SINCE 1990
Commercial HVAC
End-to-End Fan & Motor Qualification Pack
A code-compliant fan platform for AHU / RTU / FCU / evaporator-condenser applications under DOE 2023 · ErP Tier 2 · IECC 2024 — LWBE3G backward-curved for AHU/RTU, LWFC forward-curved for FCU, LWAA axial for evaporators and condensers, LWM EC motor as the common drive. One supplier, four series, Fortune 500 validated.
Why Commercial HVAC Projects Choose LONGWELL
Commercial HVAC engineering pressure tightens on four fronts at once: energy codes (ASHRAE 90.1-2022 / EU ErP Lot 6 / DOE 2023 / IECC 2024), quiet-operation requirements for offices and healthcare, hard BMS-integration requirements from BIM/MEP engineering teams, and a 10-15 year service-life expectation. The LWBE3G + LWFC + LWAA + LWM platform treats all four as engineering preconditions from day one, not as later retrofits.
Complete Commercial HVAC Portfolio
LWBE3G backward-curved (AHU/RTU) + LWFC forward-curved (FCU/terminal) + LWAA axial (evaporator-condenser) + LWM EC motor common platform. A single supplier covering 95% of commercial HVAC OEM fan needs.
Energy Codes Cleared in One Pass
EC motor efficiency 88-92% — meets IE4 / EU ErP Tier 2 / DOE 2023 (67% fan system efficiency) / IECC 2024 out of the box. Field-measured 70-72% at a Top-3 North American RTU OEM.
Quiet for Offices & Healthcare
FCU conditions as low as 28-35 dB(A); AHU/RTU conditions typically 38-48 dB(A). Biomimetic blade profile + proprietary EC control algorithms cut up to 6.5 dB(A) versus the AC baseline.
Native Building Automation Integration
Modbus RTU + BACnet MS-TP standard, CANopen optional. Interoperability verified with Schneider EcoStruxure / JCI Metasys / Honeywell / Siemens Desigo BMS.
90-Day NPI + Production Stability
A Top-3 North American RTU OEM moved from 2023 inquiry to mass-production release across 6 sizes in just 90 days. 30 months of stable supply with zero field quality incidents. 3-year frame agreement renewed in 2026.
To Our Commercial HVAC Project Partners
To commercial HVAC OEMs, BIM/MEP engineering leads, and ESCO partners:
Thank you for advancing LONGWELL through your supplier qualification process. This Project Qualification Pack is tailored to your commercial HVAC application — extending the initial Supplier Qualification Pack with industry-specific technical detail, the series we recommend for your application, anonymized case evidence from comparable customers, and the test reports you will need at RFQ and DV/PV stages.
Every page beyond §2.5 has been selected because it is directly relevant to your commercial HVAC product line. The series pages reflect what we actually recommend for AHU, RTU, FCU and evaporator applications. The application matrix on the inside back cover maps your product taxonomy to ours, so your engineering team can validate fit at a glance.
Inside the next 28 pages you will find: our company foundation, our complete product portfolio, the four commercial-HVAC-relevant series with full specifications, our quality and compliance evidence, anonymized customer reference data, our checked test report inventory, and a clear engagement next-step path including indicative timelines and commercial terms. When you are ready to discuss specific models or request samples — my team can be on a call with your engineering and procurement leads within 48 hours.
Commercial HVAC Market Context
The global commercial HVAC market exceeds USD 200B annually and is growing at 6-8% CAGR through 2030. Three forces are converging at once: spill-over demand from data center cooling, post-pandemic indoor air quality regulations, and the tightening of energy codes (ASHRAE 90.1-2022, EU ErP Lot 6, IECC 2024). These are not incremental adjustments — they are an engineering-precondition reset for every commercial HVAC OEM.
