NEC NJ20922 OEM Projector Air Filter: PJ-LC7 CP-RS55 CP-RS56 HCP-HX992 HCP-HS985 HCP-HX995 HCP-HS982

NJ20922 is the OEM air filter model used in NEC projectors and supports 20 models. This article presents its specifications, replacement indicators, model compatibility list, and pre-installation checks in one place.

I. Air Filter Specifications

The matching lamp module models DT00701,DT00707 are OEM lamp module models used with projectors compatible with this filter. They serve as a cross-check for the projector generation and are not random pairings.

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

II. When to Replace It and Whether It Can Be Washed

An air filter is a consumable, but its deterioration produces no obvious sound and is usually noticed only when the filter has already been affected. If any of the following signs appears, inspect the filter:

• The image is noticeably dimmer and colors appear dull: Blocked intake airflow raises the internal temperature, causing the projector to reduce power automatically to protect itself. The visible result is a drop in brightness.
• The projector frequently displays temperature or filter warnings: Most models have a filter timer and show a prompt when the service interval expires. Even without a prompt, if the fan continuously runs at high speed or produces more noise, the air path is generally obstructed.
• The filter is blackened and no longer transmits light: Remove it and inspect it against a light source. If light transmission has clearly declined or dust has formed clumps on the surface, washing is unlikely to restore it, and the filter should be replaced.

Cleaning Guidelines

Light dust buildup can be cleaned: first remove loose dust with a soft-bristled brush or low-pressure air blower, then rinse it in clean water from the exhaust side in the reverse direction. Allow it to air-dry completely until it no longer drips before reinstalling it. Follow three precautions: do not rub the filter media vigorously, do not use cleaning agents, and never reinstall it while wet. Once the filter media has been loosened by rubbing or damaged by washing, its pores become larger, effectively making the filter useless and allowing dust to enter the optical path directly.

Environmental conditions determine replacement frequency. Inspection intervals should be significantly shortened in dusty environments such as classrooms, construction sites, and street-facing showrooms; they can be extended for temperature- and humidity-controlled meeting rooms. Rather than relying on a fixed schedule, check light transmission each time the filter is serviced. Its actual condition provides a more reliable basis for deciding when to replace it.

III. Compatible Models (20 Models, NEC)

The following are the NEC projector models verified as compatible with NJ20922:

PJ-LC7，CP-RS55，CP-RS56，HCP-HX992，HCP-HS985，HCP-HX995，HCP-HS982，HCP-HX982，HCP-HS980，HCP-HX980，HCP-HX990，HCP-35，HCP-35S，HCP-35X，CP-RX61，CP-RS57，CP-RX60，PJ-LC9，PJ-LC9W，ED-PJ32

This list contains verified models and does not represent the complete range. Projectors from the same generation often share the same filter specification. For models not listed, send us a photo of the nameplate and the original filter for compatibility confirmation.

IV. Three Checks Before Replacement

1. Verify the model: The OEM part number should match NJ20922. 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 one or two millimeters in length or width may prevent the filter from sealing properly. If it is too thick, the cover will not close; if it is too thin, air will leak around it. Use measurements taken from the original filter as the standard, and do not order solely by model name.
3. Determine whether it is a standalone filter or a framed assembly: Some models use filters with a plastic frame or clips, while others use bare filter media that must be installed in the existing frame. Purchasing the wrong configuration will prevent installation, so taking a photo during disassembly is the safest way to confirm it.

V. Choosing Between Zorsika, OEM, and Other Alternative Filters

Zorsika projector air filters are manufactured to OEM filter media specifications, with pore size, thickness, and airflow resistance matched item by item. Their dimensions and clips are molded to OEM specifications, allowing a secure fit that prevents dust from entering.

OEM parts offer the greatest reliability, but their total cost is high and lead times depend on the distribution channel. Common problems with low-cost alternatives include uneven pore sizes and poor fit at the corners. Once installed, they either let dust through or restrict airflow. If dust enters the optical path, the lamp and LCD panel ultimately bear the consequences.

VI. Frequently Asked Questions

Q: My projector is not among the 20 models listed. Can it use NJ20922?

A: The list contains verified models and does not represent the complete range. NEC products from the same generation often share the same filter specification. Send the projector nameplate and a photo of the original filter to Zorsika Technical Support, and we can help determine whether it is compatible.

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

A: There is no fixed number of months. Replacement frequency depends on the dust concentration in the environment and the projector's operating hours. Use the actual condition as the basis for replacement: replace the filter when light transmission has clearly declined, clumps have formed on the surface, the image has become dimmer, or the projector displays a filter warning. Shorten inspection intervals in dusty environments.

Q: Can the air filter be washed in water and reused?

A: Light dust buildup can be cleaned: remove loose dust with a soft-bristled brush or low-pressure air blower, rinse it in clean water from the exhaust side in the reverse direction, and reinstall it only after it has dried completely. Do not rub the filter media vigorously, do not use cleaning agents, and never reinstall it while wet. If the filter media has already been loosened, damaged, or clumped, cleaning will not restore it, and it must be replaced.

Q: Can the air filter be omitted during installation?

A: 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 defects. Cleaning requires projector disassembly and costs far more than the filter itself.

Q: Why choose a Zorsika air filter instead of a cheaper option?

A: Zorsika air filters are manufactured to OEM filter media specifications, with pore size and airflow resistance matching the original parameters, and each batch undergoes pressure-drop testing before shipment. Compared with OEM filters, Zorsika provides stable supply and better overall value. Compared with other alternatives, it ensures reliable filtration precision and fit.

Q: How should I choose between OEM, Zorsika, and other alternative filters?

A: The key to an air filter is balancing filtration precision and airflow resistance. Zorsika air filters (see the model in the specifications table above) use filter media with the same specifications as the OEM product, with pore size, thickness, and airflow resistance matched item by item to ensure both dust protection and adequate airflow. Other alternative filters often have uneven pore sizes and poor fit at the corners. Once installed, they either let dust through or restrict airflow, resulting in greater long-term lamp consumption. Choosing Zorsika saves both time and money.

Related Search Links

• Zorsika Technical Support Center
• Projector Brand and Model Compatibility Lookup
• Projector Lamp / Lens / Air Filter Product Catalog