Can a 230V/50Hz fan be connected directly to a Saudi 60Hz supply?

No. Operating an induction motor designed for 50Hz on a 60Hz electrical supply causes the motor shaft speed to increase by approximately 20% (60/50 ratio). Because aerodynamic load on a centrifugal impeller increases with the cube of the speed, shaft power demand increases by up to 70%, leading to rapid thermal overload, winding burnout, and voiding of manufacturer warranties.

What does the 'L' suffix mean for each model?

In the rosenberg / Saudi Fan type code, 'L' designates a larger drive motor (Größerer Antriebsmotor). The fan casing and duct spigot dimensions remain identical, but the motor incorporates higher wattage and current capacity, providing significantly increased delivered airflow and higher static pressure capability (for example, RS 160 at 70W / 450 CMH vs. RS 160 L at 115W / 660 CMH).

What controller is compatible with the selected motor?

The single-phase external rotor motors used in R and RS fans support 100% infinitely variable speed control using suitable step auto-transformers (such as the rosenberg RE series) or electronic thyristor phase-angle controllers. The controller's rated continuous current must comfortably exceed the fan motor starting current (IA / IN up to 1.9x). Standard domestic light dimmers must never be used.

Which curve should be used for my CFM and static pressure?

Each model size has a dedicated aerodynamic curve sheet in the catalogue (pages 2 through 8) plotting static pressure (Pa) against airflow (m³/h and CFM) across various voltage steps (230V down to 60V). Your required operating duty point must be plotted on the applicable 230V curve. Do not select fans based solely on free-air CFM (0 Pa).

Are thermal contacts and the controller included?

Internal thermal contacts are built into the motor windings for overheat protection. On RS models, they are integrated automatically into the circuit. On R 355 models, separate external thermal leads (TB - TB) must be wired into the control circuit relay. Speed controllers, transformers, duct clamps, and backdraft dampers are optional installation accessories supplied separately upon request.

Which model is quieter at the required duty point?

RS plastic casing models are acoustically superior for radiated casing breakout noise (51 to 57 dB LWA2) due to the sound-dampening qualities of the 8-angular polymer housing. However, high-speed 'L' variants and larger metal models generate higher in-duct sound power. For noise-critical rooms, we recommend selecting an operating point in the mid-range of the curve and installing circular sound attenuators.

What is the construction difference between R and RS models?

RS models (sizes 100 to 315 mm) utilize an injection-molded 8-angular polymer plastic casing that is 100% corrosion proof and rated IP44. R 355 models (355 mm) utilize a heavy-duty cylindrical galvanized sheet-steel casing rated IP54 with an external terminal box and external thermal contact leads for higher-pressure commercial duct systems.

Saudi Fan R / RS Family • 100 to 355 mm (230V 50Hz Baseline)

Saudi Fan R / RS Inline Centrifugal Tube Fan

Circular inline centrifugal tube fan series with corrosion-proof RS polymer 8-angular casings (100–315 mm) and heavy-duty R 355 galvanized steel casings for commercial and industrial ducted ventilation.

Request 60Hz Check on WhatsApp Call Technical Sales Download R/RS Catalogue (PDF, 0.7 MB)

Direct AnswerElectrical compatibility & casing overview

The Saudi Fan R / RS series is an inline centrifugal tube fan family engineered for circular duct ventilation. The range is divided into two casing styles: RS models (100 to 315 mm) featuring an 8-angular corrosion-proof plastic casing (IP44, Class F), and R 355 models (355 mm) featuring a heavy-duty galvanized sheet-steel casing (IP54, Class F). 'L' suffixes indicate larger drive motors with higher wattage, airflow, and static pressure across the same duct diameter. IMPORTANT: The available catalogue data is 230V/50Hz. Direct connection to a Saudi 60Hz power grid causes motor overspeed and overload; written 60Hz factory confirmation or a confirmed 60Hz alternative (such as the TSK Steel or Plastic inline fan) is required before ordering. Need confirmed 60Hz stock? Explore TSK Steel Circular Inline Fans.

