Duct-Type Exproof Fan

What is a duct-type exproof fan?

Duct-type exproof fans are fans designed to be installed inline in round ventilation ducts and to safely transport air that may contain explosive gases or vapors. The motor and fan casing are manufactured to prevent the formation of sparks and excessively hot surfaces. They are used for duct exhaust in paint and varnish preparation rooms, solvent stores, laboratory fume hoods, battery charging rooms, and chemical processing areas.

Advantages

• Direct duct mounting: Can be connected to an existing round duct line with flanges or clamps.
• Compact design: Provides a solution in confined spaces where wall fans cannot be installed.
• Remote exhaust: Allows safe extraction of explosive air over long duct runs.

The model in this category is intended for exhaust in small to medium-sized areas, with the flow rate value stated in the product name.

Selection and installation

Fan selection must be made according to the type of flammable substance present in the environment and the zone classification in the workplace's explosion protection document. The duct diameter must match the fan's connection diameter; duct length and elbows reduce the fan's flow rate and must be factored in. The duct material must also be compatible with the vapor being conveyed and the surrounding environment. Duct and fan earthing must not be overlooked in order to prevent static electricity buildup.

Installation and maintenance

Electrical connections must be made with explosion-proof cable fittings and connection components, and must be checked by competent personnel. The inside of the duct and the fan blades must be cleaned regularly to remove accumulated paint or chemical residues. Any modification to the fan may affect its explosion protection; manufacturer instructions must be followed.

Frequently asked questions

How do I choose between a duct fan and a wall fan?

A duct-type fan is appropriate when the exhaust must be carried via ductwork to a remote point. Wall-type exproof fans can be used in areas that open directly to an exterior wall.

Why is earthing important?

Static electricity generated by airflow can create a spark risk. Earthing the fan and duct reduces this risk.

What should be done if the duct diameter is different?

A transition piece can be used if the duct diameters differ. However, these pieces must also be made from materials suitable for the explosive environment.

Should the fan run continuously?

This is determined by the vapor concentration in the environment and the operating conditions. The decision must be based on a risk assessment.

How often should maintenance be carried out?

This depends on the intensity of use and the rate of residue buildup. Regular visual inspection is recommended.

What information should I provide when requesting a quote for a duct-type exproof fan?

You can share the duct diameter, required flow rate, substances present in the environment, and zone classification.