Keep Omicron away from our students and staff – Replace the filters

To prevent and control coronavirus disease spreading in schools, Hong Kong government has announced the suspension of classes in kindergartens and primary schools from Friday through the Lunar New Year holiday.

Suspension will not relieve the concerns of parents and students. Hundreds of thousands of students will head back to school after CNY holiday. They are still facing the threats of Omicron and forced to accept the unsafe learning environment.

The ventilation systems in schools are the key to decide whether it is safe.

Why good ventilation is so important?

Someone who has coronavirus breathes out small particles (aerosols) of the virus. Adequate ventilation reduces how much virus is in the air, so it reduces the risk of breathing in the virus.

ASHRAE (American Society of Heating, Refrigerating, and Air-conditioning Engineers) reported in their journal of August 2020 that a high efficiency filter is effective in capturing airborne virus particles and hence reduce the risk of spread of viruses.

Research has shown that the particle size of the SARS-CoV-2 virus is around 0.1 µm (micrometer). However, the virus does not travel through the air by itself. Since it is human generated, the virus is trapped in respiratory droplets and droplet nuclei (dried respiratory droplets) that are predominantly 1 µm in size and larger.

The air you and your students’re breathing indoors is dirtier than you think⚠️


Job reference



TWGHs Lions Club of South Kowloon Nursery School

NanoFIL ERV filter is installed in the air intake of ventilation system, effectively improve indoor air quality in classroom with low pressure drop.

ERV Filter

✅ Filter PM 2.5 particles

✅ Exterminate bacteria

✅ Easy Installation

✅ Tailor-Made Sizes

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Install high quality air filters in your schools

NanoFIL Sterilizing Nano-filter has recently been accredited invention patent and verified by SGS, it exterminates above 99.9% of bacteria, 95.6% virus and effectively filter PM 2.5, PM 0.3 (Anti Allergic series) particles, including smoke, smog, mite and other allergens; remove volatile organic compounds (VOC) and formaldehyde, indoor odor.

Clean air


Clean Air Anti-Allergic Odour Removal

Filtration efficiency

The best ventilation, Effectively improve air quality The best filtration efficiency Excellent filtration performance, Effectively reduce indoor odor

Exterminate bacteria

Filter PM2.5 particles

Filter PM0.3 particles

Removal of volatile organic compounds (VOC) and formaldehyde, indoor odor

Easy installation !

Just one simple cut, suitable for air conditioners, dehumidifiers, air purifiers.


Ceiling Cassette Air Conditioner

Split Air-Conditioner Window Air-Conditioner Dehumidifier

Air Purifier

Installation Guide

1) Remove the original dust filter, clean it and let it dry

2) Cut “NanoFIL Sterilizing Nano-Filter” to the size of the original dust filter

3) Attach “NanoFIL Sterilizing Nano-Filter” on the original dust filter with adhesive tape (the dotted embossed cotton layer is facing out, and the non-cotton layer is facing the electrical appliance)

4) Put the original dust filter back to the electrical appliance

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