Airflow Visualization & Fogging Systems
Select fogging technology by environment, working fluid, required visual distance and the scale of the airflow study—not by fog volume alone.
| System | Technology | Working fluid | Best fit |
|---|---|---|---|
| CRF3 | Ultrasonic | DI / sterile / WFI water | Localized and mid-scale airflow visualization |
| CRF6 | Higher-output ultrasonic | DI / sterile / WFI water | Larger airflow visualization requirements |
| AP30 | Self-pressurized LN₂ | Liquid nitrogen + DI water | High-purity, longer-travel visualization |
Ultrasonic versus LN₂ fogging
Ultrasonic foggers generate visible fog through water atomization and are often selected when portability, straightforward setup and localized visualization are priorities. Liquid-nitrogen systems generate a different fog profile and are selected when high purity, density and longer visual travel are required.
Do not over-specify the fogger
The right system depends on the test environment. Barrier isolators, biosafety cabinets, rooms, pass-throughs and larger controlled spaces impose different requirements. Hose geometry, outlet location and pressure relationships can matter as much as nominal fog output.
For a project-specific recommendation, include enclosure dimensions, pressure relationship, desired visual distance and whether the fogger must remain outside the test space.
Choose the fogging platform around the test geometry
| Decision point | CRF3 | CRF6 | AP30 |
|---|---|---|---|
| Fogging technology | Ultrasonic, water-based | Higher-output ultrasonic, water-based | Self-pressurized liquid-nitrogen platform |
| Typical selection logic | Localized or mid-scale visualization where portable ultrasonic fogging fits | Larger ultrasonic demand, dual outlet routing or greater fog volume | Studies designed around LN₂ fog and a self-pressurized delivery system |
| Primary RFQ variables | Test-space dimensions, pressure relationship, fogger location, hose route, desired visual distance, working-fluid constraints and procedure requirements | ||
This table is a selection starting point, not a substitute for the manufacturer’s current configuration or an application review.
Pressure and hose routing can dominate the result
A fogger that produces visible fog in open air may behave very differently when connected through a long hose, reducer, bend or pressurized enclosure. Positive pressure can resist fog introduced from outside. Restrictions reduce delivered flow and can undermine an otherwise reasonable model choice.
Document the complete path
- Where the fogger will sit relative to the test space
- Total hose length and internal diameter
- Reducers, elbows, splitters and outlet fixtures
- Pressure relationship and return-air path
- Required visibility distance and recording position
Equipment does not create compliance by itself
Fogging equipment makes airflow visible. The facility’s protocol, operator technique, camera placement, acceptance criteria and quality approval determine how the study is executed and documented. Avoid marketing language that treats the fogger as the validation procedure.
Buying and specification questions
Answers are intentionally scoped to the purchasing decision. Final engineering details, configuration, price and lead time are confirmed in the quotation and manufacturer documentation.
What is the main difference between CRF ultrasonic foggers and the AP30?
CRF3 and CRF6 are ultrasonic water-based systems. AP30 is a self-pressurized liquid-nitrogen fogging platform. The facility procedure and test geometry determine which technology fits.
Which ultrasonic model is higher output?
CRF6 is the higher-output ultrasonic platform and uses dual 80 mm outlets. CRF3 is positioned for portable and mid-scale work. Final model selection should account for geometry, pressure and hose routing.
Can a fogger remain outside a positive-pressure isolator?
It can be possible, but pressure and delivery restrictions can materially reduce fog entering the enclosure. Send the pressure relationship and hose route for review.
Does buying a fogger make a smoke study compliant?
No. The equipment supports visualization; the facility’s procedure, operator practice, documentation and acceptance criteria govern the study.
Build the smoke-study requirement before selecting output
Pressure, hose routing, operating state, interventions and video evidence can matter more than a single fog-volume number.
Seven fogger models across three technology architectures
Compare compact, mid-scale, high-output, self-pressurized LN₂ and dewar-style LN₂ systems without treating one model as universally superior.
Fogger supplier comparison
Compare architecture, delivered fog, route, controls, accessories and documentation.
Complete the cleanroom test toolkit
Pair airflow visualization with air-velocity measurement, particle counting and HEPA leak-test equipment when the qualification scope requires it.
Estimate runtime and crew effort before selecting the equipment path
Zones, observation points, repeats, setup and contingency can materially affect equipment and rental requirements.