Which LONGWELL model replaces the Delta AFB1212 (120 mm) or PFB1212 high-pressure fan?

A 120×120×25/38 mm Delta AFB1212 (standard) or PFB1212 (high-static, up to ~253 CFM / ~1.4 inH2O) maps to the LONGWELL 120 mm DC axial family (12025 / 12038) in the matching speed/pressure grade. LONGWELL offers standard, high-CFM and high-static 120 mm variants; confirm the exact grade against your required CFM/Pa rather than a single catalog figure, then validate by sample.

What is the 2026 lead time and cost difference vs Delta?

As of 2026, catalogued Delta DC fans ship quickly from distribution but non-stock, high-power or customised parts commonly run several weeks. LONGWELL ships samples in 1–3 days and series orders in 15–30 days. At equivalent same-size specification (airflow/Pa, voltage, control, bearing), LONGWELL typically lands 30–55% below Delta pricing; final pricing depends on quantity, size, thickness, voltage and control options.

Delta Fan

Delta Fan Cross-Reference — LONGWELL DC Axial Cooling Fan Replacement (40–254 mm)

Delta Electronics is the reference brand for DC brushless axial cooling fans in servers, telecom, power conversion, industrial and automotive equipment. LONGWELL builds a same-size DC axial cooling fan across the full Delta size range — 40, 60, 80, 92, 120, 172 and 254 mm, matching the AFB, AFC, GFB, FFB, PFB and THA/THB families — as same-size replacement candidates with the same mounting-hole pattern, the same 5/12/24/48 V DC supply and the same PWM and FG/tach control. Final model (thickness, airflow/static, connector, IP) is matched to your duty point and validated by a 1–3 day sample, at 30–55% lower landed cost and a 15–30 day series lead time.

Cross-references: Delta AFB / AFC / GFB / FFB / PFB / THA / THB Sizes: 40 · 60 · 80 · 92 · 120 · 172 · 254 mm Voltage: 5 / 12 / 24 / 48 V DC Sample: 1–3 days

Direct answer

Yes — LONGWELL can provide replacement candidates for many mainstream Delta DC axial cooling fan applications across the full size range. LONGWELL builds the same square frames (40 → 254 mm) with the same mounting-hole spacing, the same 5/12/24/48 V DC supply and the same PWM/FG control, so a same-size LONGWELL fan fits the same slot mechanically and electrically. Final model is confirmed by duty point, voltage/control, mounting and project validation via a 1–3 day sample.

Replacing

Delta Electronics
AFB · PFB · THB …

DC axial cooling fans · 40–254 mm · 12/24/48 V DC · PWM/FG

→

With

LONGWELL
DC Axial Range

Same-size DC axial · 40–254 mm · 5/12/24/48 V DC · PWM/FG · replacement candidate

Cross-Reference by Frame Size

DC axial cooling fans are defined by frame size, thickness, voltage and connector — so cross-referencing runs by size class. For each Delta frame below, LONGWELL builds a same-size DC axial fan. Delta figures are typical maxima from public datasheets (2026); LONGWELL variants are offered in standard, high-CFM and high-static grades to meet the same envelope. Confirm the exact model against your required airflow/static (CFM/Pa) and validate by sample.

Frame size	Delta series (typical)	Delta envelope (max)	LONGWELL match	Fit
40×40×10–28 mm	AFB0412 · AFC0412 · GFB0412 (high-P)	12/24/48V · ~5–25CFM · to ~15,000rpm	LONGWELL 4010 / 4028 (5–24V, ball bearing, to 15,000rpm)	same size
60×60×15–25 mm	AFB0612 · AFC0612	12/24/48V · ~20–40CFM	LONGWELL 6025 DC axial (square/round)	same size
80×80×20–38 mm	AFB0812 · AFC0812 · PFB0812	12/24/48V · ~30–75CFM	LONGWELL 8020 / 8025 / 8038 (5/12/24/48V, FG/RD)	same size
92×92×25–38 mm	AFB0912 · AFC0912 (high static)	12/24/48V · to ~110CFM · to ~1,100Pa	LONGWELL 9225 / 9238 (12/24/48V, PWM to 25kHz, waterproof)	same size
120×120×25–38 mm	AFB1212 · GFB1212 · PFB1212 (high-P)	12/24/48V · AFB to ~130CFM · PFB1212UHE ~253CFM / 1.41inH2O	LONGWELL 12025 / 12038 (standard / high-CFM / high-static)	same size
172×150×51 mm	FFB1712 · PFB1712 · THA1748	48V · high-power server / telecom class	LONGWELL 172×150×51 DC axial (built to order) · 17251 (172×172×51) / 17238 (172×172×38) catalog frames	same size
Ø172×51 mm	THB1748	48V · to ~600CFM / ~3.8inH2O · PWM + tach	LONGWELL 17251 DC axial · Ø200 external-rotor EC/DC for THB1748-class duty	size + duty match
254×254×89 mm	THA2549 · QFR2549	48V · high-CFM inverter/telecom	LONGWELL 254 mm DC axial (NSK bearing) · Ø250 external-rotor	size + duty match
Blowers	BFB · BUB radial blowers	12/24/48V · high-static compact	LONGWELL DC centrifugal / mini blower	by duty point

Delta model numbers and envelopes above are drawn from public Delta datasheets (delta-fan.com / deltaww.com, 2026). LONGWELL is not affiliated with or endorsed by Delta Electronics; see notice below.

