Ductless Jet Induction Fan for Underground Garage Ventilation

The induction fan operates on the core aerodynamic principle of jet entrainment (Coanda & momentum transfer effects). Multiple units are systematically arranged at calculated intervals and orientations across the space. As the internal high-efficiency impeller rotates at high speed, a high-velocity directional air jet is discharged through specialized distribution nozzles.During movement, this high-velocity jet stream creates a negative pressure boundary layer that naturally entrains and mobilizes a large volume of surrounding ambient air. This design achieves high-capacity volumetric air circulation using minimal initial primary air supply, ensuring efficient space-wide ventilation and air exchange while eliminating stagnant air zones without requiring complex ductwork networks.

Additionally, individual units can be deployed strategically in localized dead zones to effectively dilute accumulated exhaust gases and air pollutants. Upon request, systems can be integrated with gas/pollutant concentration sensors (such as CO/NO2 monitors) and intelligent controllers to enable fully automated, demand-controlled ventilation (DCV).

System Features

 Streamlined Engineering & Flexibility: Simplifies ventilation system design, offers exceptional layout flexibility, lowers engineering revision friction, and reduces design errors.

 Ductless Architecture: Completely eliminates the need for expensive ductwork networks, conserving vertical ceiling clearance, simplifying installation, and significantly lowering long-term operational and maintenance costs.

 360° Adjustable Flexible Nozzles: Equipped with universal multi-directional nozzles that allow precision air jet orientation and dynamic airflow tuning on-site.

 Targeted Elimination of Stagnant Zones: Enables strategic placement directly addressing localized ventilation dead zones, maximizing air exchange efficiency and overall indoor air quality (IAQ).

L   Uprig

The Horizontal Ball-Nozzle Induction Fan comprises a high-efficiency centrifugal blower, a sound-attenuated acoustic cabinet, and three universal ball-joint discharge nozzles (Swivel Angle <60°, Nozzle Dimensions: φ80x 3).Features 8 adjustable nozzle mounting positions, enabling flexible, on-site nozzle orientation to adapt dynamically to diverse engineering design criteria and job-site conditions.Delivers significantly improved aerodynamic efficiency and higher airflow performance without expanding the overall footprint of the unit.

Schematic Diagram of an Induced Draft Fan (Duct-Type Nozzle Direction)

The Horizontal Ducted Induction Fan consists of a high-efficiency centrifugal blower, a sound-attenuated acoustic cabinet, and interchangeable discharge duct nozzles. Available duct nozzle configurations include φ80x 3, φ100x 2, or φ140x 1 (Duct Length: 400mm, Swivel Angle: < 45°).

Flat-Mount Installation

Product Description:

The Ducted Cabinet-Type Induction Fan consists of a precision die-formed structural frame, a high-pressure centrifugal blower, and an integrated noise-attenuating plenum box (Swivel Angle: <45°, Nozzle Diameter: φ36mm). Powered by a low-volume, high-static-pressure centrifugal fan (Pt≥1,750Pa), the unit connects to a pressurized spiral round duct system. It discharges ultra-high-velocity air streams through small-diameter nozzles fitted with integrated airflow balancing dampers for versatile site adaptation.

System Mechanics & Airflow Integration:

As a critical intermediate air-moving link in ductless and hybrid ventilation systems, the strategic placement of the intake/exhaust louvers and induction fan units directly dictates the aerodynamic efficiency of the entire space. An optimal layout establishes a primary airflow path between the main supply and exhaust points, while the induction fans generate high-momentum secondary jet entrainment to complete full-volume air exchange and remove stagnant air zones.

The required quantity of induction fans depends on the ventilation method (mechanical supply & exhaust vs. natural intake & mechanical exhaust), structural layout (presence of partition walls), and spatial geometry. The recommended coverage area per unit can be determined using the table below: