# LONGWELL (www.longwellfans.com)

> Ningbo Longwell Electric Technology Co., Ltd. — LONGWELL — designs and manufactures EC and AC fans, blowers and motors in Yuyao, Ningbo, China since 1990, building its own motors and drive electronics, for HVACR, data-centre, heat-pump, refrigeration and industrial ventilation OEMs; exports to 30+ countries. This site covers the company, applications, engineering guides and competitor cross-references; the technical catalogue with every model, curve and drawing is the Fan Selector at https://select.longwellfans.com/.

## Start here
- Fan Selector — every model that covers a duty point (airflow + static pressure): https://www.longwellfans.com/fan-selector/ → https://select.longwellfans.com/
- Cross-reference guide (ebm-papst, Ziehl-Abegg, Nicotra Gebhardt, Rosenberg, Sanyo Denki → LONGWELL), with the full table on the hub page: https://www.longwellfans.com/resources/cross-reference-guide/
- ebm-papst R3G alternative guide (R3G190–R3G630, K3G, ZAplus): https://www.longwellfans.com/resources/guide/ebm-papst-r3g-alternative-guide/
- Product ranges: https://www.longwellfans.com/fans-and-blowers/
- Contact / RFQ: https://www.longwellfans.com/support/contact/

## Facts
- Founded 1990 · Yuyao, Ningbo, China · 36 years of fan and motor manufacturing · exports to 30+ countries
- Samples of stock models in 1–3 days · series production 15–30 days · warranty 12 months
- EC vs AC energy saving: about 30% across the load curve, more at part load — calculated per duty point
- Air performance tested to AMCA 210/211 (ISO 5801) methods; third-party test report on request; AMCA Certified Ratings Program registration in progress
- ISO 9001 / 14001 / 45001; CE (LVD, EMC); RoHS; ETL Listed by Intertek (UL 507 / CSA C22.2 No. 113) on selected single-phase EC and DC lines; CCC for China
- Technical support offices in Europe, North America and the Middle East (Dubai)

## Product categories (main site)
- Centrifugal fans: https://www.longwellfans.com/product-category/centrifugal-fans/
- Backward-curved centrifugal fans: https://www.longwellfans.com/product-category/centrifugal-fans/backward-curved-centrifugal-fans/
- Plug fans: https://www.longwellfans.com/product-category/plug-fan/
- Axial fans: https://www.longwellfans.com/product-category/axial-fans/
- Cross flow fans: https://www.longwellfans.com/product-category/cross-flow-fans/
- Duct fans: https://www.longwellfans.com/product-category/duct-fans/
- Commercial fan blowers: https://www.longwellfans.com/product-category/commercial-fan-blower/

## Guides and resources
- Resources hub: https://www.longwellfans.com/resources/
- Calculators and tools: https://www.longwellfans.com/resources/tools/
- Engineering cases: https://www.longwellfans.com/category/engineering-cases/
- Fan engineering guides: https://www.longwellfans.com/category/videos/fan-engineering-guides/
- Customer visits and global collaboration: https://www.longwellfans.com/customer-visits-global-collaboration/

## Machine-readable
- Cross-reference JSON: https://select.longwellfans.com/wp-json/lws/v1/xref
- Library stats: https://select.longwellfans.com/wp-json/lws/v1/stats
- Sitemaps: https://www.longwellfans.com/sitemap_index.xml · https://select.longwellfans.com/sitemap_index.xml