Dr.Air KHF-1700 Plus Double Filter Portable Welding Fume Extractor

Dr.Air KHF-3000 Plus Double Filter – Key Features

Superior to all other versions with two extraction hoods and two filters, the Dr.Air KHF-3000 Plus Double Filter welding fume extractor is considered an ideal choice for the most discerning investors.

• Welding fume treatment efficiency is not just doubled but up to four times higher compared to standard models.

• Modern technology with durable and stable operation.

• Flexible design with four caster wheels for easy movement and on-site fume extraction.

• Smart control panel with simple on/off operation, including two indicator lights (power light and operation light) for easy recognition.

• Equipped with a scientifically designed dust-shaking mechanism, operating based on a high-pressure reverse-airflow cleaning method.

Proper Operation of a Welding Fume Extraction System

Welding fume extraction systems are an important part of OSHA’s Hierarchy of Controls for managing fumes—specifically Engineering Controls. Several key adjustments must be considered to achieve optimal results.

Types of portable fume extraction systems

Portable welding fume extraction stations capture and remove contaminants before delivering clean air back to the worker’s breathing zone. These systems are available in various shapes and sizes and are rated based on the cubic meters of air they extract per minute (cfm).

• The diameter of the duct is proportional to the cfm rating.

• Low-vacuum/high-volume systems use larger ducts and move large volumes of air at low vacuum pressure.

• High-vacuum/low-volume systems capture fumes closer to the weld, using smaller nozzles and ducts. Smaller ducts are more suitable for tight spaces and for capturing fumes near the welding point.

Proper positioning of the extraction arm

Correct placement of the extraction hood is essential for system efficiency. The hood must be positioned so that fumes are removed from the worker’s breathing zone.
When using mobile extraction arms, place the hood above the arc.
The recommended distance varies according to airflow speed and volume but is typically around 1.5 times the diameter of the extraction arm.

Importance of system maintenance

Maintenance of fume extraction systems is crucial to save time, reduce costs, and ensure the system operates at full capacity.

• Systems using disposable filters require monitoring via a filter indicator gauge. A clogged filter reduces airflow.

• For self-cleaning filter systems, ensure that compressed air lines are properly connected, functioning normally, and that the air is clean and dry.

Ten Reasons to Choose Dr.Air Mobile Welding Fume Extractors

1. High-quality products trusted by hundreds of welding workshops with consistently positive feedback.

2. Reputable brand with clear warranty and maintenance policies.

3. Factory-direct pricing—manufactured and distributed in Vietnam without third-party intermediaries; fast repair services.

4. Full certification and product quality documentation.

5. Equipped with advanced Nano filtration technology to ensure a safer working environment.

6. Mobile and flexible design with four caster wheels for easy movement and on-site fume removal.

7. Easily adjustable extraction hood for operator convenience.

8. Built-in dust-shaking system for simple cleaning and longer filter lifespan.

9. Nationwide delivery with full warranty documents and user manuals.

10. 24/7 customer support and experienced technicians providing maximum assistance during operation, repair, and maintenance.