4-68 Centrifugal Ventilation Fan
The 4-68 series supports industrial air supply, workshop exhaust, warehouse ventilation and large-building air exchange across a broad selection of fan sizes and drive arrangements. Select from actual airflow, pressure, medium and installation conditions.
Large-Range General Industrial Ventilation
The 4-68 centrifugal fan serves ordinary factory air exchange, general equipment ventilation and supply or exhaust of clean air or non-corrosive gas. The available arrangement depends on fan size, duty point and installation. It is not a universal solution for corrosive, abrasive, explosive or high-temperature service.
Ventilation for production buildings and large workspaces where the selected fan covers actual duct losses.
Industrial indoor air exchange and general supply or exhaust, with system resistance reviewed at selection.
Equipment-room ventilation and air replacement under ordinary working-medium conditions.
Match model, operating point, original motor, installation, rotation and outlet orientation instead of replacing only by name.
A, C, D and B Transmission Options
The original 4-68 product page identifies four drive directions and their preliminary fan-size grouping. Final manufacturing details and bearings must be verified against the selected model’s catalogue drawing.
Small group, reference 2.8A–5A; compact impeller-on-motor configuration for suitable general ventilation duty.
Medium reference group around sizes 6.3–12.5; supports speed matching and motor positioning.
Medium reference group around sizes 6.3–12.5; fan shaft, drive components and installation require model-specific review.
Large group, reference 16B–20B. Review installation, foundation, motor and maintenance requirements.
4-68 Catalogue Range Summary
The summary below presents the published 4-68 series range. The limits represent the whole series, not a guaranteed operating point for one fan or one speed.
| Parameter | Catalogue Reference | Selection Note |
|---|---|---|
| Model designation | 2.8A–20B | Confirm exact size and transmission |
| Drive arrangement | A / C / D / B | Depends on size, speed and installation |
| Reference speed | 250–2900 r/min | Compare pressure and airflow at the same operating point |
| Reference motor rating | 0.55–220 kW | Final installed motor after engineering review |
Check the Working Medium Before Using 4-68
Ordinary clean air, non-corrosive industrial gas and normal building/workshop ventilation when airflow and duct resistance match.
Abrasive particles, significant dust, sticky substances, corrosive chemical gas, high-temperature gas, explosive atmosphere or extreme pressure demand.
What to Send for 4-68 Selection
Provide design airflow, total or static pressure, working-medium composition, normal and maximum temperature, site altitude, electric supply, rotation direction, outlet angle, quantity and installation dimensions. For a replacement, include existing nameplate, motor details, drawings and site photos.
How do 4-68 and 4-72 differ?
Both serve general industrial ventilation, but the current 4-68 source describes a broader 2.8A–20B and A/C/D/B configuration; the current 4-72 source identifies 2.8A–12C and A/C/D. Select from the actual operating point, not only model range.
Can the fan be sized from motor power only?
No. Airflow and pressure must be matched to the same fan-curve operating point and the full system resistance.
Does the reference motor range specify the motor for my project?
No. It is a whole-series reference range. The selected motor must be calculated and confirmed for the final impeller, speed, medium and operating point.
Get a 4-68 Fan Selection
Send the project requirements so we can review the suitable fan size, drive, motor and outlet arrangement.