Have you ever wondered whether you should install a filter in your range hood or not? While some people say that "filters make cleaning easier," others say that "they actually reduce ventilation efficiency." Many people probably find it difficult to decide which is correct.

Whether or not you have a filter changes how grease spreads, how often you need to maintain your range hood, and even how odors linger. Which option is best for your environment also depends on the type of range hood you have and your cooking style.

This article explains in detail the differences between having a filter and not having one, from the perspectives of actual usability and ease of cleaning. It also covers how to choose a filter and when to replace it, so please use it as a reference.

Is it better not to have a range hood filter? The conclusion explained.

Many people may have heard that "it's better not to have a filter." In reality, the correct answer varies depending on how you use it and your environment, so it's impossible to say which is better unequivocally.

First, let's look at what changes depending on whether or not you have a filter, and when you should decide whether or not to install one.

What changes with or without a filter

A range hood filter is a sheet installed at the intake of the range hood to catch grease and dust. Installing a filter prevents oil from directly entering the internal fan and ductwork. On the other hand, if the filter becomes clogged, it can reduce ventilation efficiency.

Without a filter, the airflow is smoother, but grease tends to accumulate inside the range hood. Both methods have trade-offs, so it's important to understand "what changes with or without a filter" before making a choice.

Criteria for deciding whether to install a filter or not

Whether you should install a filter or not mainly depends on your "cooking frequency," "type of range hood," and "time you can dedicate to cleaning."

For households that frequently cook oily foods like deep-frying or stir-frying, a filter helps prevent oil from entering the interior. On the other hand, if you cook infrequently, or if you have a range hood with a rectifier plate (seiryuban) that is designed to be less prone to getting dirty inside, you may not have a problem without a filter.

Even if you install a filter, if you don't replace it regularly, ventilation efficiency will decrease. It's not enough to simply think "I'm safe if I have a filter"; whether you can consistently replace it frequently is also a key factor in your decision.

Reasons why it's said that it's better not to use a range hood filter

There are several specific reasons behind the idea that "it's better not to use a filter." Knowing these reasons will make it easier for you to make a decision based on your own circumstances.

Risk of reduced ventilation efficiency

Installing a filter adds an extra sheet to the airflow path, which can sometimes reduce ventilation. In particular, a filter left clogged will significantly impair ventilation efficiency.

If ventilation is insufficient, smoke and steam generated during cooking are more likely to linger in the kitchen. This can lead to problems such as grease spreading to walls and ceilings, or odors remaining in the room, so caution is advised. The problem is not installing a filter itself, but rather the condition of "leaving it installed without replacement" that most often leads to reduced ventilation efficiency.

Cases where no filter is needed

Depending on the type of range hood, some models are designed to be less prone to internal dirt accumulation even without a filter. A typical example is a range hood with a rectifier plate. A rectifier plate is a plate-shaped part installed at the suction port, which serves to regulate the airflow and catch oil. This type is originally designed not to require a filter, so forcing one on can sometimes reduce ventilation efficiency.

Also, for single-person households with low cooking frequency, or in environments where microwave cooking or steaming is the main cooking method and oil is rarely used, dirt may not accumulate easily even without a filter, and simply wiping down the main unit may be sufficient.

Difference from manufacturer's recommended style

Some information suggesting "it's better not to use a filter" stems from the fact that manufacturers do not recommend using commercially available filters. This is believed to be due to concerns about the impact on ventilation performance, from the perspective of safety and liability, and the possibility that ventilation volume may fall below design specifications when non-genuine filters are used.

However, this is merely a statement from the manufacturer's standpoint, and it is generally believed that problems are unlikely to occur if a filter of appropriate size and material is correctly installed and regularly replaced. It is important to check the manufacturer's warnings and choose a filter that is suitable for your range hood.

Advantages and disadvantages of installing a range hood filter

While installing a filter has clear advantages, there are also disadvantages to be aware of. Understanding both sides will help you make a choice you won't regret.

Grease is caught by the filter.

One of the major benefits of installing a filter is that it can, to some extent, prevent grease from entering the interior of the range hood. The presence of a filter helps reduce the adhesion of oil to the fan and ductwork, making it easier to reduce the frequency of main unit cleaning.

Thorough cleaning of the inside of a range hood is a laborious task, and the grease on the fan in particular can be difficult to remove. Catching some of the dirt with a filter helps reduce the burden of long-term maintenance. Since all you have to do is replace the filter when it gets dirty, it's an easy option for those who find frequent cleaning difficult.

Reduced ventilation efficiency and replacement cost burden

On the other hand, a disadvantage of installing a filter is that it creates air resistance, which to some extent reduces ventilation efficiency. Additionally, filters require regular replacement, resulting in ongoing costs for replacement filters.

From a maintenance perspective, if replacement is neglected, clogging will worsen and ventilation will significantly decrease, requiring regular checks. If you simply assume "everything will be fine with a filter" and neglect it, ventilation efficiency can actually deteriorate, so it's important not to leave it in place.

When to replace/clean a filter if installed

Even if you have a filter installed, if you don't replace or clean it at the appropriate times, ventilation efficiency will decrease. Knowing when to replace it and how to care for it daily will help you get the most out of your filter.

