Description
Double Outlets Centrifugal Fan
One Fan, Two Directions. Engineered with dual opposing discharge ports for flexible air distribution in large industrial ventilation layouts.
Product Specifications
Complete performance parameters for the LWFDF5-70 series models.
| Model | Speed (r/min) | Matching Motor (kW-p) | Flow Rate (m³/h) | Total Pressure (Pa) |
|---|---|---|---|---|
| LWFDF5-70-2.8A-1.1-2P-1-001 | 2900 | 1.1-2 | 1244-2490 | 1068-723 |
| LWFDF5-70-2.8A-0.55-4P-1-002 | 1450 | 0.55-4 | 622-1244 | 270-184 |
| LWFDF5-70-3.15A-1.5-2P-1-001 | 2900 | 1.5-2 | 2010-3870 | 1370-938 |
| LWFDF5-70-3.15A-0.58-4P-1-002 | 1450 | 0.55-4 | 1003-1890 | 345-238 |
| LWFDF5-70-3.55A-3-2P-1-001 | 2900 | 3-2 | 2980-5514 | 1769-1220 |
| LWFDF5-70-3.55A-0.55-4P-1-002 | 1450 | 0.55-4 | 1489-2758 | 442-306 |
| LWFDF5-70-4A-4-2P-1-001 | 2900 | 4-2 | 4382-8009 | 2276-1575 |
| LWFDF5-70-4A-0.75-4P-1-002 | 1450 | 0.75-4 | 2191-4005 | 572-388 |
| LWFDF5-70-4.5A-7.5-2P-1-001 | 2900 | 7.5-2 | 6369-11535 | 2924-2017 |
| LWFDF5-70-4.5A-1.1-4P-1-002 | 1450 | 1.1-4 | 3185-5766 | 734-507 |
| LWFDF5-70-5A-15-2P-1-001 | 2900 | 15-2 | 8855-15939 | 3647-2536 |
| LWFDF5-70-5A-2.2-4P-1-001 | 1450 | 2.2-4 | 4428-7970 | 906-637 |
Centrifugal Impeller for Two-Outlet Air Delivery
The rotating centrifugal impeller builds airflow and pressure, while the casing guides the air toward both outlets to support two-way ventilation.
This specialized double-outlet architecture is designed to split the volumetric output precisely at the source. Rather than relying on restrictive duct splitters downstream, the dual volute paths channel the accelerated air equally into two opposing duct lines, providing massive volumetric output up to 15,939 m³/h.
- Dual Outlets — splits the airflow symmetrically directly from the fan housing
- Centrifugal Impeller — provides strong kinetic energy for large-scale ventilation
- Symmetric Distribution — maintains balanced static pressure across both exhaust paths
Reliable Motor for Ventilation Duty
The motor is selected to match the fan’s operating requirements, providing dependable power to drive the impeller for ventilation and air exchange.
Driving a dual-discharge impeller demands consistent, unwavering torque to limit stalling. Equipped with heavy-duty industrial motors scaling up to 15 kW, this unit is engineered for S1 continuous duty cycles. This robust powertrain supports high volumetric turnover in expansive factory workshops.
- Matched Power — reduces motor overheating during extended continuous operations
- Impeller Drive — generates stable rotational force for high-capacity air exchange
- Ventilation Duty — handles the rigorous demands of large-scale industrial building exhaust
Fewer Bends, Lower Duct Pressure Losses
The opposing outlets help reduce the need for duct bends when supplying air in two directions. Fewer bends can lower local pressure losses and help control ductwork costs.
Every 90-degree bend or T-junction in an HVAC system significantly increases aerodynamic drag and turbulence. By discharging air directly into two opposing straight duct runs, this fan bypasses the need for expensive sheet metal splitters, conserving the kinetic energy of the airstream and improving overall system efficiency.
- Fewer Duct Bends — avoids the aerodynamic penalties of complex pipe routing
- Reduced Bend Losses — preserves static pressure for longer downstream air delivery
- Simplified Duct Layout — lowers material and installation costs for mechanical contractors
One Fan Supplies Air in Two Directions
Two outlets positioned in opposite horizontal directions allow simultaneous air delivery to two duct routes, making the fan suitable for layouts requiring air supply on both sides.
This layout is highly advantageous in large commercial buildings, production halls, and long factory corridors. Instead of installing two separate blowers at the center of a building, a single LWFDF5-70 unit can power two entirely independent ventilation zones, cutting equipment and electrical installation requirements in half.
- Two Outlet Routes — supports symmetric air distribution from a single central location
- Flexible Air Distribution — adapts easily to expansive factory and warehouse layouts
- Cost Effective — powers two ventilation zones with one motor
Direct Drive for Simple Power Transmission
The direct-drive arrangement transfers motor power to the impeller without a belt transmission, reducing transmission components and eliminating belt tension adjustment.
