PP/FRP Blower | Industrial Corrosion-Resistant Centrifugal Fan

PP/FRP Blower — Industrial Corrosion-Resistant Centrifugal Fans & Exhaust Systems

A PP/FRP blower — also called a PP FRP centrifugal fan, fiberglass reinforced plastic blower, or FRP exhaust blower — is a corrosion-resistant industrial fan engineered to move air, chemical fumes, and corrosive gases in environments where metal fans fail. The housing and impeller are fabricated from FRP (fiberglass reinforced plastic) using chemical-grade unsaturated polyester or vinyl ester resin with E-glass fiber reinforcement, providing full resistance to acids, alkalis, solvents, and oxidizing atmospheres. XICHENG EP manufactures PP/FRP blowers in centrifugal (direct-driven and belt-driven), high-pressure, PP/FRP hybrid, axial flow, and roof exhaust configurations, covering air volumes from 500 to 120,000 m³/h at static pressures up to 5,000 Pa.

PP/FRP blowers eliminate the two failure modes that make metal fans unsuitable for corrosive exhaust: chemical attack on the impeller causing imbalance and catastrophic bearing failure, and housing perforation allowing toxic fugitive emissions. An FRP blower with a vinyl ester resin system operating in a hydrochloric acid or chlorine environment can achieve a service life of 12-15 years compared to 6-18 months for a coated steel fan in the same service. The lightweight FRP construction — approximately 40% the weight of equivalent 316L stainless steel — reduces structural support requirements and simplifies roof or mezzanine installation. All XICHENG EP FRP blowers are factory-balanced to ISO 1940 G6.3 and tested to 1.3× design speed before shipment.

FRP Blower Product Range

FRP Centrifugal Blower (Direct-Driven)

An FRP centrifugal blower — also called an FRP centrifugal fan or fiberglass centrifugal blower — is a radial-flow fan in which the impeller mounts directly on the motor shaft, eliminating belts, pulleys, and the maintenance associated with belt drives. The direct-driven configuration provides a compact footprint, zero slip losses, and precise speed control when paired with a VFD (variable frequency drive). The impeller uses backward-curved FRP blades for high efficiency (75-82% static) and non-overloading power characteristic — motor current decreases as the system resistance increases, preventing motor burnout if a damper closes downstream.

Direct-driven FRP blowers are the standard choice for laboratory fume hood exhaust, chemical storage tank vent headers, and scrubber discharge stacks where the air stream is saturated with corrosive moisture and reliability is paramount. The absence of belts means no belt dust in cleanroom exhaust and no belt replacement in hard-to-access rooftop installations. XICHENG EP produces direct-driven FRP centrifugal blowers from 0.75 kW to 55 kW motor power in standard impeller diameters from 250 mm to 1,200 mm with a maximum operating temperature of 80°C for vinyl ester resin systems.

Parameter	Specification
Air Volume Range	500 — 65,000 m³/h
Static Pressure	Up to 3,500 Pa
Motor Power	0.75 kW — 55 kW (IE3 premium efficiency)
Impeller Diameter	250 mm — 1,200 mm
Max Temperature	80°C (vinyl ester); 60°C (polyester)

FRP Belt Driven Exhaust Fan

A belt driven FRP exhaust fan — also called a belt driven FRP centrifugal fan or belt driven fiberglass fan — uses a belt and pulley transmission between the motor and impeller shaft, allowing the impeller speed to be adjusted independently of motor speed by changing pulley ratios. This flexibility makes belt-driven configurations ideal for applications where the exact system resistance is unknown at the time of specification — the pulley can be changed during commissioning to achieve the design operating point without replacing the motor. The motor is positioned outside the air stream on an MS-FRP (mild steel frame with FRP cladding) mounting base, isolating it from corrosive exhaust contact.

Belt-driven FRP blowers provide approximately 5-10% lower peak efficiency than direct-driven due to belt friction losses, but the ability to adjust airflow post-installation and the isolation of the motor from the corrosive air stream often outweigh this penalty in practice. Standard configuration includes a two-groove V-belt drive with a taper-lock bushing for positive pulley retention, and an FRP belt guard. Impeller diameters range from 315 mm to 1,600 mm with air volumes up to 120,000 m³/h, making belt-driven units the choice for large central exhaust systems, multi-branch scrubber networks, and applications where future airflow expansion is anticipated.

