EQUIPMENT / EQUIPMENT FAMILY

Gerui 4-72 centrifugal fans · Duty, transmission and catalogue consistency

Compare A/C arrangements at one defined air duty, keeping source medium limits and table defects attached to the enquiry.

From Gaobeidian Gerui · General and process-air fan manufacture

Individual product research · HVACDeck Editorial · Sources checked 2026-10-11

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Manufacturer catalogue image · 4-72; A/C arrangement alternatives

01 / UNDERSTAND THE EQUIPMENT

Specify the airflow and drive as one selected assembly

Gerui's 4-72 centrifugal offer is presented on A- and C-arrangement pages. The reviewed C-family photograph shows a volute casing on a base with an external shaft/transmission enclosure, while the A picture is a compact motor-mounted assembly. They are consolidated into one 4-72 family because transmission and size alternatives should be selected together, rather than creating near-duplicate capacity or speed pages.

The official body permits ordinary air or other stated noncorrosive, nonflammable, nonsticky streams, with gas temperature no higher than 80°C and dust/hard-particle concentration no more than 150 mg/m³. Its schedules provide speed, paired flow/total-pressure ranges and motor columns. Some cells contain malformed motor text or multiple alternatives. A separate page headed 4-42 actually displays 4-72 tables; that mismatch is excluded as independent 4-42 evidence. This brief retains usable rows while requiring a current selected curve, drive arrangement and drawing.

02 / READ THE CONDITIONS

Published parameters and their scope

This is an equipment family; its range does not identify one orderable configuration.

Family designation: 4-72; A/C arrangement alternatives

Swipe the table, or focus it and use arrow keys, to read the conditions and sources.

Manufacturer-published values · conditions are part of the specification
Parameter	Published value	Conditions and evidence
Official medium boundary	No corrosive, flammable, volatile or sticky gas; stated ordinary-air duty	Supplier description, not an independently verified special-gas construction. Source
Published gas limits	≤80°C; dust/hard particles ≤150 mg/m³	Exact 4-72 description; not a dust-collector or abrasive-material guarantee. Source
C-family No.6C example	1600 r/min; Y132S-4 5.5 kW; 7367–14734 m³/h; total pressure 1389–881 Pa	Exact original row; selected point and air-reference/test basis still needed. Source
A-family No.6A example	1450 r/min; Y112M-4 4 kW; 6677–13353; total pressure 1139–724 Pa	Original A table has malformed flow-unit typography; supplier must confirm units and selected point. Source
Arrangement evidence	C photograph: external transmission area; A photograph: compact motor-mounted assembly	Family images read; precise drive, rotation and outlet position require issued drawings. Source
Catalogue defects retained	Blank A size cell, malformed C motor strings; 4-42 page contains 4-72 tables	No guessed correction or separate 4-42 product claim. Source

Selection and application review

Select one point within the flow/pressure range

The No.6C 1600 r/min row lists 7367–14734 m³/h and 1389–881 Pa total pressure with a 5.5 kW Y132S-4. Those ranges do not mean the fan supplies maximum flow at maximum pressure simultaneously. Ask for the complete curve and a marked operating point against the actual system resistance.

Specify air conditions and whether the designer's requirement is static or total pressure. The source total-pressure table does not directly prove external static available at the installed duct terminals. Obtain a current selection and complete electrical-input basis; the motor kW column alone is not measured running consumption.

Compare A and C at equal duty and installed scope

The No.6A source row at 1450 r/min has a 4 kW Y112M-4 and different flow/pressure values from the C example. This is not an equal-duty efficiency comparison. Ask the supplier to select both proposed arrangements at the same defined flow, pressure and entering-air conditions.

Obtain the ordered transmission, motor speed, fan speed, drive guarding and service requirements. The family photographs show different external arrangements but do not establish a particular pulley ratio or maintenance interval. Include base/supports, vibration isolation, access and any starter or speed controller in the quotation comparison.

Keep contamination and temperature within the disclosed scope

The official description limits temperature to 80°C and dust/hard particles to 150 mg/m³, and excludes sticky and several hazardous/corrosive gas characteristics. Issue the actual contaminants and operating extremes. If the gas falls outside that scope, require a different documented selection rather than treating the general 4-72 family as a universal process-exhaust fan.

The dust limit is not an independently tested impeller-wear life or proof that a material-conveying system is suitable. Ask for the selected material, finish, inspection and cleaning provisions appropriate to the actual service. No special coating or certification is inferred from blue/red paint in the image.

Resolve source errors before approving dimensions or motors

The A table has a genuinely blank size entry among its rows. The C table includes malformed motor strings and cells listing two motor alternatives without a complete point mapping. The separately titled 4-42 page includes tables headed 4-72 B/C/D. Those errors are not silently fixed or used to extend this family into a new product claim.

Require a dated selected row, exact motor, rotation/outlet position, flange and foundation drawing, and the accepted test schedule. Agree balancing, mechanical run and duty verification for the ordered unit. Current price, delivery and witnessed efficiency remain unknown; the same family covers the actual transmission choices without multiplying nominal sizes into URLs.

Set a comparable duty
Provide paired flow/pressure, air conditions and source medium limits.
Approve the drive and layout
Name fan/motor speeds, transmission, guards, outlet/rotation and service space.
Close catalogue conflicts
Obtain corrected selection/drawings and ordered-unit acceptance records.

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 4-72 C arrangement and tableChecked 2026-10-11 · Full body, original family image and No.6C–10C HTML schedule reviewed.
Official 4-72 A arrangement and tableChecked 2026-10-11 · Full body and original table/image reviewed; blank size and flow-unit typography retained.
Official page headed 4-42Checked 2026-10-11 · Full page inspected: schedule headings are 4-72. Excluded as evidence for a separate 4-42 product.

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