This article's table of contents introduction:
Here is a professional draft for a Product Specification Sheet and a Technical Description for an Exhaust Boiler Fan with Air Filter (Centrifugal Blower) . This draft is suitable for a manufacturer, engineer, or procurement documentation.
Product Specification Sheet
Product Name: High-Temperature Centrifugal Exhaust Blower with Pre-Filter Assembly Model No: CEB-450-AF Application: Industrial boilers, furnace exhaust, biomass gas evacuation.
General Specifications
| Parameter | Specification |
|---|---|
| Type | Centrifugal, Single Inlet, Forward/Backward Curved |
| Service | Exhaust / Induced Draft |
| Mounting | Floor mount with vibration isolators |
| Max Ambient Temp | -20°C to +60°C |
| Gas Temp (Inlet) | Max 250°C (with cooling wheel option up to 450°C) |
Mechanical Construction
| Component | Material / Description |
|---|---|
| Housing | Heavy-duty MS / SS304 / SS316; split housing for easy maintenance. |
| Impeller | Radial or backward curved blades; dynamically balanced. |
| Shaft | EN8 / SS410 with keyway; sealed bearing housing. |
| Air Filter Box | Mild Steel with hinged door; mounted on inlet duct. |
| Filter Type | Pleated panel filter (G4/M5) or bag filter (F6/F7) option. |
| Seals | High-temp labyrinth seal + purge air seal (for hot gas). |
Performance Data (Example at 50 Hz)
| Parameter | Value |
|---|---|
| Air Flow (m³/hr) | 5,000 – 50,000+ (customizable) |
| Static Pressure (mmWC) | 100 – 600 mmWC |
| Speed (RPM) | 1450 / 2900 (direct or belt driven) |
Motor & Electrical
| Parameter | Specification |
|---|---|
| Power | 5 HP – 50 HP (3.7 kW – 37 kW) |
| Motor Type | TEFC, IE3/IE4, Foot Mounted |
| IP Rating | IP55 |
| Voltage | 415V / 3 Phase / 50 Hz (or 460V/60Hz) |
Optional Features
- [ ] Variable Frequency Drive (VFD) Controller
- [ ] Silencer / Sound Attenuator
- [ ] Temperature Sensor (RTD) with Auto Shutdown
- [ ] Drain valve for condensate (cold start)
- [ ] Explosion-proof motor (ATEX certified)
Technical Description (Narrative Draft)
Functional Overview
The Exhaust Boiler Fan with Air Filter is a robust centrifugal blower designed to handle hot, dirty, or corrosive flue gases from industrial boilers. The unit serves as an Induced Draft (ID) Fan, ensuring negative pressure in the combustion chamber for safe and efficient fuel burning.
Key Components & Design Logic
Air Filter Assembly (Inlet Side)
Purpose: Prevents ash, soot, and particulate matter from entering the fan housing.
- Design: A bolted modular housing containing high-density pleated filter cartridges.
- Dust Loading: Equipped with a differential pressure gauge (magnehelic) to indicate when cleaning is required.
- Access: Quick-release latches allow tool-free filter change.
Centrifugal Impeller
Why Centrifugal? Centrifugal blowers generate high static pressure necessary to overcome duct resistance and boiler friction losses.
- Blade Type: Backward Curved (preferred for non-stalling performance and lower noise) or Radial Tip (for heavy dust loading).
- Balance: ISO 1940 G6.3 dynamic balance standard, ensuring vibration below 4.5 mm/s.
Drive Mechanism
- Direct Drive: For high-speed, clean gas applications.
- Belt Drive: Recommended for boilers. Allows speed adjustment (by changing pulleys) to match variable exhaust conditions without a VFD. The belt also acts as a mechanical fuse (protects motor if impeller jams).
Casing & Bearings
- The casing is designed with a drain plug at the lowest point to release condensation formed during warm-up.
- Bearings are located outside the gas stream in a cooling tower or plummer block housing to extend life at high temperatures.
Operational Sequence
- Startup: Fan starts with inlet damper closed (no load).
- Purge: Air filter allows clean makeup air to mix with exhaust if damper is opened.
- Running: Draws hot gases from boiler, passes through filter, then expelled to chimney.
- Shutdown: Timer-based purge cycle runs fan for 2 minutes post-combustion to clear residual heat.
Safety Considerations
- Thermal Expansion: A flexible connector (expansion joint) must be installed between the boiler outlet and fan inlet to prevent stress cracking.
- Explosion Relief: For coal/biomass boilers, an explosion relief panel or rupture disc must be added near the filter box.
Ordering Checklist
To ensure correct sizing, please provide:
- Gas Volume (Nm³/hr or ACFM) at operating temperature.
- Gas Temperature (Min / Normal / Max).
- Static Pressure required at the fan inlet.
- Gas Composition (e.g., high sulfur, moisture, dust type).
- Altitude (affects pressure calculation).
Draft Prepared By: [Your Name / Engineering Dept] Version: 1.0 Date: [Insert Date]
Would you like a CAD-ready dimension drawing, a Bill of Materials (BOM) , or a CFD analysis summary for this fan?