| OEM Pain Point | Impact on OEM | LONGWELL Response |
|---|---|---|
| Tightening efficiency rules Code compliance | DOE 2023 / ErP Tier 2 / IECC mandate IE4 + fan system efficiency ≥ 67% | LWM EC platform 88-92% efficiency · field-measured 70-72% |
| Quiet-operation demand Office, healthcare, education | Office / healthcare / education ≤ 45 dB(A) @ 1m; FCU applications even ≤ 35 dB(A) | LWFC at FCU condition 28-35 dB(A) · LWAA tip speed 30% below baseline |
| BMS / BAS integration Building automation | Modbus RTU / BACnet MS-TP standard with smart speed control and remote diagnostics | Full EC platform native Modbus + BACnet; verified with Schneider / JCI / Honeywell |
| 10-15 year service life Long-life duty cycle | L10 bearing life ≥ 60,000h @ 40°C; DV/PV requires accelerated aging data | L10 ≥ 60,000h @ 40°C · ≥ 40,000h @ 60°C · accelerated aging data available |
For any commercial HVAC platform whose design kicks off after 2024, the EC motor is no longer "optional" — it is a "compliance precondition." AC-based platforms can no longer be certified against the new codes. LONGWELL serves multiple Top-5 North American RTU/AHU OEMs, three leading European FCU brands, and Asian commercial-building MEP integrators.
Global Energy Codes for Commercial HVAC
Fan System Efficiency (FEI) and motor energy class (IE4) are the two anchor metrics across every current commercial HVAC energy code. The LONGWELL EC platform is engineered around both from the start.
Regional Energy Codes & Targets
| Region / Regulation | Core Requirement | Effective |
|---|---|---|
| USA DOE 2023 | Fan system efficiency ≥ 67% · applies to commercial RTU / AHU | Mandatory from 2023-01-01 |
| USA ASHRAE 90.1-2022 | FEI (Fan Energy Index) ≥ 1.00 · fan power limits | Progressively adopted by states from 2024 |
| USA IECC 2024 | FEI ≥ 1.00 + IE4 motor mandate for fans | State-by-state adoption 2024-2025 |
| EU ErP Tier 2 (Lot 6) | Fan Minimum Efficiency Index FMEI ≥ 0.50-0.62 · tiered by airflow | Mandatory from 2015, revised 2022 |
| EU ErP Lot 11 (Motors) | IE4 motor mandate (0.12-1000 kW range) | Phased rollout from 2023-07 |
| China GB 21455 | VRF energy efficiency APF ≥ 4.5 · Grade 1 | 2020 revision in force |
Application Noise Targets vs LONGWELL Measured
| Application | Typical Site Noise Target | LONGWELL Measured | Series |
|---|---|---|---|
| Office AHU | ≤ 45 dB(A) @ 1m | 38-45 dB(A) | LWBE3G EC |
| Healthcare / Education FCU | ≤ 35 dB(A) @ 1m | 28-35 dB(A) | LWFC EC |
| Rooftop RTU (outdoor) | ≤ 65 dB(A) @ 1m | 48-58 dB(A) | LWBE3G EC |
| Evaporator / Condenser | ≤ 60 dB(A) @ 1m | 32-58 dB(A) | LWAA EC (tip speed -30%) |
LONGWELL supplies EC fan platforms to multiple North American RTU/AHU OEMs and European FCU brands. All EC variants meet DOE 2023 / ErP Tier 2 / IECC 2024 while hitting application-level noise targets simultaneously.
Four-Layer Commercial HVAC Fan Architecture
Modern commercial HVAC is not a single equipment type — it is four fan-application classes operating side by side. Each class has its own aerodynamic, static-pressure, noise and form-factor requirements. LONGWELL engineered products cover all four layers, and every EC variant runs on the common LWM motor platform.
AHU / Air Handling Unit
Air Handling Unit
LWBE3G backward-curved EC, 3G biomimetic blade profile, 88-92% efficiency.
RTU / Rooftop Unit
Rooftop Unit
LWBE3G backward-curved EC with IP55 outdoor configuration + mandatory UL/ETL for North America.
FCU / Fan Coil Unit
Fan Coil Unit · Terminal
LWFC forward-curved EC with 2024-redesigned scroll geometry.
Evaporator / Condenser
Evaporator / Condenser
LWAA axial EC with aluminum-alloy + composite hybrid blades.
Product Selection · LWBE3G + LWFC + LWAA + LWM
Exact selection parameters across the four series, matched to commercial HVAC application, energy code and noise targets. Every EC variant runs on the common LWM motor platform.