Parameter	Specification
Air Volume Range	2,000 — 120,000 m³/h
Static Pressure	Up to 4,000 Pa
Motor Power	2.2 kW — 160 kW
Impeller Diameter	315 mm — 1,600 mm
Drive Type	V-belt (2-groove), taper-lock pulley

FRP High-Pressure Blower

An FRP high pressure blower — also called an FRP pressure blower or high pressure FRP fan — is a radial-tip or forward-curved impeller design engineered to develop static pressures of 2,500-5,000 Pa at moderate flow rates, overcoming the resistance of long duct runs, multiple branch take-offs, packed bed scrubbers, and activated carbon adsorbers connected in series. The impeller features narrower blade passages and a deeper blade profile than a standard centrifugal fan, trading some peak efficiency for the ability to push against high system resistance without stalling. The FRP housing is reinforced with external rib stiffeners to withstand the higher casing pressure without deflection.

High-pressure FRP blowers are specified when the combined pressure drop of the ductwork, control dampers, treatment equipment (scrubber or adsorber), and discharge stack exceeds what a standard centrifugal fan can deliver at a reasonable impeller diameter. A typical application is a central laboratory exhaust system serving 30-50 fume hoods through a manifold duct, where the fan static pressure requirement exceeds 3,000 Pa. The backward-curved or radial-tip impeller with FRP construction is inherently spark-resistant (no metal-to-metal contact possible), making these blowers suitable for solvent-laden exhaust where ATEX-rated construction is required at the motor and bearing assembly.

Parameter	Specification
Air Volume Range	1,000 — 40,000 m³/h
Static Pressure	2,500 — 5,000 Pa
Motor Power	3 kW — 90 kW
Impeller Type	Backward-curved / radial-tip FRP
Suitable For	Long duct runs, scrubber+adsorber series, manifold exhaust

PP FRP Blower

A PP FRP blower — also called an FRP PP blower or PP FRP centrifugal fan — combines a polypropylene (PP) impeller with an FRP housing, leveraging the superior chemical resistance of PP at the gas-contact surface with the structural rigidity of FRP in the casing. PP provides better resistance than standard polyester FRP to specific chemicals: concentrated hydrochloric acid, wet chlorine, sodium hypochlorite, and oxidizing acids up to 80°C. However, PP alone lacks the structural stiffness to maintain tight impeller-to-inlet-cone clearance at larger diameters, which is where the FRP housing provides the necessary rigidity to prevent rubbing and maintain aerodynamic efficiency.

The hybrid construction is specified for applications where a standard polyester FRP blower would experience chemical attack — typically in chlor-alkali plants, bleach production, chromium plating exhaust, and mixed-acid fume extraction where the chemical cocktail includes oxidizing agents. The PP impeller is injection-molded or CNC-machined from PP sheet in diameters up to 800 mm, and the FRP housing uses a vinyl ester resin barrier layer at the gas-contact surface for additional chemical resistance. Jet Fibre and other manufacturers have validated this PP-FRP configuration across thousands of installations since the 1990s.

Parameter	Specification
Air Volume Range	500 — 25,000 m³/h
Static Pressure	Up to 2,500 Pa
Impeller Material	PP (polypropylene) / PPs flame-retardant
Housing Material	FRP with vinyl ester barrier layer
Best For	Chlorine, HCl, hypochlorite, oxidizing acids

FRP Axial Fan

An FRP axial fan — also called an FRP axial exhaust fan or fiberglass axial fan — moves air parallel to the impeller shaft in a straight-through flow pattern, delivering high air volumes at low static pressures (typically 50-500 Pa). Unlike a centrifugal blower that turns the air stream 90 degrees through the impeller, an axial fan passes air axially through a cylindrical FRP casing with minimal direction change, achieving 80-88% static efficiency in its design range. The impeller uses aerofoil-section FRP blades with adjustable pitch angle, allowing the operating point to be tuned on-site by rotating each blade in its hub socket.