By mounting the impeller directly onto the motor shaft, the Type A configuration operates with nearly zero slip loss. This supports maximum energy efficiency and significantly reduces maintenance overhead for facility managers, as there are no belts to fray, snap, or require periodic re-tensioning in hard-to-reach ceiling installations.
- Zero Transmission Loss — maximizes the aerodynamic output per kilowatt consumed
- Fewer Transmission Components — lowers the probability of mechanical failure
- No Belt Tension Adjustment — provides a low-maintenance ventilation solution
Suitable for Non-Sticky Gas Streams
Suitable for ventilation gases free from sticky substances, with dust and hard particle content not exceeding 150 mg/m³.
To maintain the aerodynamic efficiency of the dual volute casing and shield the carbon steel impeller, the exhausted media must remain free of heavy viscous particulate. This precise parameter limits rotor imbalance and supports continuous, reliable air distribution across building networks.
- ≤150 mg/m³ Limit — engineered for relatively clean air and low-dust environments
- Non-Sticky Media — limits blade buildup and eccentric rotational stalling
- Stable Air Exchange — suitable for general factory ventilation and building HVAC integration
Drive Configuration for Flexible Installation
Engineered with a direct drive arrangement to match space-saving installation requirements.
A Type | Direct Drive
Features a compact structure with a direct connection between the motor and fan. This bypasses mechanical transmission losses and is highly suitable for space-saving installations and simple system integration inside machinery without the need for belt maintenance.
Wide Range of Applications
Dual-discharge design streamlines ductwork in expansive industrial and commercial facilities.
Factory Workshops
Provides symmetric, high-volume air exchange to clear heat and stale air across large manufacturing floors.
Warehouses
Simplifies overhead ducting by pushing ventilation evenly down two separate storage aisles simultaneously.
Production Halls
Reduces the quantity of blower units needed by centrally supplying fresh air to opposing production zones.
Commercial & Public Buildings
Integrates smoothly into building HVAC systems, splitting main supply lines without restrictive duct splitters.
Logistics Centers
Efficiently manages environmental temperatures across massive, open-plan distribution facilities.
Building Ventilation System
Lowers mechanical installation costs by streamlining duct layouts in centralized commercial air handling projects.
LONGWELL — Trusted Industrial Fan Manufacturer Since 1990
Founded in 1990 in Yuyao, Ningbo — the heart of China’s advanced manufacturing belt — LONGWELL has grown from a precision fan component workshop into a vertically integrated ventilation technology group. Today we engineer AC, DC and EC fan and motor systems with 4,000 m²+ of manufacturing floor, dedicated aerodynamics and CFD simulation labs, and a global export network spanning Europe, the Americas and Asia-Pacific.
From material selection to final balancing, every LONGWELL fan is built on automated lines, computer-balanced impellers and 100% run-test before shipment. We are certified to ISO 9001:2015 and ISO 14001, with CE, UL/ETL, RoHS and EAC compliance, and performance tested to the AMCA 210/211 method.
Production & Delivery
Automated lines, computer-balanced impellers and a 100% run-test on every unit, so each LWFDF5-70 fan arrives ready to install.
Global HVAC&R Exhibitions Participation
Meeting HVAC distributors, project contractors, and OEM engineering teams at international trade fairs worldwide.
Trusted by Leading Global Brands
24+ commercial equipment builders rely on LONGWELL for industrial centrifugal blowers every year.
Complete Range of Professional & Certified
LONGWELL fans are independently certified to international quality, safety and energy-efficiency standards.
Global Market & Client Preference
The LWFDF5-70 series is specified by commercial building contractors and clients across Europe, the Middle East, Southeast Asia and the Americas.
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View Product →Frequently Asked Questions
Quick technical answers about the LWFDF5-70 double outlets centrifugal fan.
What is the main advantage of a double outlet centrifugal fan?
The primary advantage is that a single fan can supply air in two opposite directions simultaneously. This bypasses the need to install complex Y-joints or severe duct bends to split the airflow, which reduces local pressure losses and lowers ductwork fabrication costs.
What type of air is this fan suitable for handling?
The LWFDF5-70 series is designed for exhausting and supplying non-sticky gas streams, with dust and hard particle content not exceeding 150 mg/m³. It is heavily utilized in large-scale building ventilation and air exchange.
What are the performance capabilities of the LWFDF5-70?
Depending on the model, it can deliver flow rates ranging from 622 m³/h up to 15,939 m³/h, and generate total pressure between 270 Pa and 3,647 Pa. It is paired with direct-drive motors from 0.55 kW to 15 kW.
What drive option is used in this series?
This series utilizes a Type A Direct Drive configuration. The impeller is mounted directly onto the motor shaft, providing a compact, zero-transmission-loss footprint that eliminates the need for belt maintenance.
Need a Quote or Custom Specs?
Send us the air volume, total pressure, and installation layout. Our engineers will match the right LWFDF5-70 model and reply within 24 hours.