Saudi Fan R and RS inline centrifugal tube fans showing R 355 steel casing and RS plastic 8-angular casing

Saudi Fan R / RS Inline Centrifugal Tube Fan

Catalogue baseline: 230V 50Hz (written 60Hz check required)

RS plastic (100–315 mm) & R steel (355 mm) casings

Backward-curved centrifugal impeller & speed control

Saudi Fan R / RS Inline Centrifugal Tube Fan

Fan Category

Circular Inline Centrifugal Tube Fan

Product Family

Saudi Fan R / RS Model Series

Casing Styles

RS Polymer 8-Angular / R 355 Galvanized Steel

Duct Diameter Range

100 to 355 mm (4 to 14 inch)

Airflow Capacity (50Hz)

260 to 2,420 m³/h (approx. 153 to 1,425 CFM free-air)

Electrical Reference

1~230V 50Hz (60Hz requires factory confirmation)

Saudi Arabia 60Hz Electrical Grid & Catalogue Frequency Notice

CRITICAL SAUDI PROJECT NOTICE — 230V 50Hz ELECTRICAL BASELINE: The published catalogue performance and curves shown on this page are strictly rated for 230V 50Hz single-phase power. Saudi Arabian building projects operate on a 60Hz electrical grid. Do not order or connect these fans to a 60Hz supply until the exact 60Hz motor winding, rotational speed, full-load current, delivered airflow, static pressure, sound levels, and warranty validity are confirmed in writing by the manufacturer. If your project requires readily available 60Hz certified fans, consider our TSK Steel Circular Inline Fan (50/60Hz dual rated) or Multi-Brand Plastic Inline Fan.

Casing Engineering & Type Code

RS Plastic vs. R 355 Steel & 'L' Motor Variants

Understand the structural differences between RS polymer housings and R galvanized steel housings, plus what the 'L' suffix signifies for motor output.

RS Series: Plastic 8-Angular Housing (100–315 mm)

Polymer Construction

Duct diameters: 100, 125, 160, 200, 250, 315 mm

Eight-sided injection-molded plastic casing providing total corrosion resistance in damp environments
Extremely low radiated noise levels; well suited for hotels, executive offices, clinics, and restrooms
IP44 motor protection rating with external IP54 terminal box for simple electrical hookup
Insulation Class F motor winding with integrated auto-reset thermal contacts
Straight-through circular spigots with integrated mounting bracket geometry
Standard wiring diagram 01.009 (single-phase 230V line, neutral, ground, and run capacitor)

R 355 Series: Galvanized Sheet Steel Housing (355 mm)

Steel Construction

Duct diameter: 355 mm (14 inch) heavy duty

Heavy-duty cylindrical casing manufactured from corrosion-protected galvanized sheet steel
High-pressure backward-curved centrifugal impeller generating up to 920 Pa maximum static pressure
IP54 protection rating throughout casing body, motor enclosure, and external terminal box
Insulation Class F motor with dedicated external thermal contact leads (TB - TB) for relay interlocking
Universal mounting capability in horizontal, vertical, or angled duct orientations
Wiring diagram 01.024 requiring thermal contact integration into motor control circuit

Understanding the 'L' Suffix: Larger Drive Motor

Power Variant

Größerer Antriebsmotor (Larger Motor Step-Up)

'L' designates a larger, higher-powered motor fitted inside the exact same casing dimensions
RS 160 (70 W / 450 CMH / 300 Pa) vs. RS 160 L (115 W / 660 CMH / 420 Pa): +47% airflow, +40% pressure
RS 200 (115 W / 780 CMH / 410 Pa) vs. RS 200 L (160 W / 880 CMH / 490 Pa): +13% airflow, +20% pressure
RS 250 (115 W / 880 CMH / 450 Pa) vs. RS 250 L (160 W / 960 CMH / 490 Pa): +9% airflow, +9% pressure
RS 315 (220 W / 1,320 CMH / 520 Pa) vs. RS 315 L (300 W / 1,750 CMH / 720 Pa): +33% airflow, +38% pressure
R 355 (260 W / 1,290 RPM / 2,050 CMH) vs. R 355 L (610 W / 2,340 RPM / 2,420 CMH / 920 Pa)

Saudi Fan R vs RS casing construction and model designation guide

50Hz Aerodynamic Schedule

Saudi Fan R / RS Performance Table (230V 50Hz)

Catalogue performance data extracted from rosenberg official test curves. Maximum airflow (CMH / CFM) represents free-air delivery at 0 Pa static pressure; project airflow must be selected from published curves at design system pressure. 60Hz suitability requires written factory confirmation.

