Ordinary 4-72
Use the published non-corrosive, non-sticky medium restrictions and actual duty curve.
EQUIPMENT / EQUIPMENT FAMILY
Jiayi 4-72 general ventilation and F/B variants
Centrifugal ventilation with stated medium limits; corrosion and explosion-protection variants require their own current material and conformity documents.
From Zhejiang Jiayi Fan · HVAC and refrigeration air movement
Individual product research · HVACDeck Editorial · Sources checked 2026-10-11
Select 4-72's duty without inheriting F/B variant approvals
Jiayi's original 4-72 spread describes centrifugal ventilation for air and other non-self-igniting, non-corrosive gases, without sticky matter, with dust/hard-particle content at most 150 mg/m³ and gas temperature not above 80 °C. It separately describes F4-72 corrosion-resistant and B4-72 explosion-protection variants. Those variants are not permission to use an ordinary 4-72 fan with any hazardous gas.
The original 3.6A, 2,900 r/min row gives 2,664–5,268 m³/h and 1,578–989 Pa total pressure with a 3 kW, 2-pole motor. The website transcription starts the pressure range at 578 Pa instead, losing a leading digit. This brief uses the actual original example while leaving the current issued revision to the supplier; it does not reproduce the website's simplified table as an approved selection.
Published parameters and their scope
This is an equipment family; its range does not identify one orderable configuration.
- Family designation
- 4-72 / F4-72 / B4-72
Swipe the table, or focus it and use arrow keys, to read the conditions and sources.
| Parameter | Published value | Conditions and evidence |
|---|---|---|
| General 4-72 medium limits | Gas ≤80 °C; dust/hard particles ≤150 mg/m³; no sticky substances | Original ordinary-fan description also excludes corrosive and self-igniting media; selected suitability needs the actual gas specification. Source |
| Original 3.6A / 2,900 r/min row | 2,664–5,268 m³/h; 1,578–989 Pa total pressure; 3 kW–2-pole | Printed page 27. Range endpoints are not independently combinable maxima; selected curve needed. Source |
| 3.6A source conflict | HTML pressure 578–989 Pa versus original 1,578–989 Pa | Actual source comparison; no undocumented current design correction assumed. Source |
| F4-72 described construction | Stainless steel or glass-fibre-reinforced material option | Supplier's variant description; specific grade, parts and gas compatibility not provided. Source |
| B4-72 certification wording | Supplier references CNEX 070481X | Certificate/listing, holder, covered models and current validity not independently reviewed; no platform certification endorsement. Source |
Selection and application review
Identify the medium before choosing ordinary, F or B construction
Send gas composition, temperature, moisture, sticky matter and particle concentration, with the intended ventilation process. The ordinary 4-72 source has explicit restrictions; it should not be selected merely because its airflow seems adequate. Ask the manufacturer for written suitability and operating limits for the actual medium.
F4-72 refers to corrosion-oriented materials, while B4-72 refers to explosion-protection construction. Neither label establishes universal chemical compatibility or permission for every explosive atmosphere. Have a competent design resolve hazardous-area requirements and request current exact-model conformity evidence. The platform does not approve hazardous applications.
Match speed, total pressure and volume on the same curve
The original table separates multiple speeds and associated motor/pressure ranges. Select the complete row and current fan curve at the required density and installed resistance. State whether the enquiry needs static or total pressure; this source labels total pressure. Maximum volume and maximum pressure should not be promised simultaneously.
The original 3.6A row's 1,578 Pa differs from the 578 Pa HTML value. Other abbreviated rows also vary. Freeze an issued revision in the quotation instead of interpolating or silently merging the values. Agree the allowable region, motor load margin and performance acceptance point with the supplier.
Approve the actual casing, material and protected assembly
For an F variant, obtain the exact impeller, casing, inlet and fastener material schedule, coating and exposure limits. 'Stainless steel or glass fibre' does not identify a grade or prove the entire assembly resists a chosen gas. For a B variant, require the complete fan/motor documentation, not only a catalogue sentence about an aluminium impeller and protected motor.
The printed historic certificate reference gives no independently reviewed scope/current status here. Verify legal holder, exact model, marking, conditions and validity with the issuing evidence before relying on it. Ordinary fan performance cannot be used as proof of a variant's safety qualification.
F4-72
Close exact corrosion-oriented materials and written compatibility for the medium.
B4-72
Obtain current complete-assembly protection evidence and qualified application review.
Use the correct mounting drawing and motor-inclusive weight
The spread provides inlet/outlet sizes and a separate outline/mounting table. Obtain the complete ordered fan size, direction, discharge orientation, drive and support drawing. Matching an inlet diameter alone does not fix the outlet flange, holes, footprint or removal clearance.
The original fan-weight column explicitly excludes the motor. Include the actual motor and base in support, handling and transport planning rather than calling that value the full assembly weight. Ask for balance, vibration, guarding, service access and the current installation/maintenance instructions.
Close the selected offer and sample acceptance
Require the issued curve, complete motor supply/nameplate, material/protection schedule, drawings, inspection records and operating limits in the order. Agree a sample or witnessed performance point with acceptable tolerances and sound/vibration evidence relevant to the installation. The source's general efficiency and service-life claims are not a platform test.
Obtain current price, production programme, packing, spare parts and warranty from the actual legal seller. The platform has not tested this fan, validated the historic protection certificate or verified stock. The brief organises the actual duty evidence and variant decisions instead of mass-publishing separate near-identical pages for each diameter or motor speed.
Sources and review scope
Compiled by HVACDeck Editorial. Source review identifies what the publication states; it is not an independent performance test or certification.
- Official Jiayi 4-72/F4-72/B4-72 pageChecked 2026-10-11 · Complete medium, variant and HTML-table statements read; source conflicts not concealed.
- Original centrifugal-fan performance/mounting spreadChecked 2026-10-11 · Printed pages 27–28 fully visually inspected. Actual pressure, multiple-speed rows, variant descriptions and motor-excluded weight reviewed; certification not independently validated.
Editorial method and corrections · Report a detail with this page URL
Turn the evidence into an enquiry
Send the manufacturer your required duty, installation conditions and the unresolved items identified in this brief.
Continue the selection
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