Model-by-Model Cross-Reference (Verified Datasheet Anchors)

The most-deployed Delta part numbers, mapped to the specific LONGWELL model. Delta figures below are quoted directly from public Delta datasheets (delta-fan.com, 2026); the LONGWELL grade is selected to meet the same envelope and confirmed by sample at your duty point.

Frame	Delta Model	Delta datasheet figures	LONGWELL Replacement	Fit
120×120×25 mm	AFB1212H	12V · 2,500rpm · 82.7CFM · 0.246inH2O	LONGWELL 12025 · standard grade	same size
120×120×25 mm	AFB1212HJ-00	12V · 4,300rpm · 119.2CFM · 0.476inH2O · PWM + tach	LONGWELL 12025 · high-speed grade, PWM/FG	same size
120×120×25 mm	AFB1224M	24V · 2,200rpm · 2.88W	LONGWELL 12025 · 24V standard grade	same size
120×120×38 mm	AFB1212VHE	12V · 3,200rpm · 130.0CFM · 0.420inH2O · tach	LONGWELL 12038 · high-CFM grade, FG	same size
120×120×38 mm	PFB1212GHE	12V · 4,800rpm · 32.4W · high static	LONGWELL 12038 · high-static grade	same size
120×120×38 mm	PFB1212UHE	12V · 5,500rpm · 48W · 252.9CFM · 1.412inH2O	LONGWELL 12038 · high-static top grade	same size
92×92×25/38 mm	AFB0912 · AFC0912 (high static)	12/24/48V · high-CFM / high-static 92mm class	LONGWELL 9225 / 9238 · matched by duty	same size
80×80×20–38 mm	AFB0812 family	12/24/48V · standard–high-CFM 80mm class	LONGWELL 8020 / 8025 / 8038 · matched by duty	same size
Ø172×51 mm	THB1748BG / THB1748BGP6	48V · 8,000rpm · 3.5A / 168W · 607.1CFM · 3.828inH2O · PWM + tach	LONGWELL 17251 (172×172×51mm, 12/24/48V, 2,500–6,000rpm, 183.3–456CFM) · Ø200 platform for THB1748-class duty	size + duty match
254×254×89 mm	THA2549 family	48V · high-CFM inverter / telecom class	LONGWELL 254 mm DC axial (NSK bearing)	size + duty match

Don't see your Delta part number? Every AFB/AFC/GFB/FFB/PFB/THA/THB part follows the size + grade logic above — email sales@longwellfans.com with the part number and we return the verified LONGWELL equivalent within 24 hours.

Delta Series Decoder → LONGWELL Equivalent

Delta encodes airflow/pressure class in the series prefix. Match the class, not just the size:

Delta prefix	What it means	LONGWELL equivalent grade
AFB	Standard axial DC brushless	Standard-grade DC axial (same size)
AFC	Higher speed / higher airflow axial	High-CFM grade DC axial
GFB / PFB	High static pressure (counter-rotating / deep frame)	High-static grade DC axial (38 mm deep / dual-stage on request)
FFB	Free-flow / high-airflow	High-CFM grade DC axial
THA / THB	172 / 254 mm high-power server & inverter	LONGWELL 17251 / 254 mm DC axial · Ø200/Ø250 external-rotor EC/DC
BFB / BUB	Radial (centrifugal) blowers	LONGWELL DC centrifugal / mini blower
Suffix P / F / D	PWM · FG/tach · alarm (RD)	PWM (to 25 kHz) · FG/tach · RD alarm — same control options

Why Switch from Delta to LONGWELL

Full Size-Range Coverage

40–254 mm

A same-size DC axial fan for every standard Delta frame — 40, 60, 80, 92, 120, 172 and 254 mm — same mounting holes, same voltage, same PWM/FG control. Same-size replacement candidate; confirm the exact grade by duty point.

Faster Samples & Series

1–3 days

Sample units in 1–3 days for field validation; series production in 15–30 days after PO — versus multi-week lead times on non-stock, high-power or customised Delta parts.

30–55% Lower Landed Cost

−30–55%

At equivalent same-size spec (airflow/Pa, voltage, control, bearing). Final pricing depends on quantity, size, thickness, voltage and control options.