230V 50Hz Catalogue Baseline

Swipe horizontally to compare model casing, power, current, noise, CMH, CFM, and static pressure.

Model	Casing Style	Duct Ø	Power P1	Current IN	Speed	Capacitor	Noise (LWA2/5/6)	Max Flow (50Hz)	Approx. CFM	Max Pa	Curve Ref
RS 100 L	Plastic 8-angular	100 mm	0.033 kW (33 W)	0.14 A	2,250 RPM	2.0 µF	51 / 62 / 60 dB	260 CMH	153 CFM approx.	265 Pa	p. 2
RS 125 L	Plastic 8-angular	125 mm	0.065 kW (65 W)	0.30 A	2,415 RPM	2.0 µF	51 / 63 / 61 dB	340 CMH	200 CFM approx.	310 Pa	p. 3
RS 160	Plastic 8-angular	160 mm	0.070 kW (70 W)	0.30 A	2,400 RPM	2.0 µF	49 / 61 / 57 dB	450 CMH	265 CFM approx.	300 Pa	p. 4
RS 160 L	Plastic 8-angular	160 mm	0.115 kW (115 W)	0.49 A	2,440 RPM	3.0 µF	55 / 68 / 66 dB	660 CMH	390 CFM approx.	420 Pa	p. 4
RS 200	Plastic 8-angular	200 mm	0.115 kW (115 W)	0.50 A	2,395 RPM	3.0 µF	52 / 66 / 65 dB	780 CMH	460 CFM approx.	410 Pa	p. 5
RS 200 L	Plastic 8-angular	200 mm	0.160 kW (160 W)	0.70 A	2,540 RPM	5.0 µF	57 / 70 / 68 dB	880 CMH	520 CFM approx.	490 Pa	p. 5
RS 250	Plastic 8-angular	250 mm	0.115 kW (115 W)	0.50 A	2,450 RPM	3.0 µF	51 / 65 / 64 dB	880 CMH	520 CFM approx.	450 Pa	p. 6
RS 250 L	Plastic 8-angular	250 mm	0.160 kW (160 W)	0.65 A	2,560 RPM	5.0 µF	55 / 68 / 67 dB	960 CMH	565 CFM approx.	490 Pa	p. 6
RS 315	Plastic 8-angular	315 mm	0.220 kW (220 W)	0.95 A	2,540 RPM	5.0 µF	54 / 70 / 72 dB	1,320 CMH	780 CFM approx.	520 Pa	p. 7
RS 315 L	Plastic 8-angular	315 mm	0.300 kW (300 W)	1.30 A	2,390 RPM	8.0 µF	57 / 74 / 73 dB	1,750 CMH	1,030 CFM approx.	720 Pa	p. 7
R 355	Galvanized steel	355 mm	0.260 kW (260 W)	1.15 A	1,290 RPM	5.0 µF	54 / 65 / 66 dB	2,050 CMH	1,210 CFM approx.	280 Pa	p. 8
R 355 L	Galvanized steel	355 mm	0.610 kW (610 W)	2.60 A	2,340 RPM	12.0 µF	65 / 75 / 76 dB	2,420 CMH	1,425 CFM approx.	920 Pa	p. 8

Curve Sizing Methodology: Free-air airflow in the schedule occurs at 0 Pa static resistance. Real-world duct networks create friction and component pressure loss (duct runs, elbows, backdraft shutters, filters). Always cross-reference your required CFM and Pa against the published 230V 50Hz curve sheet before sizing. For Saudi 60Hz projects, submit your duty point for engineering verification or evaluate our dual-rated 60Hz models.

Saudi Fan R / RS 50Hz aerodynamic performance schedule

Electrical & Control Guidelines

Speed Control, Thermal Protection & Wiring Standards

Critical electrical criteria for operating single-phase external rotor motors with auto-transformers or electronic controllers.

1. Compatible Controller Types

Catalogue specifies 100% infinitely variable speed control using auto-transformers (such as rosenberg RE series 5-step transformers) or solid-state electronic phase-angle controllers approved for single-phase external rotor motors.