L1 / L2 · AHU & RTU Selection — LWBE3G Backward-Curved
3G-generation biomimetic blade profile delivers 5-8 percentage points of static efficiency over conventional backward-curved designs. 12 sizes cover 190-710 mm; EC variants meet DOE 2023 / ErP Tier 2 / IE4.
| AHU/RTU Capacity | Recommended Size | Airflow | Static Pressure | EC Efficiency |
|---|---|---|---|---|
| 5,000 m³/h (small AHU / 3-5 ton RTU) | LWBE3G-355 | 3,500-7,000 m³/h | 400-800 Pa | 88% |
| 10,000 m³/h (medium AHU / 7-10 ton RTU) | LWBE3G-450 | 7,500-13,000 m³/h | 500-1,000 Pa | 90% |
| 18,000 m³/h (large AHU / 15-20 ton RTU) | LWBE3G-560 | 14,000-22,000 m³/h | 600-1,200 Pa | 91% |
| 30,000 m³/h (XL AHU / 25 ton RTU) | LWBE3G-710 | 22,000-30,000 m³/h | 800-1,800 Pa | 92% |
▸ Verified BMS / BAS Compatibility (Schneider · JCI · Honeywell · Siemens · Trane)
| Schneider EcoStruxure | ✓ Verified | Modbus RTU + BACnet MS-TP dual protocol |
| Johnson Controls Metasys | ✓ Verified | BACnet MS-TP compatible |
| Honeywell Enterprise BMS | ✓ Verified | Modbus RTU compatible |
| Siemens Desigo CC | ✓ Verified | BACnet/IP gateway compatible |
| Trane Tracer SC+ | ✓ Verified | Integrated by a North American RTU OEM |
L3 · FCU Selection — LWFC Forward-Curved
2024-redesigned scroll geometry lifts total efficiency at the operating point to 65-72% (vs typical industry 55-60%). FCU conditions reach 28-35 dB(A) — fit for healthcare, education and premium office.
| FCU Capacity | Recommended Size | Airflow | Static Pressure | Noise @ Operating Point |
|---|---|---|---|---|
| 2-row | LWFC-146 DI | 200-500 m³/h | 30-80 Pa | 28-32 dB(A) |
| 3-row | LWFC-180 DI | 400-800 m³/h | 50-120 Pa | 30-35 dB(A) |
| 4-row | LWFC-225 DI | 700-1,400 m³/h | 80-180 Pa | 33-40 dB(A) |
| Large FCU / Small AHU | LWFC-280 DI | 1,200-2,000 m³/h | 120-200 Pa | 38-45 dB(A) |
L4 · Evaporator / Condenser Selection — LWAA Axial
Aluminum-alloy + composite hybrid blades with tip speed 30% below industry baseline. IP54 standard; IP55/66/68 customizable. 13 sizes cover 200-1000 mm.
| Application | Recommended Size | Airflow | Static Pressure | Configuration |
|---|---|---|---|---|
| Small evaporator / air-cooled cabinet | LWAA-400 | 1,500-4,200 m³/h | 50-150 Pa | Mounting Ring |
| Medium condenser / heat pump | LWAA-500 | 4,000-8,500 m³/h | 80-200 Pa | Mounting Ring / Plate |
| Large condenser / air-cooled chiller | LWAA-630 | 7,500-13,000 m³/h | 100-300 Pa | Cube Housing |
| Dry cooler / industrial ventilation | LWAA-800/910 | 12,000-22,000 m³/h | 150-400 Pa | Cube Housing · IP66 |
Common Motor Platform · LWM EC Motor Platform
LWM is the common motor platform that powers the EC variants of LWBE3G / LWFC / LWAA — external-rotor brushless DC with integrated drive electronics, designed and manufactured in-house by LONGWELL.
