Dometic RM2354, RM2454, RM2554 & RM2620 Fridge Sizes for 12V Upgrades
Not every Dometic absorption refrigerator has a modern 12V replacement that slides into the same opening. The compact RM models are especially varied. This reference organizes original cabinet dimensions, shows where a newer compressor refrigerator may be worth measuring, and makes clear where the enclosure must change.
Original Dometic RM refrigerator cabinet sizes
These older gas/electric models range from less than 30 inches to more than 55 inches tall. The first six rows are from Dometic's installation chart, and each model is kept separate from newer DM/DMC compressor models.
| Original Dometic models | Height (in.) | Width (in.) | Depth (in.) | 12V replacement planning |
|---|---|---|---|---|
| Dometic RM2351 / RM2354 | 29-3/4 | 20-1/2 | 21-1/2 | Short, narrow single-door opening; the N2175 is much taller and is not a same-opening replacement. |
| Dometic RM2410 | 32-7/16 | 21-13/16 | 24-7/32 | A 12V replacement must be researched independently; do not select a 53-inch unit on cubic-foot rating alone. |
| Dometic RM2451 / RM2454 | 36-1/2 | 23-11/16 | 24 | N2090 is taller than this opening and would require cabinet enlargement; no direct 12V match established. |
| Dometic RM2510 | 40-5/16 | 21-13/16 | 24-7/32 | Narrow 12V refrigerators exist, but they leave substantial width to frame and secure. |
| Dometic RM2551 / RM2554 | 42-5/8 | 23-11/16 | 24 | A smaller 12V unit may need substantial finishing work; fit, restraint and air circulation remain unresolved. |
| Dometic RM2620 | 49-17/32 | 21-13/16 | 24-7/32 | The Norcold N2175 is dimensionally smaller in all three directions: a custom-cabinet candidate, not a drop-in. |
| Dometic RM2820 | 55-7/16 | 23-11/16 | 24 | A Norcold N8DC is shorter and slightly narrower than this recess; check mounting and how the height difference will be finished. |
For the taller Dometic DM2652 and DM2852 families, see our separate 53- and 60-inch comparison. Optional cooling fans may require more enclosure depth in certain absorption models.
Example: RM2620 opening compared with a Norcold N2175
The RM2620 is unusual because a 12V N2175 has dimensions close enough to make a custom-fit investigation worthwhile. Its listed enclosure is a little smaller in every direction, but a smaller body still needs secure mounting, correct ventilation and finished cabinet edges.
49-17/32 in. high × 21-13/16 in. wide
49-13/64 in. high × 20-45/64 in. wide
Original, illustrative front-view outlines; not to scale. The dimensions next to the drawings are the measurements to use.
Measured against the published RM2620 recess, the N2175 enclosure is approximately 0.33 inch shorter, 1.11 inches narrower and 0.52 inch shallower. Those are size differences only. They do not account for door swing, body-to-door projection, front trim, support, electrical routing or the removal of LP-gas services.
Other 12V refrigerators: compare openings before ordering
| 12V refrigerator model | Published enclosure / cutout (H × W × D), in. | Assessment |
|---|---|---|
| Norcold N2175BPR / N2175BPL | 49-13/64 × 20-45/64 × 23-45/64 | Smaller than RM2620 in height, width and depth; needs model-specific installation and cabinet finishing. |
| Norcold N8DC family | 52.88–53.01 × 23.50–23.63 × 24.00 | For taller, wider openings only; shorter than an RM2820 opening. Not for RM2454, RM2554 or RM2620 without significant enlargement. |
| Norcold N2090 (older 12V reference) | 38.7 × 16.5 × 19.9 (approx.) | Not a drop-in for RM2454: opening must be made taller. Historical reference only; verify model availability and revision. |
Shop complete 12V refrigerators for a measured installation
The following NewRVParts products are listed as complete refrigerators. The first two are N2175 variants worth comparing to a measured RM2620 cabinet; the N8DC is for taller, wider cabinets rather than the compact models listed above.
Norcold N2175BPR6.2-cu.-ft. class | right-hinge 12V | bottom freezerView refrigerator & availability ›
Norcold N2175BPL6.2-cu.-ft. class | left-hinge 12V | bottom freezerView refrigerator & availability ›
Norcold N8DCSSR8-cu.-ft. class | 12V DC | right-hinge stainless finishView refrigerator & availability ›
What to check before modifying an older RV fridge cabinet
- Verify the actual clear opening at the narrowest points, including obstructions at the back and floor.
- Measure the replacement refrigerator outside the cabinet, including door projection and any required trim; check the route through the RV entrance.
- Do not assume old absorption sidewall/roof vents are correct for a compressor refrigerator. Use the replacement manufacturer's ventilation plan.
- Have the propane line safely isolated by a qualified installer and confirm a properly fused and sized 12V circuit. Old 12V absorption controls are not a substitute for that check.
- Confirm supplied door panels and which side the hinges are fitted on the exact orderable model.
Continue with our RV refrigerator opening measurement worksheet and the broader Norcold and Dometic 12V size chart. For repair rather than conversion, search our Dometic parts diagrams by model.
Manufacturer dimensional references
Dometic 2019 RM/DM installation manual, Appendix A, enclosure dimensions; Thetford/Norcold N2000-series manufacturer product catalogue (archived copy); N8DC/N10DC service manual; N2000 service manual (2025).
Repair the original refrigerator: illustrated parts diagrams
If you are keeping the existing refrigerator, choose its full model and, where available, its exact product number to view numbered component drawings and matching NewRVParts parts. These are repair references, not confirmation that a complete 12V replacement fits the cabinet.
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