Three-quarter view of orange FRP corrosion-resistant centrifugal exhaust fan

Cleanroom HVAC and Air Handling Equipment

FRP Corrosion-Resistant Exhaust Fan

A roof-upblast or sidewall centrifugal exhaust fan with molded FRP wetted parts for corrosive laboratory and process air.

12–40 in. Fan Series
200–35,000 CFM Range
Up to 2.5 in. w.g.
Roof or Sidewall Mounting

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Product Introduction

The fan uses a molded dome housing and a single-piece backward-inclined impeller reinforced with glass fiber in a corrosion-resistant vinyl-ester resin system. Its scroll has a smooth, resin-rich internal surface, while UV inhibitors protect the external molding in outdoor service. Hardware exposed to the exhaust path is encapsulated in FRP, and the carbon-steel shaft is isolated by the impeller hub, an internal FRP cap and an O-ring. A neoprene hub seal is standard, with a PTFE seal available for more severe chemical environments.

Key Features

The flat-bladed backward-inclined impeller provides non-overloading centrifugal performance and is balanced as a complete rotating assembly.

Direct-drive and belt-drive arrangements allow the motor selection and service layout to suit the required duty point and installation space.

Dedicated openings draw ambient cooling air through the motor cover instead of using contaminated exhaust air for motor ventilation.

Available roof curbs, bird screens, flexible connectors and vibration isolators complete the weather-side and duct-side installation interfaces.

Customer Product Concerns

Reliable corrosive exhaust depends on matching the resin, fan duty and installation details to the actual gas composition and duct system.

A resin that tolerates one acid may soften or blister in a different solvent, concentration or temperature.Select the vinyl-ester resin and any optional liner from the actual chemical composition, concentration and exhaust temperature.

Choosing the fan only by duct diameter can leave insufficient airflow once filters, elbows and stacks add resistance.Size the wheel and motor from the scheduled airflow and total static pressure on the published fan curve, including accessory losses.

Condensate pools at the bottom of the scroll and concentrates aggressive chemicals.Place the drain at the true low point, route it to a compatible disposal connection and include the scroll in the wash-down schedule.

An undersized roof curb or rigid duct connection transfers wind and fan vibration into the building structure.Match the curb opening and support dimensions to the selected fan size and use a flexible connector plus correctly rated isolators.

Typical Applications

Pharmaceutical laboratory fume exhaustChemical storage and blending roomsWastewater and odor-control stationsBattery production exhaust systemsPool and high-humidity corrosive ventilation

Technical Parameters

Typical construction ranges for an industrial FRP centrifugal exhaust fan are listed below.

Core Material	Vinyl-ester fiberglass-reinforced plastic housing and impeller with external metallic drive support
Panel Thickness	5–12 mm nominal molded FRP structural laminate, with local reinforcement at flanges and supports
Effective Width	780–1690 mm overall fan width across the 12–40 in. RBK size range
Maximum Length	Up to 1702 mm overall roof-upblast fan height
Steel Facing Thickness	1.2 mm (18-gauge) galvanized steel roof-curb sheet; fiberglass curb construction is optional
Core Density	1500–1900 kg/m³ cured FRP laminate
Thermal Conductivity	0.25–0.40 W/(m·K) for the FRP laminate
Surface Finish	Smooth resin-rich interior with a UV-inhibited exterior gel coat in gray, safety orange or a selected industrial color
Joint Type	Molded curb-cap or sidewall interface with duct transition, neoprene or PTFE hub seal and FRP-isolated shaft penetration
Customization	Available based on the intended application and operating environment.

Available Options

Direct-drive or belt-drive arrangementRoof-upblast or sidewall discharge configurationAlternative resin system for the exhaust chemistryDrain fitting, flexible connector and vibration isolators

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