--- title: "Large-Diameter HVLS Ceiling Fan" url: https://tiercooling.com/product/large-diameter-hvls-ceiling-fan/ date: 2026-09-07 modified: 2026-10-09 lang: en author: "info@tiercooling.com" description: "HVLS-BIG — HVLS ceiling fan for high, open buildings — factory, warehouse, gym, farm, market and sports-hall air movement with energy-saving PMSM direct drive." image: https://tiercooling.com/wp-content/uploads/2026/09/projects-heavy-industry-hd-1024x768.jpg word_count: 998 --- # Large-Diameter HVLS Ceiling Fan **Large-diameter HVLS ceiling fans move more air with less energy than any other fan type.** The RDF range spans six swept diameters - 3.6, 4.2, 5.2, 6.2, 6.7 and 7.2 m (12-24 ft) - all on the same gearless PMSM servo direct-drive platform, from 4,522 to 15,197 m3/min at 0.66-1.3 kW. This page carries the complete model table so you can size by floor area rather than by price. ## Why projects specify this RDF HVLS fan - **Gearless PMSM servo direct drive.** The permanent-magnet synchronous motor is built into the hub - no gearbox, no oil, no seals to service. Independent conformity assessment covers EMC Directive 2014/30/EU and LVD 2014/35/EU for the drive motor. - **Very large air volume, very low input.** Up to 15,197 m3/min from 1.3 kW installed power, with typical consumption below 1 kWh per hour in normal operation. - **Quiet by design.** Six airfoil-section blades turn at 55-90 rpm, keeping sound below 38-39 dB(A) - quieter than typical office background noise. - **Engineered for safety overhead.** One-piece anodised aviation-grade Al-Mg blades with six reinforcement ribs and T6 heat treatment, on a 45# steel petiole with the patented starfish-claw triple-bolt anti-drop hub. - **IP64 sealed motor.** Dust- and splash-protected, brushless and maintenance-free, with a separate protection-grade test report on file. - **Smart vector control.** Infinitely variable speed, soft IPD start, RFI filtering and overload protection; the 7.2 m model has independent type-test reports for both 220 V and 380 V builds. ## Technical specifications | Model | Diameter | Power supply | Current | Power | Max. speed | Max. airflow | Noise | Net weight | Coverage | | ----- | -------- | ------------ | ------- | ----- | ---------- | ------------ | ----- | ---------- | -------- | | RDF-S3600 | 3,600 mm (12 ft) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 90 rpm | 4,522 m3/min | <38 dB | 72 kg | O 20-24 m | | RDF-S4200 | 4,200 mm (14 ft) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 80 rpm | 5,306 m3/min | <38 dB | 75 kg | O 22-26 m | | RDF-S5200 | 5,200 mm (17 ft*) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 70 rpm | 7,065 m3/min | <39 dB | 78 kg | O 25-30 m | | RDF-B6200 | 6,200 mm (20 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 65 rpm | 10,747 m3/min | <39 dB | 100 kg | O 32-37 m | | RDF-B6200 | 6,200 mm (20 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 65 rpm | 10,747 m3/min | <39 dB | 100 kg | O 32-37 m | | RDF-B6700 | 6,700 mm (22 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 60 rpm | 12,560 m3/min | <39 dB | 105 kg | O 35-40 m | | RDF-B6700 | 6,700 mm (22 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 60 rpm | 12,560 m3/min | <39 dB | 105 kg | O 35-40 m | | RDF-H7200 | 7,200 mm (24 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 55 rpm | 15,197 m3/min | <39 dB | 115 kg | O 38-44 m | | RDF-H7200 | 7,200 mm (24 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 55 rpm | 15,197 m3/min | <39 dB | 115 kg | O 38-44 m | Airflow at maximum speed per the manufacturer type test; running speed is infinitely variable. The 5.2 m model's printed "14 ft" in the source brochure is a brochure typo; the manufacturer's Chinese-market spec table lists 5.2 m = 17 ft, the correct conversion. ## Choosing the right diameter HVLS efficiency scales with diameter: a slow, wide column of air travels further and feels more natural than a fast narrow jet. Choose by coverage and mounting height: - **3.6 m / 4.2 m (O 20-26 m coverage)** - low-bay workshops, retail, gyms and dining areas with 4.5-7 m ceilings. - **5.2 m (O 25-30 m)** - the versatile default for general manufacturing, supermarkets and function halls. - **6.2 m / 6.7 m (O 32-40 m)** - warehouses, logistics centres and sports halls at 7-12 m. - **7.2 m (O 38-44 m, ~1,450 m2)** - high-bay storage, exhibition centres and large production