Axial flow fan · general and explosion-proof configurations
T35-11 / BT35-11 Axial Flow Fan
T35-11 / BT35-11 axial flow fan is a direct-drive industrial ventilation fan designed for large airflow and low-resistance air exchange. It is suitable for workshop ventilation, warehouse exhaust, equipment-room cooling, wall-mounted exhaust and short-duct ventilation systems.
T35-11 is used for general industrial ventilation. BT35-11 can be configured with an explosion-proof motor and related electrical components for projects requiring explosion-proof ventilation. Final model selection should be confirmed according to airflow, pressure, voltage, installation method, medium condition and explosion-proof requirement.
Straight-through axial airflow · direct-drive structure · wall, duct or support-frame installation.
Configuration difference
T35-11 General Type vs BT35-11 Configuration
The T35-11 / BT35-11 axial fan moves air in the same direction as the fan axis. Its direct-drive structure is suited to compact installations with relatively low system resistance.
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| Item | T35-11 Axial Flow Fan | BT35-11 Configuration |
|---|---|---|
| Primary use | General industrial ventilation | Ventilation requiring explosion-proof electrical configuration |
| Motor | Standard industrial motor | Explosion-proof motor selected by project requirement |
| Working area | Non-hazardous industrial area | Hazardous-area ventilation only after formal requirement confirmation |
| Additional data required | Airflow, pressure, voltage and installation | Explosion-proof grade, gas group, temperature class, certificate and wiring method |
For BT35-11, the project review must cover the complete fan construction, electrical equipment and applicable documentation against the specified hazardous area. An explosion-protected motor alone does not establish suitability of the complete assembly.
Operating boundary
Suitable Conditions and Cases Requiring Another Fan Type
Suitable conditions
- Large airflow with low system resistance
- Workshop and warehouse air exchange
- Wall-mounted exhaust ventilation
- Equipment-room cooling and exhaust
- Short-duct ventilation
Not the first choice
- Long ducts with high resistance
- Bag filters and dust collectors
- Boiler draft and hot flue gas
- Heavy or abrasive dust
- Strongly corrosive gas without special design
For long ducts, filters, baghouses or systems requiring high static pressure, compare a centrifugal fan against the calculated operating point.
Technical summary
Reference Technical Parameters
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| Product series | T35-11 / BT35-11 |
|---|---|
| Fan type | Direct-drive axial flow fan |
| Fan size | No. 2.8–11.2 |
| Impeller diameter | Approx. 280–1120 mm |
| Reference airflow | Approx. 1,500–67,900 m³/h |
| Reference total pressure | Approx. 39–474 Pa |
| Reference speed | 960 / 1450 / 2900 r/min |
| Motor power | 0.18–7.5 kW common range; other configurations by confirmation |
| Reference blade angle | 15° / 20° / 25° / 30° / 35° |
| Reference blade quantity | 4 blades |
| Voltage | 220 V / 380 V; other voltage and frequency by confirmation |
| Installation | Wall-mounted, duct-mounted, floor support or customized support frame |
| Medium | Clean air or specified non-corrosive gas |
These are preliminary reference ranges, not a continuous performance curve. Final airflow, pressure, power and dimensions depend on fan size, blade angle, speed, motor configuration and operating condition.
Model reference
Typical T35 / BT35 Model Data
The following data is preserved for preliminary comparison. Check the selected operating point and the manufacturer’s model data before final selection.
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| Model | Speed | Airflow reference | Pressure reference | Motor power reference |
|---|---|---|---|---|
| No. 2.8 | 1450 / 2900 r/min | 1,500–3,200 m³/h | 60–232 Pa | 0.18–0.25 kW |
| No. 3.15 | 1450 / 2900 r/min | 2,270–4,545 m³/h | 74–373 Pa | 0.25–0.37 kW |
| No. 3.55 | 1450 / 2900 r/min | 3,265–6,542 m³/h | 93–373 Pa | 0.37–0.75 kW |
| No. 4 | 1450 / 2900 r/min | 4,687–9,336 m³/h | 119–474 Pa | 0.55–1.1 kW |
| No. 4.5 | 1450 r/min | 6,658 m³/h | 150 Pa | 0.55 kW |
| No. 5 | 1450 r/min | 9,133 m³/h | 185 Pa | 0.75 kW |
| No. 5.6 | 1450 r/min | 12,812 m³/h | 232 Pa | 1.1 kW |
| No. 6.3 | 1450 r/min | 18,250 m³/h | 294 Pa | 1.5 kW |
| No. 7.1 | 960 / 1450 r/min | 17,296–26,120 m³/h | 164–373 Pa | 1.5–3 kW |
| No. 8 | 960 / 1450 r/min | 24,739–37,370 m³/h | 208–474 Pa | 2.2–4 kW |
| No. 9 | 960 r/min | 35,227 m³/h | 263 Pa | 3 kW |
| No. 10 | 960 r/min | 48,326 m³/h | 321 Pa | 4 kW |
| No. 11.2 | 960 r/min | 67,892 m³/h | 407 Pa | 7.5 kW |
Structure and installation
Direct-Drive Axial Fan Construction
The fan mainly consists of a cylindrical casing, axial impeller, hub, direct-drive motor, protective guard, flange and support structure.