FRP axial flow fans are specified for general ventilation of corrosive atmospheres where the primary requirement is high air change rates rather than high pressure: chemical plant building ventilation, tank farm air circulation, wastewater treatment plant headspace exhaust, and large-open-area fume extraction where the duct resistance is minimal. An axial fan delivering 50,000 m³/h at 200 Pa consumes approximately 5.5 kW, compared to 11 kW for a centrifugal fan delivering the same flow against the same pressure — a 50% energy saving that compounds over the fan’s operating life. XICHENG EP produces FRP axial fans in diameters from 400 mm to 1,800 mm with direct-driven or belt-driven motor arrangements.

Parameter	Specification
Air Volume Range	2,000 — 80,000 m³/h
Static Pressure	50 — 500 Pa
Motor Power	0.55 kW — 15 kW
Fan Diameter	400 mm — 1,800 mm
Blade Type	Adjustable-pitch aerofoil FRP, 4-8 blades

FRP Roof Exhaust Fan

An FRP roof exhaust fan — also called an FRP roof mounted exhaust fan or FRP rooftop exhaust fan — is a vertical-discharge centrifugal or axial fan packaged in a weatherproof FRP housing designed for direct mounting on a roof curb or steel platform. The vertical discharge configuration prevents re-entrainment of exhaust gases into building air intakes by discharging at high velocity (15-20 m/s nozzle velocity) at 3-5 meters above roof level. The weatherproof FRP dome or cowl protects the motor and bearings from rain, snow, and UV exposure, and a bird screen on the discharge prevents nesting inside the fan housing during idle periods.

Roof exhaust fans are the standard termination point for corrosive exhaust duct risers in chemical plants, pharmaceutical facilities, and laboratories, eliminating the need for a separate fan room and discharge stack. The vertical up-blast design with an FRP drain connection at the housing low point manages condensate from saturated exhaust streams, preventing the pooling of corrosive liquid inside the fan casing that would cause imbalance on restart. XICHENG EP FRP roof exhaust fans are available in centrifugal (higher pressure, for ducted systems) and axial (higher volume, for general ventilation) configurations from 400 mm to 1,400 mm fan diameter.

Parameter	Specification
Air Volume Range	1,500 — 55,000 m³/h
Static Pressure	Up to 1,500 Pa (centrifugal); 300 Pa (axial)
Motor Power	0.75 kW — 30 kW
Fan Diameter	400 mm — 1,400 mm
Discharge Velocity	15-20 m/s nozzle velocity for plume rise

FRP Blower Material Selection & Resin Guide

FRP blower corrosion resistance is determined primarily by the resin system used in the laminate. Two resin chemistries cover the majority of industrial corrosive exhaust applications: unsaturated polyester (UPE) for general acid/alkali service and vinyl ester (VE) for stronger oxidizing agents and higher temperatures. The table below matches resin type to the exhaust stream chemistry it handles:

Resin Type	Suitable For	Max Temp	Not Suitable For
Isophthalic Polyester	General acids (HCl, H₂SO₄ ≤50%), alkalis, salt-laden air	60°C	Strong oxidizers, solvents, HNO₃
Vinyl Ester (Bisphenol-A)	Oxidizing acids, chlorine, bleach, mixed acid fumes, solvents	80°C	Concentrated HNO₃ above 40%, oleum
Vinyl Ester (Novolac)	Strong oxidizing environments, high-temperature acids, chlorinated organics	95°C	Fuming sulfuric acid, molten alkali

Frequently Asked Questions

What is the difference between an FRP blower and a PP blower?

An FRP blower uses fiberglass reinforced plastic for both the housing and impeller, providing high structural strength and a continuous service temperature up to 80°C (vinyl ester) or 95°C (novolac VE). A PP blower uses polypropylene for the impeller with either PP or FRP housing — it offers superior resistance to specific chemicals (wet chlorine, hypochlorite) but is limited to 70°C continuous. FRP blowers are preferred for larger installations (above 25,000 m³/h) where structural rigidity at large impeller diameters is critical. PP/FRP hybrid blowers combine the advantages of both materials for intermediate applications.

How is the impeller balanced?