bays. Every model uses the same blade aerodynamics, anodised Al-Mg construction, IP64 direct-drive motor and vector controller, so mixed installations - larger fans over open bays, smaller ones over offices or mezzanines - behave and sound the same. ## Backed by a specialist air-treatment manufacturer - 20+ years focused on evaporative cooling and large industrial fans; National High-Tech Enterprise and CRAA-listed manufacturer. - Deputy Director Unit of the national evaporative-cooling industry committee, with 40+ patents and self-developed, patented molds. - Product liability underwritten by CPIC (policy ADNGD0207121Q000109N); type-test, protection-grade and CE motor-conformity documentation supplied with export orders. - RDF equipment is published in service with automotive, food and electronics manufacturers including SAIC-GM-Wuling, FAW-Volkswagen, GAC Toyota/Honda, PepsiCo, Foxconn, Panasonic, Gree, Midea and Haier. ## Ordering the large-diameter RDF HVLS fan (3.6-7.2 m) - **MOQ:** 10 units - **Lead time:** 10 units in about 5 days; 100 units in about 20 days; 500 units in about 60 days - schedule varies by model and production plan, confirmed per order - **Trade terms:** FOB Shenzhen - **Payment:** T/T - 35% deposit, 65% balance paid before shipment - **Warranty:** 2-year warranty on the complete unit per the factory's warranty policy: motor 2 years, controller 2 years. Overseas spare-parts support (wear-parts list, quotation and dispatch lead time) is confirmed with your order. - **Documentation:** CE conformity reports for the PMSM drive motor (EMC 2014/30/EU, LVD 2014/35/EU), IP-rating report and 7.2 m type-test reports (220 V / 380 V) are available with your order. Send your floor dimensions, ceiling height and heat-load description (a sketch or photo is enough) - we reply with a model recommendation, layout and quotation within one business day via the [contact page](/contact/). ## Frequently asked questions ### Are larger fans better, or should I use more small fans? For open ceiling space one large fan beats several small ones on energy and uniformity: airflow scales with swept area while power grows slowly. Small fans only make sense where ceilings are low or the floor plan is divided into rooms. ### Do all sizes use the same motor? The 3.6-5.2 m models use a 0.66 kW PMSM unit (3.0 A); the 6.2-7.2 m models use 1.3 kW (4.4 A at 220 V / 3.0 A at 380 V). Both are brushless, gearless and IP64 with the same vector-drive family. ### What ceiling height is required? Roughly 4.5-15 m; blade tip should remain at least 3 m above occupied floor level in comfort applications. Tell us your height and we confirm model and drop-rod length. ### Can I mix single-phase and three-phase fans in one building? Yes. The 6.2-7.2 m models come in both supplies with the same controller interface, so a site can mix 380 V fans in production areas with 220 V units in offices or retail zones. ## Related products - [7.2 m HVLS Fan (PMSM Direct-Drive)](/product/7-2m-hvls-ceiling-fan-pmsm-direct-drive/) - [HVLS Fans for Factories](/product/hvls-fans-for-factories/) - [HVLS Fans for Gyms & Sports Halls](/product/hvls-fans-for-gyms-sports-halls/) - [HVLS Fans for Markets & Malls](/product/hvls-fans-for-markets-malls/) ## More from TierCooling - [View installed project references](/projects/) - [About the manufacturer](/about/) - [All products in this category](/product-category/hvls-ceiling-fans/) ## FAQ ### What does HVLS mean? High Volume, Low Speed: large-diameter ceiling fans that move a very large air volume at low rotational speed, covering big floor areas with gentle, even airflow instead of concentrated high-speed blasts. ### Why choose a PMSM direct-drive HVLS fan? Permanent-magnet synchronous motors with direct drive run at high efficiency with fewer wearing parts than geared designs - meaning lower energy use, quieter operation and less maintenance over the fan's life. ### Which sites use HVLS ceiling fans? Typical applications include factories, warehouses, gyms and sports halls, markets and malls, playgrounds and sports fields, and livestock farms - any large space where uniform airflow and lower energy cost matter. ### How is fan size and unit count decided? Selection comes from floor area, mounting height and the obstruction layout of the site; suppliers model diameter and placement from drawings so airflow reaches working zones evenly.