Holding a 84% share of the domestic rental market for dust collectors for tunnel construction

Ryuki Engineering is an engineering manufacturer that realizes the creation of an optimum environment for solving problems in
production fields, such as dust collection, deodorization, dehumidification, and water treatment.

*Percentage of our orders for public tunneling projects ordered domestically. Period October 1, 2022 - September 30, 2023

Product Lineup

Dust collectors/Smoke collectors

Custom-made machines

We manufacture dust collectors according to your requirements
by fully utilizing our abundant experience and technologies.

Small type, Large type, On-board, built-in type, Pin-mount type,
Cyclone-integrated type, Hopper type, High withstand pressure type,
Odor/gas absorption type, Explosion-proof type, For blasting, Purification of the air and more.

• Versatile types of filters available according to the purpose
• Automatic filter cleaning
• Flexible setup of working airflow
• Measures for lowering noise

Fan and blowers

Ryuki Engineering's unique pleated filter

The characteristics of our pleated filter

The characteristics of our pleated filter

  1. 1Compact

    The filtering cloth area of this product is approximately 20 times larger than general bag filters.
    It serves as the source of overwhelming suction power.

  2. 2Maintenance-free

    Automatic restoration with strong supersonic impulse prevents clogging.
    It reduces the labor and time required for the replacement and maintena+C39nce of general bag filters.

  3. 3High cleanliness

    The cleanliness at the outlet of the filter that we achieve as standard is 0.1 mg/m³ or lower, which is as high as the atmospheric dust level.



Significant reduction in installation space

The large surface area and compact design require fewer filters than general bag filters, and the main unit size and weight of the dust collector are one-fifth and one-third, respectively. Therefore, the installation area can be reduced significantly.

General bag filter Our pleated filter
Number of filters 400 20

[Verification] The number of filters required to install a dust collector with the filter cloth area of 1,000 m.


Supersonic impulse

To shake off powder dust attached to the filter strongly, a supersonic impulse (shock wave) that is generated when releasing compressed air is given to the filter.
The automatic filter cleaning feature prevents clogging and enables continuous operation with no maintenance.


3High cleanliness

The outlet cleanliness is 0.1 mg/m³ or lower

The cleanliness of the air discharged from our standard filter is as high as 0.1 mg/m³ or lower, which is at the same level of fine particle content as the general atmosphere.
In addition, our PTFE filter for fine particles has achieved the cleanliness of 0.01 mg/m³ or lower, which is the same level as clean rooms, and are adopted in the nuclear, space, biological, and precision electronic fields.


The cleanliness of 0.1 mg/m³ or lower refers to the condition where 1/10,000 g of particles exist in a space of 1 m³.

Actual achievements

We have supplied ventilation systems for tunnel and shield construction all over the world.

We have supplied ventilation systems for tunnel and shield construction all over the world.

Korea, Hong Kong, Taiwan, China, Indonesia, Singapore, India, Thailand,
Malaysia, Vietnam, Sri Lanka, Pakistan, Laos, Kenya, Algeria, Turkey, Ireland, and Dubai


Support Support

We offer detailed support so that customers can use our products without any anxiety.

  • Tests using real products and study of specifications
  • Measurement of dust content and particle size distribution
  • Detailed design
  • Assembly
  • Delivery
  • Commissioning
  • Repair and maintenance work
  • Troubleshooting
  • Supply of spare and consumable parts


Inquiries are accepted via e-mail.

When contacting us, please be sure to include the following information:
- A confirmation that you have viewed our website
- The details of your inquiry (such as request for catalogs, questions about our catalogs, request for quotation)
- Your name and company name

We will deliver products that meet your needs through our worry-free support system. Please feel free to contact us!

About Ryuki Engineering


"Craftspersonship" of Ryuki Engineering

We are a group of technical experts who have been displaying strength in environmental control technology centering around fluid machinery since our establishment and have approximately 60 patents as the foundation for applying the technology.
We develop not only dust collectors but also a wide variety of environmental testing equipment for various fields, such as aerospace, nuclear, and biomass fields, and are also involved in the development of unique equipment, such as fine particle sterilization equipment.
We are advancing the development of environmental equipment toward the creation of an optimum environment while paying a lot of attention to the "craftspersonship" of our original products.

The world's largest number of ventilation facilities we own

The world's largest number of ventilation facilities we own

We own 300 large-sized dust collectors and 650 air blowers, which is one of the world's largest number of facilities owned by a ventilation equipment company that is unsurpassed by competitors.
We conduct research, development, and assembly tests of new models and maintenance of rented products in Tsukuba Techno Center that is our technology base (Chikusei City, Ibaraki Prefecture) before delivering products to customers' sites.

Company outline

Company name Ryuki Engineering Inc.
Establishment May 1977
Head office Ichigo Hijirizaka Building, 3-4-2, Mita,
Minato-ku, Tokyo 108-0073 Japan
Capital 40,000,000 yen
Representative Satoshi Nishimura, President and CEO
Accounting period September
Number of employees 149 (as of the end of March 2023)
Business outline

Business outline

  • 1. Design and development of fluid equipment and facilities as well as pressure flow control equipment
  • 2. Installation, servicing, and maintenance of the above machinery and equipment
  • 3. Design and development of space-related ground test equipment
  • 4. Design and development of nuclear-related equipment (decontamination and volume reduction fields)
  • 5. Planning, development, and sales of industrial machinery
  • 6. Consulting service for ventilation systems
  • 7. Planning and development of environmental equipment
  • 8. Lease and sales of environmental equipment
As an engineering manufacturer,
we fulfill customers' desires to create thrills and pleasures more than expected.