Nicotra Gebhardt DD / DDM Alternative — LONGWELL DDK / SDDK series
Looking for an alternative to Nicotra Gebhardt DD / DDM? LONGWELL's commercial centrifugal line mirrors the Nicotra naming 1:1 — DDK / SDDK series — with identical frame designation, dimensional interchangeability, belt-drive or factory EC-upgrade, AMCA-tested aerodynamics, at 40–55% lower landed cost and 15-day delivery vs 10–14 weeks ex-works Nicotra. This is the single highest-value naming-mirror battle in the commercial AHU segment.
DD / DDM
DDK / SDDK series
Specification Comparison
| Specification | Nicotra Gebhardt DD / DDM | LONGWELL DDK / SDDK series |
|---|---|---|
| Fan type | Forward-curved direct-drive (EC available) | Forward-curved direct-drive (EC available) |
| Impeller / frame | frame 9/9 – 15/15 · Ø225–355 mm | frame 9/9 – 15/15 · Ø225–355 mm Drop-in |
| Airflow range | 2,500–9,000 m³/h | 2,500–9,000 m³/h |
| Static pressure (max) | 450–700 Pa | 450–700 Pa |
| Power class | direct-drive EC / IE motor | direct-drive EC / IE motor |
| AMCA 210 static efficiency (peak) | 66% | 66% |
| Noise floor (Lw) | 74 dB(A) | 74 dB(A) |
| Voltage | 230 / 400 V · 380–480 V 3Φ | 230 / 400 V · 380–480 V 3Φ |
| Drive / motor | Direct-drive EC / IE motor | Direct-drive EC standard Match + EC option |
| Certifications | CE · UL · EAC · AMCA | CE · UL · cUL · TÜV · EAC · RoHS · REACH |
| Sample lead time | 4–10 weeks | 1–3 days |
| Series lead time (≤500 units) | 10–14 weeks | 15–30 days |
| Landed cost index (LONGWELL = 100) | 175–200 | 100 (baseline) |
Engineered match verified against Nicotra Gebhardt DDM 9/9 – DDM 15/15 (direct-drive EC) in LONGWELL's cross-brand model library (record: NAMING_MIRROR — DDK/SDDK225-I →). DDK/SDDK225-I → DDM 9/9; DDK/SDDK250-I → DDM 10/10; DDK/SDDK315-II → DDM 12/12; DDK/SDDK355-I → DDM 15/15.
Why Engineers Switch from DD / DDM to DDK / SDDK series
4–8× Faster Delivery
40–55% Lower Landed Cost
Belt or EC-Upgrade Path
Drop-In Compatibility Details
Frame & dimensional match
LONGWELL DDK / SDDK series carries the identical Ø225–355 mm frame designation as Nicotra DD / DDM — scroll dimensions, inlet cone, outlet flange, and shaft/bearing centres match 1:1, so it drops into the same AHU section, the same belt-guard, and the same pedestal without rework.
Drive & motor options
LONGWELL ships the DDK / SDDK series as direct-drive EC standard, matching the Nicotra DD / DDM direct-drive arrangement and adding 0–10 V / Modbus speed control for variable-volume AHU.
Performance match
The aerodynamic curve of LONGWELL DDK / SDDK series tracks the Nicotra DD / DDM within AMCA 210 test tolerance across the operating envelope (third-party tested). DDK/SDDK225-I → DDM 9/9; DDK/SDDK250-I → DDM 10/10; DDK/SDDK315-II → DDM 12/12; DDK/SDDK355-I → DDM 15/15. Performance is matched at the published duty point, with LONGWELL's documented cross-brand library backing the selection.
Typical Applications
The LONGWELL DDK / SDDK series is widely deployed across compact direct-drive AHU and rooftop / fan-coil units. Common application categories include:
- Compact direct-drive AHU
- Fan-coil & rooftop units
- Space-constrained plant rooms
The DD/DDM direct-drive line removes the belt entirely; LONGWELL DDK/SDDK mirrors the frame and ships EC as standard.
FAQ
Is LONGWELL DDK / SDDK series dimensionally interchangeable with Nicotra DD / DDM?
Does LONGWELL offer an EC-upgrade for the DD / DDM?
What's the 2026 lead-time and cost difference?
Why does LONGWELL use the same model naming as Nicotra?
Can I get the full Nicotra-to-LONGWELL commercial cross-reference?
Replace your DD / DDM in 5 days
Send a quick request — model + quantity + delivery address. Sample unit ships in 1–3 days for field validation. Series production at 15-day lead time after PO.
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