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Why are mine negative pressure air ducts often made in 10-meter sections? It's all about experience—too long makes them hard to move, too short makes splicing laborious. Ten meters perfectly balances the rhythm of underground handling and installation. Do you know how many steel rings are in a mine skeleton air duct? It's not arbitrary—short-distance ones may have a few per section, while long-distance, high-negative-pressure ones require denser rings, like giving the duct a "sturdy backbone."

Uses of Negative Pressure Air Ducts:

Primarily used for exhaust ventilation, they consist of steel rings combined with coated fabric, commonly known as skeleton air ducts. They are often used in conjunction with positive pressure air ducts: positive pressure ducts deliver fresh air to the workface, while negative pressure ducts extract pollutants, forming a complete ventilation system.

Mine skeleton negative pressure air ducts, with their built-in rigid frames (such as steel rings or plastic hoops) spaced at intervals, effectively resist external pressure in negative pressure environments, preventing collapse.

Standard Parameters for Mine Positive/Negative Pressure Flame-Retardant Air Ducts (Positive Pressure Ducts):

Internal Pressure Resistance: ≥ 5000 Pa

Expansion Rate: ≤ 3%

Air Leakage Rate per 100 Meters: ≤ 4%

Other Properties: Flame retardant, anti-static, heat-resistant, cold-resistant, etc., all compliant with coal industry standards.

Specifications for Mine Positive/Negative Pressure Flame-Retardant Air Ducts: Ф 300mm, Ф 400mm, Ф 450mm, Ф 500mm, Ф 600mm, Ф 800mm, Ф 1000mm

Classification of Coated Fabric Air Ducts:

Coal mine coated fabric air ducts can be divided into positive pressure and negative pressure types based on ventilation methods. Positive pressure ducts are typically used for forced air ventilation with underground fans. Common examples include plastic-coated positive pressure air ducts for coal mines, usually in 10-meter sections without internal skeletons. This design ensures smoother airflow, allowing air to be delivered quickly to the workface. Too few skeletons in mine positive/negative pressure air ducts may compromise stability, while too many add unnecessary weight. Ultimately, proper arrangement is key for effective use. Flame-retardant air ducts mainly come in black, orange-yellow, and dark green.