All XICHENG EP FRP impellers are dynamically balanced to ISO 1940 G6.3 (balance quality grade), which limits the residual unbalance to 6.3 mm/s at operating speed. Balancing is performed on the assembled impeller after the FRP laminate has fully cured, using a two-plane dynamic balancing machine. The impeller is then over-sped to 1.3× design RPM as a proof test. For belt-driven units, the pulley is mounted before final balancing to account for the pulley mass distribution.

Can FRP blowers be used with variable frequency drives?

Yes — all direct-driven FRP blowers are VFD-compatible. The FRP impeller’s natural frequency is designed to be at least 1.3× above the maximum operating speed to avoid resonance through the VFD speed range. For belt-driven blowers, VFD control is also possible, but the minimum speed is limited by the belt drive’s ability to transmit torque at low RPM — typically a 2:1 turndown ratio (50-100% speed) for belt-driven compared to 5:1 (20-100%) for direct-driven.

What maintenance does an FRP blower require?

FRP blowers require significantly less maintenance than coated metal fans in corrosive service. Quarterly: inspect impeller for chemical attack or erosion at the blade tips, check inlet cone clearance (should be 2-4 mm depending on diameter), verify vibration levels at the bearing housing. Annually: replace bearing grease in pillow-block bearings (belt-driven), check belt tension and pulley alignment, inspect the FRP laminate for blistering or delamination at flange joints. FRP blowers do not require repainting, relining, or cathodic protection throughout their service life.

Get an FRP Blower Quote

XICHENG EP manufactures FRP blowers from 500 to 120,000 m³/h in centrifugal, high-pressure, PP/FRP hybrid, axial, and roof exhaust configurations. Every blower is supplied with a factory test report (flow, pressure, power, vibration), material certificates for the resin and glass reinforcement, and an ISO 1940 G6.3 balance certificate. Contact our application engineers with your airflow, static pressure, gas composition, and temperature requirements for a performance curve and quotation within 48 hours.

About XICHENG EP

XICHENG EP LTD is an industrial air pollution control equipment manufacturer with 16+ years of production experience, 2,600+ systems shipped, and installations in 60+ countries. We manufacture in China, with in‑house PP sheet extrusion, CNC cutting, hot‑gas welding, and FRP filament winding — every scrubber component from raw material to finished vessel is fabricated under one roof. No outsourced fabrication, no subcontractor delays.

Certifications and Compliance

• CE Marking — Machinery Directive 2006/42/EC, EMC Directive 2014/30/EU
• RoHS — 2011/65/EU compliant materials throughout
• ISO 9001:2015 — Quality management system
• ISO 14001:2015 — Environmental management system
• SGS material testing — PP sheet, FRP laminate, weld integrity verified
• Design basis per EU 2010/75/EU Industrial Emissions Directive
• Engineered to meet US EPA NESHAP and OSHA 1910.94

How to Order

1. Send your operating data: Gas flow rate (CFM or m³/hr), contaminant type and inlet concentration (ppm), required outlet limit per your permit, gas temperature, and available site footprint. Contact our engineering team
2. Receive your proposal: Within 48 hours — preliminary sizing, process flow diagram, budget price, and delivery timeline. No obligation
3. Review and approve: Once the proposal meets your requirements, we issue a formal quotation with detailed technical specifications
4. Drawing approval: P&ID, general arrangement, and electrical schematic for your sign‑off before fabrication begins
5. Manufacturing and testing: 6‑10 weeks fabrication. Pre‑shipment water‑tightness test, recirculation test, and control system checkout
6. Shipping and commissioning: Containerized sea freight or air freight worldwide. Remote commissioning support via video call included; optional on‑site supervision available

Global Shipping

We ship wet scrubber systems worldwide from our manufacturing facility in China. Regular containerized sea freight to ports in North America (Los Angeles, Houston, New York), Europe (Rotterdam, Hamburg, Antwerp), the Middle East (Jebel Ali, Dammam), Southeast Asia (Singapore, Port Klang), and Australia (Sydney, Melbourne). Air freight available for urgent deliveries and smaller systems. All equipment is crated, shrink‑wrapped, and container‑loaded with desiccant for ocean transit.