2. Controller Current & Safety Margin

The selected controller's continuous current rating must safely exceed the motor starting current (IA / IN up to 1.9x listed in technical tables). Sizing controllers exactly at rated current IN risks nuisance tripping during startup.

3. Thermal Contacts Interlock Mandate

On R 355 models, the separate thermal contact leads (TB - TB) must be wired directly into the motor control relay circuit to de-energize the motor automatically upon overtemperature. Bypassing thermal leads voids all manufacturer warranties.

4. Saudi 60Hz Speed Control Advisory

Controllers must be matched to project utility frequency. Connecting a 50Hz motor or controller directly to a 60Hz supply without manufacturer validation will cause excessive harmonics, audible hum, and overheating.

Product Overview

Compact Centrifugal Tube Fan Engineering

The Saudi Fan R / RS series is designed for straightforward in-duct mounting within circular duct ventilation networks. By combining a backward-curved centrifugal impeller wheel with a straight-through axial discharge geometry, these units overcome duct friction losses more effectively than low-pressure axial duct fans.

The series is engineered across two distinct body materials: the RS series features an eight-sided corrosion-proof plastic casing for sizes 100 through 315 mm, offering acoustic insulation and rust immunity for damp utility spaces and washrooms. For larger 355 mm commercial ducts, the R 355 utilizes a robust galvanized sheet-steel casing rated IP54 with dedicated external thermal contact terminals (`TB - TB`).

Electrical baseline reminder: published curves represent 230V/50Hz testing. For Saudi 60Hz building projects, contact our engineering team for motor verification or consider our certified 60Hz product ranges such as the TSK Steel Circular Inline Fan or Plastic Inline Duct Fan.

Key Features

Saudi Fan R / RS Series Highlights

Engineering characteristics of the circular inline centrifugal tube fan range.

Direct-drive external rotor motor design with backward-curved centrifugal impeller

Corrosion-proof 8-angular plastic casing on RS models (sizes 100 to 315 mm)

Heavy-gauge galvanized sheet steel cylindrical casing on R 355 models

Extremely low casing-radiated sound levels (51 to 57 dB LWA2 on RS plastic range)

Insulation Class F motor winding with embedded or wired thermal contact protection

External IP54 terminal box for safe, accessible field electrical connections

100% infinitely variable speed control via approved step-transformers or electronic controllers

Universal installation orientation: horizontal, vertical, or ceiling suspended with brackets

Specifications

Category Technical Specifications

Engineering parameters for the Saudi Fan R / RS centrifugal inline tube fan series.

Swipe horizontally to view all specifications.

Specification	Engineering Details
Product Category	Inline Fan / Centrifugal Tube Fan
Product Type	Circular Inline Centrifugal Tube Fan
Brand / Series	Saudi Fan R / RS Series (rosenberg engineering baseline)
Casing Construction	RS: 8-angular polymer plastic (100–315 mm); R: Galvanized sheet steel (355 mm)
Impeller Construction	Backward-curved centrifugal single impeller with axial straight-through outlet
Duct Diameter Range	100 mm (4"), 125 mm (5"), 160 mm (6"), 200 mm (8"), 250 mm (10"), 315 mm (12.5"), 355 mm (14")
Published Voltage & Frequency	1~230V / 50Hz (Catalogue baseline; 60Hz requires written factory confirmation)
Free-Air Flow Range (50Hz)	260 to 2,420 m³/h (approx. 153 to 1,425 CFM catalog free-air rating)
Max Static Pressure (50Hz)	Up to 920 Pa (R 355 L) and 720 Pa (RS 315 L) at zero airflow
Motor Protection	Integrated thermal contacts on RS; dedicated TB-TB external thermal leads on R 355
Motor Insulation / Ingress	Insulation Class F; IP44 motor on RS, IP54 on R 355, IP54 external terminal box
Max Airstream Temperature	Continuous clean air: +45 °C to +70 °C depending on specific motor size

Accessories

Matching Duct Installation & Control Accessories

Optional controls, mounting hardware, and duct components compatible with R / RS tube fans.

