A room air purifier is used to clean the air in an entire room, whereas a laminar air purifier directs a soft, constant flow of clean filtered air to the user’s face. Room air purifiers can be used to clean the air in spaces that you have control over (such as your home or office), while you can use a laminar air purifier to reduce your exposure to contaminants such as virus and allergens when visiting places that you have no control over (such as a restaurant or airplane). It’s possible to use both types of devices at the same time.

Both kinds of air purifiers use the same underlying materials (fans and HEPA filters), but they are engineered differently.

A room air purifier’s airflow is turbulent as air is pushed through the filter by the fan, causing turbulent flow that mixes filtered and unfiltered air from the surroundings, as particles move in a very chaotic pattern. Since the purpose of a room air purifier is to clean an entire room’s air, turbulent flow is not a problem, since clean air will be dispersed and distributed throughout the room over time.

A laminar air purifier’s airflow is is pulled through the filter by the fan, creating a laminar flow that has a very high concentration of filtered air, and a very low concentration of unfiltered area as air particles in the laminar flow move in a straight line.

The goal of a laminar air purifier is to provide the user with clean air in their breathing space (the area in front of their face) in 10 seconds or less. Turbulent flow, through its chaotic movements, would entrap far more unfiltered air from the surroundings as compared to laminar flow. That’s why laminar flow is extremely important if the goal is to deliver as much filtered air as possible.

More information can be found in our article here.

The decision to use H11 filters was an engineering decision. A few different types of filters were tested against each other to see which would provide the best performance – MERV-13 (>75% filtration efficiency), H11 (>95% filtration efficiency), and H12 (>99% filtration efficiency).

Filters are rated based on their filtration efficiency against particles at 0.3 microns (aka most penetrating particle size), because compared to particles smaller (under 0.3 microns) and particles larger (above 0.3 microns) than them, they are the hardest to capture.

However, filtration efficiency is just one part of the equation. Filters with higher filtration efficiency have higher pressure drop, which negatively impacts air flow. This means that for a H13 filter to achieve the same Clean Air Delivery Rate (CADR) as a H11 filter, the fan needs to operate at a faster speed, increasing energy consumption and noise level.

On the other hand, MERV-13 filters clean only 75% of the air that passes through the filter, which is significantly lower than the filtration efficiency of a H11 filter. So even if both filters have the same air flow, the H11 filter will have a higher CADR than the MERV-13 filer.

According to the manufacturer’s internal test results, both MERV-13 and H13 filters, which have 75% and 99% filtration efficiency respectively, generated 10 to 20% lower CADR than H11 filters. This goes to show that filters with lower air resistance, as well as filters with high filtration efficiency, do not necessarily perform better than H11 filters.

Thus, it was determined that H11 filters are the best option, given its superior CADR over the other two and how it strikes a balance between air flow, energy consumption, and noise levels.

More information can be found here.

Yes. Testing from an independent laboratory showed that both the AirFanta 3Pro (standard: T/GDAR 0001-2020, test report: KY202300057) and AirFanta 4Lite (standard: GB/T 34012-2017, test report: KY202302335) removed 99.99% of the H1N1 influenza virus.

As for SARS-Cov2 (COVID-19), based on findings from multiple studies, there is strong evidence that the virus resides in exhaled aerosols in the 1 to 5 microns range. AirFanta’s filters can remove 99.4% to 100% of viral aerosols in this range.

Our findings from both H1N1 and SARS-Cov2 (COVID-19) should also apply to other kinds of airborne viruses as well, as the size of viral aerosols exhaled from an infectious person doesn’t change much regardless of the type of virus.

All air purifiers offered on sale have been tested to check for their efficiency against various pollutants, and have been certified according to various electrical appliance standards. Click here to view third-party test reports.

Air purifiers that come with an AC adapter have been certified with the Singapore Safety Mark and approved for sale in Singapore.

Yes! Product-specific FAQs can be found at the bottom of each product listing on the dokuki official website. You can find the product listings here.

All air purifiers sold by dokuki on our official website (https://dokuki.com) and e-commerce stores (Shopee/Lazada), as well as dokuki’s authorized retailers and resellers in Singapore have 1-year local warranty coverage.

Click here to view the warranty terms.

Yes. Click here to register your warranty.

dokuki reserves the right to refuse warranty registrations if we cannot verify the proof of purchase.

Please contact us and provide us the following information:

1. Detailed information on the issue(s) with the product
2. Photos / videos showing the issue(s) with the product
3. The name that you used for the warranty registration

Once we are able to verify the information provided and that the product meets the requirement for repair, we will provide instructions on how to send your product in for repair.

