NEC NJ27422 Projector Air Filter for CP-RX79, CP-RX82, ED-X26 – OEM Replacement

NJ27422 is the OEM air filter model used in NEC projectors and is compatible with 3 models. This guide presents the filter specifications, replacement indicators, model compatibility list, and key checks to perform before replacement in one place.

I. Air Filter Specifications

The matching lamp module model DT01151 is the OEM lamp module model for the same projector model as this filter. It is used to cross-check the projector generation and is not a random pairing.

The above specifications are taken from the Zorsika product database. Confirm the dimensions and clip design against the actual product and OEM part number.

II. When It Should Be Replaced and Whether It Can Be Washed

An air filter is a consumable, but its deterioration produces no obvious warning and is often noticed only incidentally. If any of the following signs appears, inspect the filter:

• The image is noticeably dimmer and the colors look dull: A blocked intake raises the internal temperature, causing the projector to automatically reduce its power output to protect itself. The result appears to be a drop in brightness.
• The projector frequently displays temperature or filter warnings: Most models have a filter service timer and automatically display a message when the interval is reached. Even without a message, a fan that continuously runs at high speed and produces more noise generally indicates an obstructed airflow path.
• The filter is blackened and opaque when held against the light: Remove it and inspect it against a light source. If light transmission has clearly deteriorated or the surface is clogged, cleaning is unlikely to restore it, and it should be replaced.

Cleaning Guidelines

Light dust buildup can be cleaned off: first remove loose dust with a soft-bristled brush or low-pressure air, then backflush it with clean water from the outlet side. Let it air-dry completely until it no longer drips before reinstalling it. Three cautions: do not scrub the filter media forcefully, do not use cleaning agents, and do not install it while wet. Once the filter media has been loosened or torn, enlarged pores make it ineffective, allowing dust to enter the optical path directly.

The environment determines the replacement frequency. Classrooms, construction sites, and street-facing showrooms typically have higher dust levels and require noticeably shorter inspection intervals, while temperature- and humidity-controlled meeting rooms can allow longer intervals. Rather than following a fixed schedule, check light transmission whenever you clean the projector; the filter’s actual condition is a more reliable guide.

III. Compatible Projector Models (3 Models, NEC)

The following NEC projector models have been verified as compatible with NJ27422:

CP-RX79，CP-RX82，ED-X26

This list contains verified models and is not exhaustive. Projectors from the same generation often share filters of the same specification. For a model not listed, send us photos of the projector nameplate and the original filter so we can confirm compatibility.

IV. Three Checks Before Replacement

1. Verify the model: The OEM part number should match NJ27422. Some NEC projector models use different filter configurations with the same chassis, and filters with different part numbers are not interchangeable.
2. Verify the dimensions and thickness: A difference of just one or two millimeters in length or width may prevent a proper seal. A filter that is too thick prevents the cover from closing, while one that is too thin lets air leak through. Measure the original filter rather than ordering solely by projector model name.
3. Determine whether it is a standalone filter or comes with a frame: Some models use filters with a plastic frame or clips, while others use plain filter media that must be fitted into the existing frame. Purchasing the wrong format will make it impossible to install. Taking a photo during disassembly is the safest way to verify.

V. Choosing Between Zorsika, the OEM Part, and Other Alternatives

Zorsika projector air filters are manufactured to the OEM filter media specifications. Pore size, thickness, and air resistance are individually matched to the OEM benchmarks, while dimensions and clips are custom-tooled to match the OEM design, providing a tight fit that prevents dust ingress.

The OEM part is the most dependable option, but it comes at a higher overall cost and its lead time depends on the supply channel. Common problems with low-cost alternatives include uneven pore sizes and poor corner fit. Once installed, such filters either let dust through or restrict airflow. If dust enters the optical path, the replacement costs ultimately fall on the lamp and LCD panel.

VI. Frequently Asked Questions

Question: My projector is not among the 3 models listed above. Can I use NJ27422?

Answer: The list contains models that have been verified and is not exhaustive. NEC projectors of the same generation often share filters with identical specifications. Send the projector nameplate and a photo of the old filter to the Zorsika technical team, who can help confirm whether it is compatible.

Question: How often should a projector air filter be replaced?

Answer: There is no fixed number of months; it depends on the dust concentration in the environment and the projector’s operating hours. Use the filter’s actual condition as the criterion: replace it when light transmission has clearly deteriorated, the surface is clogged, the image has become dim, or the projector displays a filter warning. Shorten the inspection interval in dusty environments.

Question: Can the air filter be washed with water and reused?

Answer: Light dust buildup can be cleaned off: remove loose dust with a soft-bristled brush or low-pressure air, backflush it with clean water from the outlet side, and reinstall it only after it has dried completely in the shade. Do not scrub the filter media, use cleaning agents, or install it while wet. If the filter media has already been loosened, damaged, or clogged, cleaning cannot restore it, and it must be replaced.

Question: Can the air filter be omitted during installation?

Answer: No. The filter blocks dust. Once dust enters the optical path, it can settle on the LCD panel and color wheel, causing permanent dark spots and color spots. Cleaning requires disassembly and costs far more than the filter itself.

Question: Why choose a Zorsika air filter instead of a cheaper one?

Answer: Zorsika projector air filters are manufactured to OEM filter media specifications, with pore size and air resistance parameters that match the original parts, and every batch undergoes pressure-drop testing before shipment. Compared with the OEM part, they offer more stable supply and better overall value; compared with other alternatives, they provide dependable filtration precision and fit.

Question: How do I choose between the OEM part, Zorsika, and other alternatives?

Answer: The key to selecting an air filter is balancing filtration precision and air resistance. Zorsika projector air filters (see the model in the specifications table above) use OEM-equivalent filter media, with pore size, thickness, and air resistance individually matched to the OEM specifications, ensuring both effective dust protection and adequate airflow. Other alternative filters often have uneven pore sizes and do not fit neatly at the corners; once installed, they either let dust through or restrict airflow, resulting in greater lamp consumption over time. Choose Zorsika for peace of mind and savings.

Related Resources

• Zorsika Technical Support Center
• Projector Brand and Compatible Model Search
• Projector Lamp / Lens / Air Filter Product Database