Cylindrical casing
Guides airflow and provides the duct or wall connection.
Axial impeller
Produces straight-through airflow along the fan axis.
Direct-drive motor
Reduces transmission components and keeps the structure compact.
Guard and flange
Configured according to installation and safety requirements.
Wall, Duct and Support-Frame Installation
T35-11 and BT35-11 can be supplied for wall-mounted installation, short-duct connection, floor support or project-specific mounting structures.
For wall exhaust installations, coordinate the louver, guard, shutter and replacement-air path before confirming the fan duty and mounting arrangement.
- Wall-opening ventilation for workshops and warehouses
- Short-duct air supply or exhaust
- Equipment-room heat exhaust
- Platform or foundation support
- Customized flange, guard, support frame or rain cover
BT35 safety configuration
Explosion-Proof Requirements Must Be Confirmed Before Production
Specify the hazardous-area requirement for the complete BT35-11 assembly, including mechanical construction and electrical equipment. Have the responsible engineer review the proposed configuration and scope of its supporting certificates before ordering.
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| Explosion-proof grade | Confirm before quotation |
|---|---|
| Gas group | Confirm from site classification |
| Temperature class | Confirm from project requirement |
| Certificate | Specify required standard or certification |
| Wiring method | Confirm junction box and cable-entry requirement |
Purchase package
Confirm the Opening, Air Direction and Accessory Scope
Wall-Opening Replacement
Send the opening width, height and wall thickness, mounting-frame details, and photographs from both sides. Mark the required airflow direction on a sketch. Identify whether the existing louvre or shutter stays in place.
Short-Duct Replacement
Send the mating flange dimensions, bolt pattern, available casing length, support position and nearby bends. Pair the installation sketch with the required airflow and installed resistance; nominal fan diameter alone does not establish fit or duty.
Fan Only or Complete Package?
List the fan, motor, guard, flange, support frame, shutter, weather protection and controls separately as supplied, retained or installer-provided. Include retained accessories in the resistance review.
One Selection, One Drawing
Request fan size, blade angle, speed, motor and operating point on the same selection record. Ask for a matching outline drawing with airflow direction, electrical connection location and service access.
For greenhouse replacement projects, review the greenhouse air path and existing accessories alongside the fan request.
Selection information
What to Provide for Correct Axial Fan Selection
Required airflow
Provide the required air volume in m³/h and any expected operating range.
System resistance
Provide pressure or duct-resistance data to confirm whether an axial fan is suitable.
Installation method
Wall opening, duct connection, floor support, flange size and available space.
Medium condition
Confirm air composition, temperature, dust, moisture and corrosion conditions.
Electrical supply
Provide voltage, frequency, phase, protection level and preferred motor standard.
Explosion-proof requirement
For BT35, provide grade, gas group, temperature class and certificate requirement.
Typical Ventilation Applications
- General factory ventilation for workshops and industrial buildings
- Large-airflow exchange in warehouses and enclosed spaces
- Heat removal and cooling ventilation for equipment rooms
- Air movement through short ducts with relatively low resistance
- Direct air discharge through wall openings and louvers
- BT35 project ventilation after the hazardous-area requirements are confirmed
Frequently asked questions
T35-11 / BT35-11 FAQ
What is the main difference between T35-11 and BT35-11?
T35-11 is used for general ventilation. BT35-11 enquiries require a project-specific review of the complete fan’s mechanical construction, electrical equipment and applicable certification, not only the motor.
Is an axial fan suitable for a long-duct system?
Usually not as the first choice. T35 and BT35 are mainly selected for large airflow and low resistance. Long ducts, filters and silencers may require a centrifugal fan.
Can BT35 be used in every hazardous area?
No. Explosion-proof grade, gas group, temperature class, certificate and installation method must match the specific hazardous-area requirement.
Can installation and voltage be customized?
Wall, duct and support-frame installation can be configured. Voltage and frequency can be matched to the project power supply.
What information should be sent for quotation?
Please provide airflow, pressure or duct resistance, installation method, medium, temperature, voltage, frequency, explosion-proof requirement, quantity and destination.
Send your T35 or BT35 ventilation requirements
Request a Project-Based Fan Selection
Send airflow, system resistance, installation method, medium condition, voltage and any explosion-proof requirement. The selected fan size, motor and configuration should be confirmed against the project operating point.