High Temperature Axial Fan
GKF GKT Drying Fan
Rated for 130 C ambient and 98 percent humidity, in eleven diameters and four mounting types, for paint lines, tobacco, rubber, pharmaceutical and timber drying.
GKW GWF Full Aluminium Wood Drying Kiln Fan
A wall type kiln fan in all aluminium, eight diameters from 400 mm to 1000 mm, built for reversible duty at 130 C and 98 percent humidity.
High Temperature Axial Fan
Product Overview
The GKW and GWF series is a full aluminium wall type axial ventilator designed specifically for the drying kiln. High temperature and high humidity are the defining conditions, and the fan is built around them: resistant to high temperature, resistant to high humidity, large air volume, high efficiency, energy saving and convenient installation.
It is used in the ventilation system of wood drying kilns and other drying equipment. The applied conditions are a maximum ambient temperature of 130 C and a maximum relative humidity of 98 percent, in an acid-deficient or mildly alkaline steam environment without combustible gas, and the motor can also be used in vacuum drying equipment depending on the specific conditions.
Eight standard diameters are offered, from 400 mm to 1000 mm, and the fan runs continuously in both directions, which is how a timber kiln equalises drying across the stack.
Key Benefits
What This Product Changes
1
Reversible duty as standard
Continuous S1 operation with periodic running in positive and opposite directions. Reversing the airflow on a cycle is what stops one face of the timber stack drying faster than the other.
2
All aluminium in a steam environment
Aluminium alloy frame, aluminium alloy impeller and an aluminium alloy motor shell, with stainless steel and copper fasteners. Steel that is merely painted does not survive a kiln.
3
Installation that does not fight the kiln wall
The wall type format and the fan blades connecting directly to the motor keep the installation short and the maintenance access simple.
4
Speed matched to the kiln, not to a catalogue
2900 r/min, 1450 r/min and 960 r/min, with the blade angle adjusted to the client requirement and arc or right-angle blades available.
Problems It Solves
The Situations That Lead People Here
1
Motors fail in the middle of a drying cycle
H class 180 C insulation with all-copper windings and modified polyester imide enamelled wire is the specific answer. A failure mid-cycle costs the whole charge, not just the fan.
2
Timber dries unevenly across the stack
Reversible running and large air volume even out the moisture gradient through the pile instead of drying the windward face first.
3
Bearings seize in high humidity
The motor uses an external structure injected with lubricating oil and high-temperature grease imported from Japan, which extends bearing life and avoids dismantling for lubrication.
4
Vibration cracks kiln wall fixings
Straight shaft extension and subulate shaft extension with high-temperature bearing grease keep noise and vibration low at the wall penetration.
Technical Features
How It Is Built
1
Full aluminium wall type construction
Aluminium alloy fan frame and impeller with an aluminium alloy motor shell, giving a structure that survives continuous steam exposure.
2
H class 180 C high-temperature motor
100 percent copper motor with H class insulation using modified polyester imide enamelled wire, designed by advanced thermodynamic analysis to lower electromagnetic loading while raising efficiency.
3
Direct blade to motor connection
The fan blades can connect directly to the motor, removing a coupling from the assembly and from the maintenance list.
4
Three rotational speeds
2900 r/min, 1450 r/min and 960 r/min, chosen so the circumferential velocity of the impeller stays within condition.
5
Four to eight aluminium alloy blades
Rust-resistant blades in arc or right-angle profile so the duty can be matched without changing the housing.
6
Externally lubricated bearings
External lubricating oil structure with Japanese high-temperature grease, inspected strictly before shipment.
Specifications
Data Sheet
Every figure below comes from our own specification. Where a value depends on the diameter or the duty it is written as TBC rather than invented, and it is confirmed on the specification sheet issued with your quotation.