Please note that all appointments are strictly by booking only, as we do not accept walk-ins for repair.

Extended warranty extends the warranty of your product by a certain period of time, giving you a peace of mind if your product requires repairs after the initial warranty period. The terms and conditions for extended warranty are the same as the terms for the initial warranty period.

You will have the option to add extended warranty to your product if the option is available on the product page. Please note that you cannot purchase extended warranty after the purchase of a product, meaning they have to be purchased together at the same time.

By default, all products shown on our website are in stock, unless stated otherwise on the product page, cart, or website.

Pre-orders will be shipped on the release date or estimated shipping date shown on the product page, cart, or website.

Back-orders will require up to 6 weeks for fulfillment.

Processing times take between 1 – 4 business days, depending on when the order was placed.

Pre-orders will be shipped on or after the release date, and back-orders will take 3 to 6 weeks.

Order cancellations are not accepted.

We can change your address if your order hasn’t shipped yet. Please contact us to change your address. We cannot change your address for orders that have already shipped.

If an in-stock item is ordered together with a pre-order or back-order item, all items in the order will be shipped together at the same time.

Depending on the contents and release date of products of your order, yes. Please contact us for more information. We cannot merge orders for orders already shipped.

Please contact us and tell us your order number and provide us information and photos of the items that were damaged. We will be happy to assist you!

Unfortunately, we do not accept returns, but we are happy to offer an exchange should your order arrive in a damaged state.

dokuki supports credit cards and debit cards from the following brands:

VISA, Mastercard, American Express

We also support the following payment methods:

• PayNow
• GrabPay
• Apple Pay
• Google Pay

With the exception of PayNow, all payments are processed through Stripe.

Please note that subscription products (products with recurring orders/payments) must be paid by credit card or debit card.

All prices are listed in Singapore Dollars (S$).

Subscription products (products with recurring orders/payments) must be paid by credit card or debit card.

We may ship your order through SingPost, NinjaVan, or our own courier. It may take 1 to 3 business days for your order to arrive.

Free shipping applies to all orders with a minimum spend of S$75.

Free shipping also applies to all subscription products regardless of their price. However, in the event a non-subscription product is ordered together with a subscription product in the same cart, the minimum spend rule will apply.

For orders under S$75, please check the shipping estimate on the cart or checkout page.

You can track your order by clicking the tracking link in the Order Complete email.

We do not ship to countries outside Singapore at this time.

The discount coupon you tried to use may have expired, or you may not have met the conditions for using it.

Please note that some coupons are only available to customers that have registered an account on our website.

Depending on the coupon, yes.

You can receive coupons through multiple ways. The best way is to receive new coupons is by signing up on our newsletter.

Depending on the coupon, yes. By default, the discount will only apply to the first order in the subscription, meaning it will not apply to recurring orders after the first order.

A subscription allows you to receive a product on a recurring basis. Subscriptions will ship within 1 to 4 business days upon successful payment on the renewal deadline. Payment is automated, so you will not need to manually pay on your end. The delivery frequency (every month, 3 months, 6 months, etc) depends on the product that you have subscribed to.

Free shipping is offered for all subscription products. Minimum spend rules for free shipping will apply if a subscription product is ordered together with a non-subscription product.

Certain subscription products are offered at a price lower than what you would pay for individually, however they may have a minimum number of deliveries required before cancellation. Please check the product page for more information.

Click here to view all subscription products.

That depends on the renewal deadline. For example, if you subscribed to a subscription product with monthly deliveries on January 1st, your next renewal would occur on February 1st. Your card will be automatically charged on that date, and your order will ship within 1 to 4 business days upon successful payment.

1. Hassle-free replacements – Gone are the days you have to remember when you have to replenish a product. Get them delivered regularly and automatically to your doorstep
2. Generous discounts – Save more through a subscription instead of purchasing a product manually every time you need it
3. Free shipping – Regardless of the value of the order, shipping is free

You can view all your subscriptions on the My Account page.

Yes. Please contact us at least 1 week before the renewal date if you need to temporarily pause your subscription.

After you have met the minimum number of deliveries for the subscription product, you can cancel your subscription for free, at least 1 week before the renewal date, by contacting us.

You can change your payment method on the My Account page.

You can change your shipping address on the My Account page. Please make sure you change your shipping address at least 1 week before the renewal date.

If you are unable to change your shipping address on the My Account page or have any urgent requests, please contact us.

Yes.

Yes. Please contact us and tell us more about the products you are interested in.

We love hearing from the press! Please contact us with your ideas.

Please contact us for more information.