Color for 14 Gauge Square Rails (100 pk) | N/A | ||
|
Files: N/A Product Type Hardware Requires Rear Attach Point No Style Hardware Kit Requires Paint No (Not Painted) Requires Laminate No UL Listed No RoHS Compliant No REACH Compliant No |
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| RRD1903A-BK 463213 |
4-Post Adjustable Depth Open Frame Rack (3') - 18U, 19" EIA HxWxD = [36.00" x 20.25" x 44.50"] [914mm x 514mm x 1130mm] Usable Depth Min/Max = [20.50" https://www.emcorenclosures.com/ 32.50"] [521mm / 826mm] Weight Capacity = [800 lbs.] [363 kg.] UL Listed | Ships Flat, Assembly Required Includes: Rack with 12-24 Tapped Rails, Extra Black Rack Screws (50 pk), Assembly Instructions | N/A | ||
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Files: N/A Product Type Open Frame Racks Requires Rear Attach Point No Style 4-Post Rack with Tapped Rails Material Aluminum Extrusion Finish Textured Powder Paint EIA Width 19 U 18 Front Flange Style 12-24 Tapped Side Flange Style No Flange Rail to Rail Depth Min 20.500" Rail to Rail Depth Max 32.500" Overall Height 36.000" Overall Width 20.250" Overall Depth 44.500" (Max) Weight Load Capacity 800 lbs. Static Load Requires Paint No (Black Only) Requires Laminate No UL Listed Yes RoHS Compliant Yes REACH Compliant No EIA Standard EIA-310-D |
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| RRD1903A-CN-BK 464072 |
4-Post Adjustable Depth Open Frame Rack (3') - 18U, 19" EIA HxWxD = [36.00" x 20.25" x 44.50"] [914mm x 514mm x 1130mm] Usable Depth Min/Max = [20.50" https://www.emcorenclosures.com/ 32.50"] [521mm / 826mm] Weight Capacity = [800 lbs.] [363 kg.] UL Listed | Ships Flat, Assembly Required Includes: Rack with Square Hole Rails, Extra Black Rack Screws and Cage Nuts (50 pk), Assembly Instructions | N/A | ||
|
Files: N/A Product Type Open Frame Racks Requires Rear Attach Point No Style 4-Post Rack with Square Hole Rails Material Aluminum Extrusion Finish Textured Powder Paint EIA Width 19 U 18 Front Flange Style Square Hole Side Flange Style No Flange Rail to Rail Depth Min 20.500" Rail to Rail Depth Max 32.500" Overall Height 36.000" Overall Width 20.250" Overall Depth 44.500" (Max) Weight Load Capacity 800 lbs. Static Load Requires Paint No (Black Only) Requires Laminate No UL Listed Yes RoHS Compliant Yes REACH Compliant No EIA Standard EIA-310-D |
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| RRD1904A-BK 463214 |
4-Post Adjustable Depth Open Frame Rack (4') - 24U, 19" EIA HxWxD = [36.00" x 20.25" x 44.50"] [914mm x 514mm x 1130mm] Usable Depth Min/Max = [20.50" https://www.emcorenclosures.com/ 32.50"] [521mm / 826mm] Weight Capacity = [800 lbs.] [363 kg.] UL Listed | Ships Flat, Assembly Required Includes: Rack with 12-24 Tapped Rails, Extra Black Rack Screws (50 pk), Assembly Instructions | N/A | ||
|
Files: N/A Product Type Open Frame Racks Requires Rear Attach Point No Style 4-Post Rack with Tapped Rails Material Aluminum Extrusion Finish Textured Powder Paint EIA Width 19 U 24 Front Flange Style 12-24 Tapped Side Flange Style No Flange Rail to Rail Depth Min 20.500" Rail to Rail Depth Max 32.500" Overall Height 48.000" Overall Width 20.250" Overall Depth 44.500" (Max) Weight Load Capacity 800 lbs. Static Load Requires Paint No (Black Only) Requires Laminate No UL Listed Yes RoHS Compliant Yes REACH Compliant No EIA Standard EIA-310-D |