| Specification | Value | Specification | Value |
|---|---|---|---|
| Power Range | 30 W - 2,200 W (paired to 4,400 W) | Efficiency Class | IE4+ · 88-92% |
| Supply Voltage | 100-277 VAC (1ph) / 200-480 VAC (3ph) | L10 Bearing Life | ≥ 60,000h @ 40°C · ≥ 40,000h @ 60°C |
| Control Interface | 0-10V · PWM 1-20kHz · Modbus RTU · BACnet MS-TP | Operating Temp | -40°C to +80°C · cold start -30°C |
| EMC Class | EN 55014-1/2 Class B · FCC Part 15 Class B | Protections | Over-current / over-temp / stall / phase-loss / DC bus over-voltage / brown-out recovery |
Typical 10 ton Commercial RTU LONGWELL Configuration
The deployed 10 ton rooftop unit BOM at a Top-3 North American RTU OEM — a single RTU combines supply-air centrifugal + outdoor axial condenser fans on both sides, all driven by the LWM EC motor. One supplier, one commercial team, one spare parts library. Versus an AC solution, the per-RTU lifecycle (15 years) saves the end user USD 2,800+ in electricity.
Basis: 10 ton RTU, 2,500 cooling hours/year, $0.13/kWh commercial electricity, EC vs AC average power saving 35%.
| Layer | Model | Form Factor | Quantity | Unit Power |
|---|---|---|---|---|
| L1 | LWBE3G-450 EC | Supply-air Plug | 1 per RTU | 1.1 kW |
| L4 | LWAA-630 EC | Condenser Cube | 2 per RTU | 0.85 kW |
| M | LWM-EC1100 | EC motor platform | Common drive | — |
| Per-RTU Total | 3 fans | 2.8 kW | ||
Commercial HVAC Certification Matrix
All certificates are held by LONGWELL; original PDFs available on request. Gold-marked items carry the heaviest weight in commercial HVAC OEM supplier audits.
| Certification | Standard | Coverage |
|---|---|---|
| CE | EU Marking · Machinery / EMC / LVD | LWBE3G + LWFC + LWAA + LWM full range |
| UL ★ | UL 507 (fan) + UL 705 (axial) + UL 1004-1 (motor) | Mainstream North American sizes covered |
| ETL ★ | Intertek mark · US/Canada NRTL | Mainstream North American RTU/AHU models |
| EMC Class B | EN 55014-1 / EN 55014-2 Class B | Full EC platform |
| FCC | FCC Part 15 Class B | Full EC platform |
| CCC | China Compulsory Certification | China-market models |
| RoHS / REACH | EU 2011/65/EU + (EC) 1907/2006 | Full LWBE / LWFC / LWAA / LWM |
| ErP Tier 2 ★ | EU Energy-related Products · Lot 6 / Lot 11 | Full EC platform · FMEI ≥ 0.62 |
| DOE 2023 ★ | US DOE fan system efficiency ≥ 67% | LWBE3G + LWAA EC fully compliant |
| AMCA 210 | AMCA 210-16 Performance Standard | LONGWELL wind tunnel data + T3 equivalent evidence |
| ISO 9001 / 14001 / 45001 | Quality + Environment + Safety | ✓ Certified |
| BSCI | Social Compliance Audit | ✓ Audited |
Commercial HVAC Test Report Library
T1 = PDF delivered within 1 business day; T2 = scheduled at a named lab with a confirmed delivery date; T3 = equivalent evidence (same-series same-spec model report + engineering delta statement). T1-T3 services are complimentary for project-intent customers.
| Series | Report Type | Models Covered | Issuing Lab | Status |
|---|---|---|---|---|
| LWBE3G | UL 507 full coverage | 355/400/450/500/560/630 mm | UL (Northbrook IL, USA) | ✓ T1 Ready |
| LWBE3G | EN 60335-1 / EN 60335-2-80 | All 12 sizes | TÜV SÜD (Germany) | ✓ T1 Ready |
| LWBE3G | EMC: EN 55014-1/2 | Full EC range | Intertek (Guangzhou) | ✓ T1 Ready |
| LWBE3G | AMCA 210 performance test | 400/500/630 mm | LONGWELL Wind Tunnel | ✓ T3 Equivalent |
| LWFC | UL 507 / ETL | 146/180/225/280 mm | UL · Intertek | ✓ T1 Ready |
| LWFC | EN 60335 + EMC | All 10 sizes | TÜV Rheinland | ✓ T1 Ready |
| LWFC | Noise ISO 3744 | All sizes | LONGWELL Anechoic Lab | ✓ T1 Ready |
| LWAA | UL 705 / ETL | 400/500/630/800 mm | UL · Intertek | ✓ T1 Ready |
| LWAA | AMCA performance curves | 400/630/910 mm | LONGWELL Wind Tunnel | ◐ T2 Scheduled Q3 |
| LWM | UL 1004-1 / EN 60034 | Full 30W-2.2kW range | UL · TÜV SÜD | ✓ T1 Ready |
| LWM | EMC full band + FCC Part 15 | All EC models | Intertek · CESI | ✓ T1 Ready |
| LWM | L10 bearing life accelerated test | LWM-EC600/1100/2200 | LONGWELL Aging Lab | ✓ T1 Ready |
Top-3 North American Commercial RTU OEM
Publicly listed company, USD 3B+ annual revenue, operations across US / Canada / Mexico, with owned manufacturing plants in the southern US and northern Mexico. Products applied in 3-25 ton commercial RTUs, heat pumps and rooftop air handling units. Customer name disclosable under separate NDA. Data reconciled by LONGWELL PMO and the customer's procurement team.
