5-47 High Air Flow Low Noise Carbon Steel Industrial Boiler ID Fan

This article's table of contents introduction:

1. What is a "5-47" Fan?
2. Key Features of the Specified Fan
3. Typical Applications (Boiler Systems)
4. Critical Selection Factors
5. Leading Manufacturers for "5-47" & Competitors
6. Important Note on "5-47" vs. "Y5-47" (China Standard)
7. Example Purchase Specification (What to ask your supplier)
8. Summary

This is a very specific product query. Based on the description "5-47 High Air Flow Low Noise Carbon Steel Industrial Boiler ID Fan," you are looking for a specific series of centrifugal fan often used in industrial boiler systems (Induced Draft).

Here is a breakdown of what that specification means, common manufacturers, typical applications, and key considerations for purchasing.

What is a "5-47" Fan?

The "5-47" refers to a specific wheel type and performance curve design, originally popularized by the Chicago Blower and New York Blower (NYB) designs, now replicated by many manufacturers.

• Type: Backward Inclined (BI) or Airfoil (AF) centrifugal fan.
• Key Feature: High efficiency, non-overloading horsepower characteristics, and relatively low noise for the volume of air moved.
• 5-47 Design: This specific wheel design is optimized for medium to high pressure applications (typical for boiler ID fans) where efficiency and stability are critical.

Key Features of the Specified Fan

• High Air Flow: Designed to move large volumes of flue gas.
• Low Noise: Backward-inclined blades (typical of 5-47) operate more quietly than forward-curved (SIROCCO) fans.
• Carbon Steel Construction: Standard material for handling high-temperature flue gas (up to ~650°F / 343°C without special coatings). For higher temps, alloys or stainless steel are needed.
• ID Fan (Induced Draft): This fan pulls hot, dirty, corrosive flue gas through the boiler, heat exchangers, and scrubbers, and pushes it out the stack. It operates under negative pressure on the inlet side.

Typical Applications (Boiler Systems)

• Industrial steam boilers (e.g., 100 HP to 100,000+ PPH)
• Power plant coal or biomass boilers
• Heat recovery steam generators (HRSG)
• Incinerators and waste-to-energy plants

Critical Selection Factors

When sourcing this fan for an industrial boiler, you must provide the following data to ensure the "5-47" wheel is correctly sized:

1. Actual Volume (ACFM): Flue gas volume at operating temperature (hot flow, not standard flow).
2. Static Pressure (SP): Total pressure drop the fan must overcome (ductwork, boiler tubes, baghouse, scrubber).
3. Gas Temperature: ID fans handle hot gas (usually 300°F - 500°F). High temperatures require a shaft cooler, high-temperature grease, or water-cooled bearings.
4. Gas Composition: Is the gas dirty (leading to erosion)? Corrosive (SOx, NOx requiring coatings like phenolic or stainless steel)? Clean gas? The 5-47 wheel is sensitive to dust buildup; for heavy dust, a radial tip or paddle wheel is better.
5. Noise Limits: Industrial fans are loud. "Low Noise" typically implies:
   • Sound power level < 85 dBA (or lower) at 1 meter.
   • Inlet and outlet silencers required.
   • Fan speed below 3,600 RPM.

Leading Manufacturers for "5-47" & Competitors

• New York Blower (NYB): The "grandfather" of the 5-47 design. They offer "GI Fan" and "DH Fan" series.
• Chicago Blower: "Standard Duty" and "Heavy Duty" FANS.
• Twin City Fan & Blower: High quality "Q" series and "GI" fans.
• Greenheck: Industrial centrifugal fans.
• Howden / Robinson: Heavy-duty ID fans for power generation.
• China/Turkey OEMs: Many factories produce "5-47" copies (often labeled as "9-19" or "Y5-47" in Chinese standards). These are much cheaper but often have lower material quality.

Important Note on "5-47" vs. "Y5-47" (China Standard)

If you see "Y5-47" (with a Y), this is a common Chinese industrial fan designation.

• Y5-47: Induced draft fan for boilers, 5 = high efficiency series, 47 = specific impeller diameter ratio.
• C5-47: (C for dust) Used for exhaust with lighter dust loads.
• G5-47: (G for air) Used for forced draft.

Example Purchase Specification (What to ask your supplier)

Item: Industrial Boiler Induced Draft Fan, Class II, Size 300 (example). Type: Arrangement 1 (Overhung, direct drive). Wheel: Backward Inclined, 5-47 design, carbon steel (ASTM A36). Housing: Carbon steel, bolted split (cleanout door > 12"). Performance: 25,000 ACFM at 15" w.g. static pressure at 350°F. Sound: Max 85 dB(A) at 1m. Inlet Box: Vortex damper for control. Accessories: Inlet screen, vibration switches, flexible connectors. Drive: Motor sheave, belts, guard (or direct coupled with variable frequency drive).

Summary

Best for: Industrial boilers requiring high efficiency, moderate noise, and non-overloading power. Not best for: Extremely dirty/abrasive gas (use radial tip fan) or very low-space applications.

Price Estimate (2024-2025):

• Medium duty (Size 200-300): $8,000 - $25,000 USD.
• Heavy duty (Size 400+, with VFD & silencer): $35,000 - $100,000+ USD.

If you have the specific Size (wheel diameter) or Performance (CFM/SP/Temp) , I can help refine the selection.