| Diameter | 400 mm, 500 mm, 550 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm |
|---|---|
| Maximum ambient temperature | 130 C |
| Maximum relative humidity | 98 percent |
| Power form | Single phase 220 V; three phase 220 / 380 / 660 V, 230 / 400 / 690 V, 240 / 415 V |
| Frequency | 50 / 60 Hz |
| Working method | Continuous (S1), periodic running in positive and opposite directions |
| Cooling mode | IC0141, IC411 (totally enclosed fan-cooled) |
| Protection class | IP55 |
| Insulation class | Class H (180 C) |
| Rotational speeds | 2900 r/min, 1450 r/min, 960 r/min |
| Impeller | 4 to 8 aluminium alloy blades, arc or right-angle profile |
| Fan frame | Aluminium alloy |
| Mounting | Wall type for kiln wall installation |
| HS code | 8414599099 |
| Air volume per diameter | TBC, confirm at quotation |
Materials
- Aluminium alloy fan frame, impeller and motor shell
- Stainless steel and copper fastening pieces
- All-copper windings with modified polyester imide enamelled wire
- High-temperature bearing grease imported from Japan
Quality Control
- Stator withstand-voltage testing on every motor before assembly
- Impeller dynamic balancing, critical on a fan that reverses on a cycle
- Strict inspection before shipment
- Insulation verified against the Class H 180 C rating
Customisation Options
- Diameter selected from eight sizes to match the kiln wall opening
- Blade angle adjusted to the client requirement
- Arc or right-angle blade profile to meet different duties
- Customised high-temperature resistance for duties above the standard condition
- Windings matched to the site supply voltage and frequency
Comparison
How It Compares
Choosing between the GKW GWF and the other high-temperature options.
| Against the GKF GKT drying fan | The GKF GKT covers eleven diameters and four mounting types across paint, tobacco, rubber and pharmaceutical drying. The GKW GWF is the full aluminium wall type built specifically around the timber kiln. |
|---|---|
| Against the CRF diagonal grain drying fan | The CRF is for grain dryers, where the pre-rotation vane and meridian acceleration design give the pressure and volume that a grain column needs. For timber, the wall type kiln fan is the right format. |
| Against a general-purpose axial fan | General-purpose fans are not rated for 130 C at 98 percent humidity and do not use an all-aluminium structure. In a kiln they are a consumable. |
| Against upgrading only the motor | Refitting an H class motor into a steel housing leaves the housing, fasteners and impeller to corrode. The all-aluminium construction is part of the answer, not an extra. |
Use Guide
Getting It Right on Site
1
Set the reversing cycle to the schedule
The fan is rated for periodic running in both directions. Tie the reversal to the kiln schedule rather than leaving it in one direction for the whole charge.
2
Confirm the wall opening before ordering
Wall type fans need the opening and the fixing pattern to match. Send the existing opening dimensions and the fan is selected to fit rather than the wall being cut again.
3
Watch the condition limits, not just the temperature
130 C and 98 percent humidity are the boundary, and combustible gas is outside the rating entirely. A kiln that may accumulate flammable vapour needs the CBF explosion-proof range.
4
Inspect after each maintenance shutdown
Check the fixing bolts, end cover screws and the junction box terminals for looseness or burn marks while the kiln is cold and accessible.
Related Products
Others in the Same Conversation
High Temperature Axial Fan
High Temperature Axial Fan
CRF Diagonal Grain Drying Fan
A patented diagonal flow design that cuts 40 to 50 minutes off a 15 T drying run and drops the noise from over 110 dB to within 85 dB.
High Temperature Axial Fan
CBF Explosion-Proof Fan
ExdIIBT4 marked to GB3836.2 and IEC 60079 for Zone 1 and Zone 2 areas, in four mounting types and six diameters.
Further Reading
Guides That Touch This Product
Technical Note
Why H Class Motors Survive a Drying Kiln
A drying fan does not fail at the blade. It fails at the motor, and the specification items that decide the outcome are...
Product Guide
Three Numbers That Decide an Industrial Fan
Three figures describe an industrial fan honestly: wind speed, air volume and rotating speed. Each one trades against the others,...
Questions
Questions About the GKW GWF Wood Drying Fan
Because air dries the face it hits first. Running the fan in positive and opposite directions on a periodic cycle evens out the moisture gradient through the stack, which is why the S1 duty with periodic reversal is written into the specification.
The applied conditions. Maximum ambient 130 C, maximum relative humidity 98 percent, an all-aluminium frame, impeller and motor shell, stainless and copper fasteners, and an H class 180 C all-copper motor. A standard fan meets none of that.
It follows the air volume required through the timber stack and the wall opening available, in eight sizes between 400 mm and 1000 mm. Send the kiln internal dimensions, the stack size and the number of fan positions and we will select.
The motor can also be used in vacuum drying equipment according to the specific conditions. Tell us the process and we will confirm before the order is placed.
The motor uses an external structure injected with lubricating oil, with high-temperature grease imported from Japan. The point of that design is that the bearing does not have to be dismantled for oiling.
HS 8414599099, the same code as the rest of the axial fan range, which makes a mixed shipment of kiln fans straightforward to declare.
Price the GKW GWF Wood Drying Fan for Your Site
Tell us the duty, the quantity and the destination port. The first reply contains a model, a price and a freight figure.