Project Context & Pressures · 2023 Q1
- DOE 2023 mandate took effect — from 2023-01-01 the US DOE required commercial RTU fan system efficiency ≥ 67%. The customer's incumbent supplier could not deliver a compliant EC fan platform before the deadline.
- Urgent search for an alternative supplier — hard requirements: full coverage across 6 RTU platform sizes, fan system efficiency ≥ 67%, noise ≥ 5 dB(A) below the prior solution, complete UL+ETL certification with DV/PV passed, mass production no later than 2023 Q3.
- Industry development cycle out of control — competing suppliers quoted 12-18 month development cycles. The customer's product release window would be missed entirely, jeopardizing the 2023 selling season.
LONGWELL 90-Day NPI Timeline
| Window | Milestone | Actions |
|---|---|---|
| 2023-02 | Spec Lock | Customer engineering team visited LONGWELL HQ; 6-size spec review + risk assessment sign-off |
| 2023-03 | CFD + Design | CFD across all 6 RTU platforms + biomimetic blade profile + customized scroll-mounting interface |
| 2023-04 | Engineering Samples | 6-size samples delivered; customer factory DV initiated |
| 2023-06 | DV/PV Pass | All 6 sizes passed DV/PV first-attempt with zero rework |
| 2023-08 | MP Release | Mass-production process archived one month ahead of the Q3 deadline; first MP order placed |
Technical & Commercial Outcomes
| Metric | Required | Achieved |
|---|---|---|
| Fan System Efficiency | ≥ 67% (DOE 2023) | 70-72% |
| Noise Reduction (vs incumbent) | ≥ 5 dB(A) | 6.5 dB(A) |
| DV/PV Pass Rate | ≥ 95% | 100% first-attempt |
| Certification Delivery | UL + ETL 6 sizes | 100% delivered together |
| Mass-production Milestone | 2023 Q3 | 2023-08 (1 month early) |
| Annual production volume | — | 50,000+ units/year, stable for 30 months |
| Field quality incidents | — | Zero major incidents · bearing FPM ≤ 80 |
| Frame agreement | — | 3-year renewal in 2026 Q1 |
Commercial HVAC Engineering Support
LONGWELL provides commercial HVAC OEMs and BIM/MEP engineering teams with the tools and resources required to integrate LWBE3G + LWFC + LWAA + LWM — including application-specific selection tables, CFD service, BIM family library and reference BOMs.
| Tool | Purpose | Access |
|---|---|---|
| LONGWELLBUS Selector | Input AHU / RTU / FCU / evaporator-condenser operating point; returns 2-3 matching solutions with full P-Q-η curves + noise predictions + energy comparisons | Free download |
| Whole-Unit CFD Simulation | Customer uploads AHU/RTU geometry → LONGWELL simulates duct impedance, fan operating point, noise prediction, airflow uniformity | Free for project-intent |
| 3D CAD + BIM Family Library | LWBE3G + LWFC + LWAA full STEP/IGES/Parasolid + Revit RFA family files | Available after NDA |
| BMS Register Map Library | Full Modbus RTU + BACnet MS-TP register tables + Schneider/JCI/Honeywell/Siemens/Trane validated configs | Available after NDA |
| Energy Code Compliance Calculator | Excel: input RTU/AHU capacity + current AC configuration → calculates DOE/ErP compliance margin after EC replacement + energy savings + payback period | Free |
| Quiet FCU Design Guide | Office / healthcare / education FCU quiet engineering guide · 12 LONGWELL-validated reference designs | Project-intent on request |
Field Application Engineering
For strategic commercial HVAC customers, LONGWELL provides 1-4 week deployment at the customer facility — completing first-batch AHU/RTU/FCU integration, DV/PV witness, and mass-production process transition. Local engineers available from EU / NA / Middle East offices. In the Top-3 RTU OEM case, LONGWELL engineers visited the customer's facility three times within the first 30 days.
