Venturi Air Ejector for 150 mm Ventilation Duct | 118 mm Fan Inlet | 85/95/105 mm Nozzles
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The goal of this design is not to create a stronger air jet, but to maximize the total volume of room air moved into the
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Venturi Air Ejector for 150 mm Ventilation Duct
Experimental 3D-printable air ejector designed to increase the total amount of room air entering a ventilation duct by using the airflow from a duct fan to entrain additional surrounding air.
Unlike a simple 118 → 150 mm adapter, this design uses a central nozzle surrounded by an open secondary-air inlet. The primary airflow passes through the nozzle and mixes with additional air drawn from the room.
The design is modular, so different nozzle diameters can be tested without reprinting the main housing.
Main dimensions
Fan / inlet connection: Ø118 mm OD / Ø114 mm ID
Ventilation duct connection: Ø149.4 mm OD
Main outlet passage: Ø145 mm
Standard nozzle: Ø95 mm
Optional nozzles: Ø85 mm and Ø105 mm
Mixing section after nozzle: approximately 150 mm
Maximum housing diameter: approximately 170 mm
Total assembled length: approximately 265 mm
Included files
Main ejector housing
Ø95 mm nozzle
Ø85 mm experimental nozzle
Ø105 mm experimental nozzle
Ø118 mm inlet adapter
Test-fit rings for inlet and outlet
STEP assembly
Individual STEP files
Dimensioned PDF drawing
Why interchangeable nozzles?
The best nozzle diameter depends on the fan pressure, airflow, duct resistance and installation. A smaller nozzle produces a faster primary jet but also increases resistance to the fan. A larger nozzle reduces restriction but may produce less entrainment.
For this reason, Ø85 / Ø95 / Ø105 mm versions are included for experimental comparison.
Printing
Recommended starting point:
Layer height: 0.20 mm
Walls/perimeters: 5–6
Top/bottom layers: 5
PETG, ASA or ABS recommended for a functional ventilation installation
Print the supplied test-fit rings before printing the full housing. Real ventilation pipes may differ from their nominal diameter.
The main housing and nozzle are designed to print flange-down.
Assembly
The nozzle is attached to the housing using 4 × M4 bolts.
Keep the large annular air intake around the nozzle completely open — this is where secondary room air enters the ejector.
Seal the connection between the ejector and the ventilation duct, but do not seal or cover the secondary-air inlet.
Important
This is an experimental airflow device.
The geometry has been checked as a printable CAD model, but the design has not yet been CFD-validated or calibrated on a laboratory airflow bench.
Actual entrainment depends strongly on the fan and the resistance of the ventilation system. In installations with excessive back pressure, secondary airflow can decrease significantly or even reverse.
If you print and test it, please share your Make and, if possible, include:
fan model
nozzle diameter
duct diameter
measured airflow
This will help improve future versions.