4-72 B Series Centrifugal Fan

* Model 16B /18B /20B of 4-72 B-type centrifugal fan adopts backward curved high-efficiency airfoil impeller, heavy-duty split cast iron bearing pedestal and belt pulley transmission layout, whole set consists of volute casing, large-size impeller, bearing assembly and separately arranged driving motor. ·

* All impeller components go through precise static & dynamic balance test to guarantee low vibration and stable continuous long-time running under large air volume industrial ventilation condition. ·

* B-type belt driven design allows flexible speed adjustment via changing pulley size to match on-site required airflow and total pressure; robust thick steel casing improves wear resistance for dusty factory working environment.

* Multiple optional outlet angles can be customized to match on-site industrial pipeline layout without extra pipe transformation. ·

* Wide power & speed range configuration satisfies large-space factory ventilation, waste gas exhausting and mine air exchange engineering requirements.

4-72 B Model Features:

Material Properties

Featured by big air volume, high efficiency, stable pressure performance and durable structure, 4-72B series fans are widely used for general factory workshop ventilation, industrial waste gas exhaust, mine ventilation, large warehouse and construction air exchange. Standard version is equipped with ordinary three-phase asynchronous motor; B-4-72 explosion-proof variant fitted with YB flameproof motor is customized for chemical plant flammable volatile waste gas exhausting. F-4-72 full stainless steel customized fan is available for corrosive acid & alkali waste gas conveying, keeping identical overall dimension and airflow parameters as standard carbon steel fan.

Benefits

Standard 4-72B fan is suitable for transporting clean non-corrosive, non-self-ignition harmless air; explosion-proof model is used for exhausting combustible volatile industrial waste gas. Conveyed medium excludes sticky viscous substance, solid dust particle ≤150mg/m³ and medium working temperature shall not exceed 80℃.

Fan Structure

Explosion-proof B-4-72 centrifugal fan retains consistent technical performance, outline dimension and foundation installation size with standard 4-72B fan, only driving motor is replaced with flameproof specification.

Model Selection

Rotating speed ranges from 250r/min ~900r/min with matched power from 11kW up to 200kW, diversified speed-power collocation forms wide flow and full pressure scope to satisfy different industrial pipeline resistance demand; detailed matching parameters are recorded in official 4-72 product manual.

Q1: What’s the advantage of B-type belt drive compared with A-type direct drive?

A1: B-type belt structure can change fan rotating speed by replacing pulley size to adjust airflow and pressure flexibly to match variable production working load.

Q2: Can explosion-proof 4-72B be used for chemical factory flammable waste gas exhaust?

A2: Yes, explosion-proof model with IE4 flameproof motor is customized for industrial site with volatile combustible gas.

Q3: Can stainless steel version resist acid/alkali corrosive waste gas?

A3: Full SS304 stainless steel fan is available for corrosive waste gas treatment, same installation size and performance as carbon steel standard fan.

Q4: What is the limit of dust content and working temperature for standard fan?

A4: Conveyed gas dust ≤150mg/m³ without sticky substance, medium temperature ≤80℃ for long-term stable running.

Q5: Can fan outlet angle be customized to fit existing industrial duct?

A5: Multiple outlet angles (0°/90°/180° etc.) can be preset during production to match on-site pipeline layout.

Q6: How to select proper model for my factory ventilation project?

A6: Provide required airflow, total pipeline resistance and gas property, we match corresponding model, power and rotating speed.

Q7: Do you offer CE certified motor for European industrial project?

A7: Standard motor meets IEC standard, CE certification motor can be equipped as customized order for EU clients.

Q8: Is heavy-duty bearing base design for continuous 24h running?

A8: Cast iron thickened bearing pedestal supports long-time non-stop operation for factory continuous production ventilation.

Q9: What is your factory warranty period?

A9: 12-month warranty against manufacturing defects from shipment date; wearing parts like bearing and belt are excluded from free warranty.

Q10: Can variable frequency motor be equipped for energy-saving speed regulation?

A10: VFD motor is optional on request to realize stepless speed change and reduce power consumption under part-load working condition.