Mitsubishi E85R Air Purifier: Specs and Upkeep

The Mitsubishi E85R air purifier is a compact, wall-mountable unit designed for single-room use, with a Clean Air Delivery Rate (CADR) of approximately 85 cubic feet per minute (CFM) for smoke, dust, and pollen. Its upkeep centers on washing the pre-filter monthly and replacing the main HEPA-type filter every 1–2 years, depending on usage. This article explains what those specifications actually mean for your room, your health, and your maintenance routine.

Formula

The key metric for any air purifier is air changes per hour (ACH), which tells you how many times the purifier can cycle the entire volume of air in a room in one hour. The formula is:

ACH = (CADR × 60) ÷ (Room Volume)

• CADR = Clean Air Delivery Rate in cubic feet per minute (CFM) – for the E85R, this is 85 CFM.
• 60 = conversion factor from minutes to hours.
• Room Volume = length × width × height in cubic feet (ft³).

For metric users, 1 CFM ≈ 1.699 m³/h, so the E85R delivers roughly 144 m³/h.

Worked Example

Using the default room size from the calculator above (12 ft × 10 ft × 8 ft):

1. Room Volume = 12 × 10 × 8 = 960 ft³
2. CADR in ft³/min = 85 CFM
3. Air volume cleaned per hour = 85 × 60 = 5,100 ft³/h
4. ACH = 5,100 ÷ 960 ≈ 5.3 air changes per hour

This means the E85R will clean the air in that room about 5 times every hour, which is considered good for allergy and dust control (4+ ACH is recommended for allergy sufferers). For a larger room, say 15 ft × 12 ft × 9 ft (1,620 ft³), the ACH drops to about 3.1, which is still acceptable but less effective for strong pollutants like smoke.

What the Specs Actually Mean

The E85R’s CADR of 85 CFM is on the lower end for room air purifiers. It is designed for small spaces—typically bedrooms, offices, or nurseries up to about 100 square feet (9.3 m²). The unit uses a two-stage filtration system:

• Pre-filter: A washable mesh that captures large particles like pet hair and dust bunnies.
• Main filter: A HEPA-type filter (often labeled as “HEPA-typeâ€� rather than true HEPA) that captures 0.3-micron particles like pollen, mold spores, and fine dust.

The E85R does not have an activated carbon filter, so it is not effective at removing odors, VOCs, or smoke gases—only particulate matter. If you need odor control, you would need a different model or an additional carbon filter.

Upkeep: What You Need to Do and When

Proper maintenance is essential to keep the E85R working at its rated CADR. Neglect will reduce airflow and filtration efficiency over time.

1. Pre-filter cleaning: Vacuum or rinse the pre-filter every 2–4 weeks, depending on dust levels. Let it dry completely before reinstalling.
2. Main filter replacement: Replace the main filter every 12–24 months. The exact interval depends on usage hours and air quality. Some users replace it yearly if they run the unit 24/7 in a dusty home.
3. Exterior and vent cleaning: Wipe the unit’s exterior and check the air outlet for dust buildup monthly.
4. Check filter indicator: Many Mitsubishi units have a filter replacement light or timer. When it illuminates, it is time to replace the filter.

Replacement filters are widely available online and from appliance parts dealers. Always use the manufacturer’s specified filter—using a generic one may affect performance and fit.

Common Mistakes and Misconceptions

• “HEPA-typeâ€� vs. “True HEPAâ€�: The E85R’s filter may be labeled “HEPA-type,â€� which is not the same as true HEPA. True HEPA must capture 99.97% of particles at 0.3 microns. HEPA-type filters often capture around 95–99% at that size. For most allergy sufferers, this is still effective, but it is not laboratory-grade.
• Running it only when you’re home: Air purifiers work best when run continuously. Turning it off at night allows allergens to build up.
• Placing it in a corner: The unit needs airflow on all sides. Place it at least 1–2 feet away from walls and furniture.
• Forgetting to wash the pre-filter: A clogged pre-filter reduces airflow and forces the main filter to work harder, shortening its life.

How to Choose the Right Size Purifier

To decide if the E85R is right for your room, use the calculator above. A general rule of thumb:

• 4 ACH or more: Good for allergy and asthma control.
• 2–4 ACH: Acceptable for general dust and pet dander.
• Less than 2 ACH: Not effective for most air quality concerns.

For a room larger than about 120 square feet, you would need a higher-CADR unit (150–300 CFM) to achieve the same ACH. The E85R is best suited for small bedrooms, home offices, or personal spaces.

Safety and Operational Notes

• The E85R is designed for indoor use only. Do not expose it to rain or moisture.
• Unplug the unit before cleaning or replacing filters.
• Do not block the air intake or outlet—this can cause overheating.
• If the unit makes unusual noises or emits a burning smell, turn it off and unplug it immediately.
• Keep the unit away from heat sources and flammable materials.

Frequently Asked Questions

How often should I replace the filter on my Mitsubishi E85R?

Typically every 12 to 24 months. If you run the unit 24/7 in a dusty environment, replace it annually. If you run it only a few hours a day in a clean room, you might stretch it to 2 years. Always check the filter indicator light if your model has one.

Can I wash the HEPA filter?

No. The main HEPA-type filter is not washable. Washing it will damage the fibers and ruin its filtration ability. Only the pre-filter is washable.

Does the E85R remove smoke odors?

No. The E85R does not have an activated carbon layer, so it will not remove gaseous odors or smoke chemicals. It will capture smoke particles, but the smell will linger. For odor removal, you need a purifier with a carbon filter.

What room size is the E85R good for?

It is designed for rooms up to about 100 square feet (9.3 m²) with an 8-foot ceiling. That gives roughly 4 air changes per hour. For larger rooms, you would need a higher-CADR unit.

Is the E85R a true HEPA purifier?

It uses a “HEPA-type� filter, which is not the same as true HEPA. True HEPA captures 99.97% of 0.3-micron particles; HEPA-type typically captures 95–99%. For most residential uses, this is still effective, but if you have severe allergies, you may want a true HEPA model.

Can I run the E85R all day?

Yes, it is safe to run continuously. In fact, running it 24/7 is recommended for best air quality. The unit is designed for continuous operation, and the motor is rated for long life.

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in t | Room length | ft | 12 | 0
in w | Room width | ft | 10 | 0
in h | Room height | ft | 8 | 0
out ach | Air changes per hour | - | (t * w * h * 60) / (85 * 60) | 1
out cadr_m3h | CADR in m³/h | m³/h | 85 * 1.699 | 1