Upgrade and Retrofit of Exhaust Gas and Dust Treatment Systems
Stack monitoring failing, weak extraction hoods, dust and odour still escaping into the workshop? Nanoen surveys and measures to find the real cause, then proposes a retrofit that reuses existing equipment and keeps production downtime to a minimum.
- Pinpoint the cause of non-compliance
- Reuse existing equipment
- Minimal machine downtime
- Monitoring and permit paperwork support
Common challenges for businesses
If you are facing any of the situations below, Nanoen can help.
Stack monitoring fails
Dust or certain gas concentrations exceed the limits of the applicable standard (QCVN 19, QCVN 20 or a sector-specific standard).
Poor capture, dust in the workshop
Badly positioned hoods and leaking or clogged ducts let dust and fumes escape into work areas.
Undersized extraction fan
The fan lacks flow or pressure, or is worn, especially after extra extraction points have been added.
Higher capacity, new requirements
Expanded production increases exhaust volume, or the permit now requires stricter limits than the original design.
Who this service is for
- Plants with failing emission monitoring results, warnings or penalties
- Facilities adding lines, boilers or dryers that increase exhaust flow
- Dust and exhaust gas systems that have run for years with worn equipment
- Businesses preparing to apply for or amend an Environmental Permit
Serving businesses in Hanoi, Bac Ninh, Hung Yen, Hai Phong, Ninh Binh, Phu Tho and neighbouring provinces.
Scope of work
- Site survey and measurement of flow, temperature and pressure at hoods and ducts
- Performance review of each unit: cyclones, bag filters, scrubbers, activated carbon
- Recalculation of hoods, ductwork and fans to match actual demand
- Retrofit proposal and additional treatment stages, with cost and schedule
- Fabrication, installation and tie-in of retrofit items; commissioning and tuning
- Post-retrofit monitoring with a monitoring provider and support updating environmental records
How Nanoen works
Survey → assessment → proposal → implementation → acceptance & handover. Every step has a clear deliverable you can track.
-
01
Survey
Inspect the production line, emission points and the whole collection and treatment system.
-
02
Assessment
Measure parameters and identify why emissions fail or capture is poor.
-
03
Proposal
Retrofit option, items to keep, cost and schedule.
-
04
Implementation
Prefabrication, then installation and tie-in at a suitable time to limit downtime.
-
05
Acceptance
Commissioning, monitoring and evaluation, handover and operating instructions.
Capabilities and completed projects
Photos from projects Nanoen has consulted on, designed and built.
- Since 2020working in the environmental sector
- 3 officesHanoi · Can Tho · Ho Chi Minh City
- Engineers & specialistsenvironmental compliance and engineering
- From consulting to constructionone partner from permits to plant
Frequently asked questions
Do we need to replace the whole exhaust gas treatment system?
Not necessarily. Often it is enough to rework hoods and ducts, replace the fan or add one treatment stage. A recommendation is only made after an on-site survey and measurements.
Why is there still dust in the workshop after installing a system?
The cause is usually in the capture stage: hoods too far from the source, insufficient capture velocity, leaking ducts or a fan without enough flow. Nanoen measures each extraction point to find what needs fixing.
Will the retrofit require a long production shutdown?
Most equipment is prefabricated in the workshop, so downtime is mainly for tie-in. The schedule is agreed with the plant before work starts.
Does a retrofit require amending the Environmental Permit?
If the exhaust gas treatment works change from what was permitted, the permit may need to be amended. Nanoen reviews this and advises on the related procedures.
Request a Site Survey
Leave your details and a Nanoen engineer will contact you about Air Emission System Upgrade & Retrofit.
Our offices
- HanoiSố 52 TT6 Khu đô thị Văn Phú, phường Phúc La, Hà Đông, Hà Nội
- Can Tho661E/29 Võ Văn Kiệt, KV Bình Yên A, P. Long Hòa, Q. Bình Thủy, TP. Cần Thơ
- Ho Chi Minh City533/12/7 Phạm Văn Bạch, P.15, Q. Tân Bình, TP. Hồ Chí Minh
Office locations
Số 52 TT6 Khu đô thị Văn Phú, phường Phúc La, Hà Đông, Hà Nội
Get directions533/12/7 Phạm Văn Bạch, P.15, Q. Tân Bình, TP. Hồ Chí Minh
Get directions661E/29 Võ Văn Kiệt, KV Bình Yên A, P. Long Hòa, Q. Bình Thủy, TP. Cần Thơ
Get directions