Mechanical & Electrical Fit

Same frame & mounting holes

LONGWELL builds each fan on the standard square (or round) DC axial footprint — 40×40, 60×60, 80×80, 92×92 and 120×120 mm — with the same corner mounting-hole spacing as the Delta part, so a same-size LONGWELL fan drops into the same mounting slot with no bracket change. In the 172/254 mm high-power classes LONGWELL builds the 172×172×51 (17251) and 172×172×38 (17238) catalog frames, the rectangular 172×150×51 frame built to order — a same-size fit for THA1748/FFB1712-class Delta fans — and 254 mm frames; Delta's round Ø172 (THB1748) is matched by duty with a mounting check. Confirm thickness (10/15/20/25/38/51 mm) against the specific Delta model.

Same supply & control

LONGWELL DC axial fans run on 5/12/24/48 V DC — the same rails as Delta — and offer the same control and feedback options: PWM (to 25 kHz), FG/tach speed sensor and RD alarm output, on 2/3/4 lead-wire configurations. Match the connector and control wiring to the specific Delta part being replaced.

Performance match

Match on airflow, static pressure, noise and rated life at the same operating point — not on a single headline figure. For high-static Delta parts (PFB / GFB) select the high-static LONGWELL grade; for high-airflow parts (AFC / FFB) select the high-CFM grade. Validate the exact model against your required CFM/Pa by sample.

Typical Applications

LONGWELL DC axial cooling fans serve the same equipment-cooling roles as Delta fans across:

Servers, switches & networking / telecom enclosures
Power conversion, inverters, EV chargers & UPS cabinets
Industrial control, drives & automation equipment
Automotive, bus & condenser cooling
Medical devices, projectors, signage & CPU/GPU cooling

Match the exact LONGWELL model to the airflow/static, thickness and IP rating your equipment requires.

FAQ

Can LONGWELL replace Delta Electronics cooling fans?

Yes. LONGWELL can provide replacement candidates for many mainstream Delta DC axial cooling fan applications across the full size range — 40, 60, 80, 92, 120, 172 and 254 mm (AFB, AFC, GFB, FFB, PFB and THA/THB). LONGWELL builds the same frame sizes with the same mounting-hole pattern, the same 5/12/24/48 V DC supply and the same PWM and FG/tach control, so it fits the same slot mechanically and electrically. Final model (thickness, airflow/static, connector, IP) is confirmed by duty point, voltage/control, mounting and project validation via a 1–3 day sample.

Is the LONGWELL fan a drop-in for Delta by size?

For each standard square Delta frame — 40×40, 60×60, 80×80, 92×92 and 120×120 mm — LONGWELL builds a same-size DC axial fan with the same footprint, mounting-hole spacing, lead-wire/connector options and voltage, so it drops into the same mounting slot. In the 172 and 254 mm high-power classes LONGWELL builds 172×172×51 and 172×172×38 catalog frames plus the rectangular 172×150×51 frame built to order, and 254 mm frames; round Ø172 Delta frames are covered as duty matches with a mounting check. Match the exact model to the required CFM/Pa and thickness, then validate by sample.

Which LONGWELL model replaces the Delta AFB1212 or PFB1212 (120 mm)?

A 120×120×25/38 mm Delta AFB1212 (standard) or PFB1212 (high-static, up to ~253 CFM / ~1.4 inH2O) maps to the LONGWELL 120 mm DC axial family (12025 / 12038) in the matching speed/pressure grade. Confirm the exact grade against your required CFM/Pa, then validate by sample.

Which LONGWELL model replaces the Delta THB1748 / THA1748 (172 mm)?

The Delta THB1748/THA1748 172 mm high-power fan (48 V DC, up to ~600 CFM, ~3.8 inH2O, PWM + tach) maps to the LONGWELL 172 mm DC axial platform — catalog 17251 (172×172×51 mm, 12/24/48 V DC, 2,500–6,000 rpm, 183.3–456 CFM) and 17238 (172×172×38 mm), plus the rectangular 172×150×51 frame built to order — so THA1748/FFB1712-class rectangular fans are same-size replacement candidates. Round Ø172 THB1748-class duty (~600 CFM) is covered by the LONGWELL Ø200 external-rotor EC/DC platform. Confirm airflow/static, control and mounting against the specific part and validate by sample.

What is the 2026 lead time and cost difference?

LONGWELL ships samples in 1–3 days and series orders in 15–30 days, versus multi-week lead times on non-stock, high-power or customised Delta parts. At equivalent same-size specification, LONGWELL typically lands 30–55% below Delta pricing; final pricing depends on quantity, size, thickness, voltage and control options.

Cross-reference your Delta fan — sample in 1–3 days

Send the Delta part number + quantity + delivery address, or your duty point (CFM/Pa, voltage, size). We return the matching LONGWELL model and ship a sample in 1–3 days for field validation. Series production at 15-day lead time after PO.

📧 Request Cross-Reference + Sample View Full Cross-Reference Table