Greenheck now splits its DS installation manuals by ship date: before January 1, 2026, and everything after [3][4]. Write that date in the service record. The DS already hanging in a warehouse may need a different manual from the redesigned DS-3 or DS-6 on your next order.
Greenheck announced the redesign in December 2025 [1][2]. For a contractor pricing the work, the install and controls changes matter more than the airflow headline.
Start with the manual number
Both product pages list Model DS #487917 IOM separately from Model DS #483568 IOM, which is marked "Shipped prior to 1/1/26." The older DS-QD supplement and VFD wiring document, #483972, is also marked for fans shipped before that date [3][4].
Get the full model and serial number, then pull the matching install manual and the manual for the controller that shipped with it. Greenheck has separate manuals for its 4-speed, multispeed, keypad and touchscreen controls. Don't wire an older fan off a new controller diagram just because both say DS. The cutoff date tells you which document applies. It doesn't tell you every part changed that day.
See what shows up already assembled
Greenheck says the redesign brings a factory-assembled power pack, plug-and-play wiring, a field-adjustable extension tube, and automatic commissioning and diagnostic modes [1]. It also says the changes can cut install time in half. The announcement doesn't say how many jobs, what crew size or what site conditions that figure came from.
For your estimate, hold the shipped instructions up against the building. Figure out which connections arrive done, what your crew supplies and wires, and whether the extension tube setup meets the approved mount and clearances. The half-time claim is Greenheck's. Don't bid labor off it.
Compare the sizes you're actually ordering
The DS-3 has three blades and the DS-6 has six. Both come in 8- to 24-foot diameters in the U.S. Greenheck lists maximum airflow of 209,800 cfm for the DS-3 and 281,700 cfm for the DS-6 [3][4]. Those are the top of each range, not two same-size fans at the same speed. To compare 16-footers, pull the tables for the two 16-foot configurations.
Greenheck also advertises a perceived cooling effect of up to 11°F for the DS-3 and 15°F for the DS-6 [3][4]. Those are manufacturer claims, so ask for the test conditions behind them. The building's actual temperature doesn't drop that much.
The company says CFEI can run up to 83% above DOE's minimum [1]. When we checked the federal rule in November 2026, the minimum for covered large-diameter fans was 1.00 at high speed and 1.31 at 40% speed, or the nearest higher available speed [5][6]. Compare the exact model's declared rating at the matching speed. "Percent above minimum" doesn't rank it against other brands or predict comfort on the floor.
Nail down the controller and how it behaves
The announcement lists Modbus RTU, BACnet MS/TP and 0–10 VDC [1]. The submittal should say which one the package you're buying supports, whether it needs extra hardware, and what happens on stop, power loss and restart, plus any fire-alarm shutdown.
Commissioning access, wiring, shielding, termination and addressing all belong in that same review. A list of protocol names leaves too much for the electrician and the integrator to guess.
Greenheck also lists IP66 protection, a top operating temperature of 130°F (55°C), and indoor and outdoor mounting [1][3][4]. Check those against the exact assembly, and check separate controllers, connectors and field terminations on their own. One part's rating doesn't cover the whole install.
Settle the structural attachment, suspension, clearances, power supply, controller and interlocks before you assign labor. Keep the commissioning results and as-left settings with the right manual. You'll want them on the next service call for the older fan hanging next to the new one.
Sources
[1] Greenheck, Greenheck Redesigns HVLS Overhead Fans, manufacturer announcement dated December 2025 (page URL dated December 31, 2025): https://www.greenheck.com/about-us/news/2025/12/31/greenheck-redesigns-hvls-overhead-fans
[2] Industrial Equipment News, HVLS Overhead Fans, published January 9, 2026: https://www.ien.com/new-products/product/22958169/greenheck-hvls-overhead-fans
[3] Greenheck, DS-3 Overhead HVLS Fan, current manufacturer product page, checked November 10, 2026: https://www.greenheck.com/products/fans/overhead-hvls/ds-3
[4] Greenheck, DS-6 Overhead HVLS Fan, current manufacturer product page, checked November 10, 2026: https://www.greenheck.com/products/fans/overhead-hvls/ds-6
[5] eCFR, 10 CFR 430.32(s)(2)(ii), current federal LDCF CFEI requirements: https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-C/section-430.32
[6] eCFR, Appendix U to Subpart B of 10 CFR Part 430, federal test-procedure definitions: https://www.ecfr.gov/current/title-10/chapter-II/subchapter-D/part-430/subpart-B/appendix-Appendix%20U%20to%20Subpart%20B%20of%20Part%20430