Identify RV Designer Rectangular Vent Registers by Size & MPN
When identifying an RV heating or cooling register, the front face can be misleading: the visible dimensions may be larger than the cutout beneath. These nine RV Designer models vary in size, colour and material, and all have adjustable dampers. Match the original part and installation opening rather than appearance alone.
Use the visible face to narrow down the number
10 × 2¼ in plastic
H841 (black), H851 (white) and H861 (tan) share the listed slim face dimensions. All have a damper; check the actual mounting opening.
10 × 4 and 8 × 4 in metal
H874/H876 are the wider 10 × 4 in models; H871/H873 are 8 × 4 in. Compare finish and size before replacing one.
12 × 3½ in thermoplastic
H850 (white) and H860 (tan) have a 12 × 3½ in outer face and a manufacturer-listed 10 × 2⅜ in opening. The face size is not the cutout.
Adjustable dampers
The nine products in this comparison have dampers. Match the opening dimensions and airflow path; a vent cover without a damper is not equivalent.
Cross-reference the manufacturer number
| MPN | Listed face size | Material | Colour | Damper |
|---|---|---|---|---|
| H841 | 10 × 2¼ in | Plastic | Black | Yes |
| H851 | 10 × 2¼ in | Plastic | White | Yes |
| H861 | 10 × 2¼ in | Plastic | Tan | Yes |
| H874 | 10 × 4 in | Metal | Tan | Yes |
| H876 | 10 × 4 in | Metal | White | Yes |
| H850 | 12 × 3½ in | Thermoplastic | White | Yes |
| H860 | 12 × 3½ in | Thermoplastic | Tan | Yes |
| H871 | 8 × 4 in | Metal | Tan | Yes |
| H873 | 8 × 4 in | Metal | White | Yes |
Measure the opening, not just the face. H850 and H860 have a 12 × 3½ in outer face with a 10 × 2⅜ in mounting cutout. For other models, confirm the exact manufacturer's cutout specification or measure the existing opening before purchase. The face sizes in this chart are not guaranteed hole dimensions.
Identify the original register before replacing it
- Locate the RV Designer MPN, if readable, then measure the outside face and the actual opening behind it separately.
- Compare colour, material and damper operation. Similar rectangular faces can have different cutouts, fastener spacing or depth.
- For H850 and H860, distinguish the 12 × 3½ in face from the 10 × 2⅜ in opening.
- Inspect the frame, louvers, damper movement and mounting holes for cracks, corrosion or deformation.
- Review the individual listing for actual condition and pieces included. Viewing and pickup at UsedRVParts in Kelowna are by appointment.
Locate an exact RV Designer number
Check the individual item listing for condition, colour and dimensions.
More RV ventilation parts
For different vent styles, see our B&B Molders floor registers and return-air grilles and CoolVent ceiling outlets.
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