How to determine when to replace the filter

The timing for filter replacement varies depending on the usage environment, but it is generally recommended every 1 to 3 months. For households that frequently deep-fry or stir-fry, where dirt accumulates faster, it is safer to check the condition every month.

Here are some changes that indicate it's time for replacement:

• The filter color has changed to yellow-brown.
• Oil has spread across the entire filter and feels sticky to the touch.
• Even when the range hood is on, smoke and odors seem to linger more than before.
• When holding the filter up to the light, it looks dark due to clogging.

If you notice any of these changes, it's a sign that ventilation efficiency is decreasing. Even if you think "it can still be used," a dirty filter can sometimes let oil through, so early replacement also helps keep the interior clean.

Tips to make filter cleaning easier

To maintain filter replacement and management for a long time, it is important to devise ways to reduce the effort as much as possible.

First, keeping a stock of replacement filters allows you to replace them immediately when you notice they are dirty. To avoid situations where you put off replacing them because "it's a hassle to go buy them," it's recommended to buy in bulk.

Also, using a filter with a dedicated mounting frame type makes the process simple, as you only need to fit the filter into the frame when replacing it, eliminating the need to re-tape it. Making replacement easy makes it easier to change at the appropriate time, helping to maintain good ventilation.

Setting a "filter check date" on your calendar or smartphone reminder is also a practical way to ensure you don't forget to replace it.

If you're unsure about choosing a filter, the "Air King" starter set is recommended.

If you've decided to install a filter but are unsure which one to choose, we recommend the range hood filters from the specialty filter store, Kuki no Ōsama (Air King). They offer a dedicated mounting frame and filter as a set, making it easy for first-time users to get started right away.

Features of Air King's Range Hood Filters

Air King filters have the following features:

• Perfect fit with dedicated mounting frame: The frame is designed to fit the size of your range hood perfectly, ensuring the filter stays securely in place without shifting or leaving gaps.
• Made in Japan non-woven fabric material: Soft non-woven fabric material that is safe to touch with bare hands. It effectively catches grease while being easy to handle.
• Easy installation with no cutting required: No need to cut to size; simply set it in the frame and installation is complete.
• Free shipping nationwide (excluding Hokkaido and Okinawa): Delivered by Yamato Transport. Date and time specification also available at no additional charge.

Contents of the starter set for first-time users

For those introducing a filter for the first time, a starter set is available that includes a dedicated mounting frame and replacement filters. The advantage is that you don't need to prepare a mounting frame separately, and you can install it as soon as it arrives.

Even if you don't know the size, you can use the mounting frame search function on the website to find compatible frames based on your range hood's size. If you're worried about finding a filter that fits your range hood, start by measuring its size.

▶ View Range Hood Filter Starter Sets

Frequently Asked Questions about Range Hood Filters

When researching filters, you may often wonder, "What's the right answer in the end?" We've compiled some frequently asked questions, so please refer to them.

Are range hood filters necessary?

Whether a filter is necessary depends on the type of range hood you use and your cooking style. Range hoods with rectifier plates are designed to be filter-free, so not installing one can actually allow them to perform at their full ventilation capacity. On the other hand, for range hoods with exposed propeller fans or sirocco fans, a filter can help reduce the amount of oil entering the interior, making cleaning easier.

For households that frequently deep-fry or stir-fry, a filter is recommended to catch grease and help keep the range hood clean for longer. If you cook infrequently or rarely use oil in your cooking, a filter may not be necessary.

What happens to grease stains without a filter?

If you continue to cook without a filter, grease fumes will enter the range hood directly, accumulating as grease on the fan, inner walls, and ductwork. Over time, grease oxidizes and hardens, becoming stickier, so the longer it's left, the harder it is to clean.

Furthermore, accumulated grease can cause odors, sometimes leaving a greasy smell in the kitchen even when not cooking. If you use it without a filter, making it a habit to wipe down the unit monthly and clean the fan once or twice a year can help prevent grease accumulation.

Can I use a range hood without a filter in a rental property?

For range hoods in rental properties, there's no problem if the dirt is deemed "within the normal range of use" upon moving out. However, if there's discoloration or lingering odors caused by grease, you might be charged a cleaning fee.

If you use it without a filter, it's especially important to diligently wipe down the interior to prevent dirt from accumulating. On the other hand, installing a filter and replacing it regularly can, to some extent, prevent oil from entering the interior, which can help reduce potential issues when moving out. Introducing easy-to-manage replaceable filters is one recommended method for those living in rental properties.

Summary | Should you install a range hood filter? Choose what's right for you.

The decision of whether or not to install a range hood filter depends on the type of range hood, cooking frequency, and your approach to cleaning. While it may be fine not to have a filter for range hoods with rectifier plates or if you cook infrequently, for households that frequently use oil, a filter can help reduce the burden of cleaning by, to some extent, preventing dirt from entering the interior.

If you decide to install a filter, two particularly important points are whether it "fits correctly" and whether you can "replace it at the appropriate times." Choosing a filter with a dedicated mounting frame will prevent shifting and gaps, and make replacement easy to continue.

If you're unsure about choosing a filter, please refer to Air King's range hood filters. They offer a set that includes a dedicated mounting frame sized for your range hood and a Made-in-Japan non-woven fabric filter, making it easy for first-time users to install and continue replacing.

Keep your kitchen clean with a filter that perfectly matches your range hood.