Commercial HVAC 90-Day NPI Process
If standard configurations don't fully match your AHU / RTU / FCU platform requirements, LONGWELL offers the same 90-day NPI cycle that delivered the flagship Top-3 North American RTU OEM case — structured, predictable, validated.
| Stage | Engineering Actions | Customer Involvement |
|---|---|---|
| S1 · Day 1-14 Spec Lock | Application operating parameters + BMS integration requirements + certification matrix + timing window | Provide AHU/RTU/FCU operating points + regulatory class + timing window · 1-2 conference calls |
| S2 · Day 15-45 Design | Whole-unit CFD + biomimetic blade profile + 3D structure + communication register mapping | LONGWELL leads. Customer receives CFD / 3D / BMS interface docs · one technical review |
| S3 · Day 46-70 Prototype | 3-5 engineering prototypes + customer factory integration + DV | 3-5 prototypes; LONGWELL application engineers on-site for DV support; BMS integration debug |
| S4 · Day 71-90 Release | DV/PV completion + mass-production archived + first-order delivery | DV/PV verification; 48h closed-loop on engineering issues; first order 30-200 units |
Commercial Terms
NRE Charge
USD 5,000-20,000 depending on complexity; 50% credited against the first mass-production order; Tier-1 customers negotiable.
Sample Fee
USD 150-600 per unit by size; 100% credited against mass-production order; stock standard models complimentary (limited quantity).
IP Ownership
Customer-specific design IP belongs exclusively to the customer; LONGWELL platform IP remains with LONGWELL.
First Order MOQ
50-200 units for standard models; first orders for new partnerships reducible to ~30 units to support internal validation.
Lead Time & Reliability Commitments
| Commitment | Terms |
|---|---|
| Standard Model — Stock | 1-3 days · mainstream models stocked |
| Standard Model — MTO | 15-30 days · 50-200 units MOQ |
| Custom Model (post-NPI) | 30-45 days |
| Standard Warranty | 12 months from customer factory receipt date |
| Extended Warranty (EC critical parts) | 18-24 months, negotiable per frame agreement |
| L10 Bearing Life Commitment | ≥ 60,000h @ 40°C · ≥ 40,000h @ 60°C |
| 8D Closed-Loop Response | 24h acknowledgment → 5 business day root cause → 15 business day corrective action + verification |
| Field Support | Serious quality events: LONGWELL engineer on-site within 48 hours |
| On-Time Delivery | ≥ 97% (12-month rolling average) |
| Payment Terms | First order T/T 30% advance + 70% against B/L · strategic customers L/C / OA 30-60 days / Sinosure-backed OA 30-90 days |
Three Engagement Paths
Three ways to move from this brochure to a working partnership. Pick the one that fits your current commercial HVAC project stage.
Quick Quote
Send 5 parameters (airflow / static pressure / noise / supply voltage / certification) → receive 1-2 matching solutions + performance curves + indicative quote within 24 hours.
Technical Deep Dive
Book a 30-minute online technical meeting → LONGWELL application engineer + sales manager join → we prepare an application-specific solution comparison (CFD / BMS integration / energy-code compliance).
Factory Audit + NPI Kickoff
Visit our Ningbo/Yuyao HQ → bilingual reception → production lines + QA lab + R&D center + customer hospitality. Optional simultaneous 90-day custom NPI kickoff.
Get in Touch
One supplier · Four series · Commercial HVAC code-ready
Engineered for the Critical. LONGWELL Fans Power Your Equipment. Full compliance with DOE 2023 · ErP Tier 2 · IECC 2024 · ASHRAE 90.1.