Air-Blade Hand Dryer Blowers: How Jets Remove Water
A two-slot air-blade dryer uses thin sheets of moving air to sweep liquid water from the hands. Its blower must sustain the pressure and airflow needed at the final nozzle, after the losses in the inlet filter and internal passages. Understanding that complete route helps an OEM select a blower that works in the finished dryer.
Follow the airflow through the equipment
1. Bring air through the inlet
Room air passes through the inlet filter before reaching the motor-driven impeller. The filter, inlet openings and bends all add resistance. A blower rating measured with an unrestricted inlet does not describe the airflow at the hands.
2. Feed the slot plenums
The blower supplies air to passages that distribute it along the narrow outlets. Plenum geometry and seals help determine how evenly the slots are supplied. The outlet must receive useful flow along its length.
3. Detach liquid from the skin
The thin jet pushes water across the wet hand surface until droplets detach. Much of the removal is mechanical: the dryer does not have to wait for every drop to evaporate. The geometry determines where the air meets the hand.
4. Manage the discharged water
Liquid leaving the hands needs a suitable collection or drainage arrangement in the complete product. Keep the useful jet clear of obstructions and evaluate the working hand position alongside the outlet geometry.
What the fan contributes
- Produce pressure across the filter, passages and nozzle.
- Maintain airflow that reaches the intended hand area.
- Respond to the dryer’s start–stop cycle and control system.
What interrupts the intended process
- A loaded filter reduces the useful flow available to the slots.
- Poor plenum distribution or blocked slot sections leaves an uneven jet.
- A blower selected from a peak airflow or pressure number alone can miss the installed operating point.
Prepare the operating conditions
Share your layout and the operating information below. If a value is still unknown, identify it so the next measurement can be agreed before a model is selected.
Match the fan to this air path
LONGWELL’s brushless blower catalog lists through-flow families for hand-dryer applications. Use that application association to start the selection, then compare candidate curves with the resistance of the complete filter-and-nozzle assembly. Share the available installation space and operating cycle so the motor, control and mounting can be assessed together.
Where it sits
Between the inlet filter and the slot plenums, in the dry air-supply module.
Why consider this configuration
A through-flow blower is a candidate for the pressure required across filters, passages and narrow slots; the catalog explicitly lists hand dryers.
Check performance in the assembled equipment
Discuss this application with LONGWELL
Send LONGWELL your nozzle layout, required operating point and available space.
Start with your layout and the requirements you already know. Confirm the selected configuration in the complete equipment.