Five-Step Auto-Transformer Speed Controller (rosenberg RE series)

Electronic Solid-State Variable Speed Controller (ED series)

Quick-Release Circular Duct Clamps with Vibration-Damping Rubber (VBM)

Spring-Loaded Circular Backdraft Shutter Dampers (RSK)

Flexible Duct Canvas Connectors with Metal Collar Flanges

Heavy-Duty Steel Mounting Foot Brackets with Anti-Vibration Bushings

Applications

Where Saudi Fan R / RS Fans Are Deployed

Ducted clean-air supply, exhaust, and transfer applications across commercial and light industrial buildings.

Ducted commercial exhaust

General inline extraction through circular spiral or flexible duct runs

Restrooms & washrooms

Odor, moisture, and stale air evacuation with corrosion-proof RS plastic casing

Utility & service rooms

Compact inline extraction for electrical closets, janitor rooms, and store spaces

Fresh air transfer & booster

Continuous supply and transfer air circulation through long duct networks

Commercial offices & clinics

Quiet ventilation where low breakout radiated noise is required (RS series)

MEP duct engineering supply

Supplied with catalogue performance curve data and submittal compliance files

Industrial duct ventilation

High-pressure ducted air transfer using heavy-duty R 355 steel casing models

Maintenance & controls supply

Compatible with matching step-transformers, backdraft shutters, and clamps

Project alternative note: If your project schedule requires immediate delivery of confirmed 60Hz fans with factory submittals, explore the TSK Steel Circular Inline Fan (220–230V 50/60Hz dual rated) or our lightweight Plastic Inline Duct Fan series. For life-safety fire smoke ventilation, refer to the VDO High-Temperature Smoke Extraction Fan.

Selection Support

What to Send for R / RS Fan Selection

Provide your operating duty point (CFM or m³/h at static pressure Pa), circular duct diameter, 60Hz project verification requirement, and delivery city in Saudi Arabia.

Required design airflow in CFM or m³/h at calculated system static pressure (not free-air CFM)

Calculated external static pressure in Pa (duct friction, elbows, dampers, filters, and louvers)

Nominal circular duct spigot diameter: 100, 125, 160, 200, 250, 315, or 355 mm

Electrical supply confirmation: Saudi 60Hz project compatibility check requirement

Casing preference: RS corrosion-proof polymer plastic vs. R 355 heavy galvanized steel

Acoustic target: evaluate casing radiated noise (LWA2) vs. in-duct noise (LWA5/LWA6)

Speed controller requirements: 5-step auto-transformer (RE) vs. electronic control

Installation accessories: quick-release duct clamps (VBM), backdraft shutters (RSK), and brackets

Downloads

Documents & Technical Curve Files

Download the official Saudi Fan R / RS tube fan catalogue (PDF, 0.7 MB, 8 pages) and view 50Hz aerodynamic curves for consultant review.

Download R / RS catalogue PDF (0.7 MB)Download PDF

View RS 125 L curve (p. 3)View 50Hz Curve

View RS 315 & 315 L curve (p. 7)View 50Hz Curve

View R 355 & 355 L curve (p. 8)View 50Hz Curve

Request technical submittal & 60Hz checkRequest Submittal

Related Commercial & Industrial Inline Fans

Explore other axial and centrifugal inline fan series with confirmed 60Hz availability or heavy-duty commercial construction.

Plastic Inline Duct Fan

Multi-brand polymer inline fans (AMX & VENTS) with confirmed 60Hz availability in Saudi Arabia

View Details

Steel Circular Inline Duct Fan (TSK)

Galvanized steel circular centrifugal inline fan with dual 220–230V 50/60Hz catalogue ratings

View Details

Centrifugal Box Inline Fan

Acoustic cabinet inline centrifugal fan for high-static, quiet commercial ducted supply and exhaust

View Details

VDO Axial Smoke Extraction Fan

Certified high-temperature axial fan (300°C/2h & 400°C/2h) for emergency fire smoke extraction

View Details

FAQ

R / RS Tube Fan Questions

Clear technical answers regarding electrical frequency, motor variants, speed controllers, and casing materials.

The official manufacturer catalogue data published for the R/RS series is tested and rated for 230V at 50Hz. Before purchasing or installing on a Saudi Arabian 60Hz project, written factory confirmation must be obtained verifying whether a 60Hz motor winding, capacitor, and approved operating curve are available for the specific model. If immediate 60Hz delivery is required, we recommend evaluating the TSK Steel Circular Fan or Plastic Inline Fan series.

Quotation Request

Request Saudi Fan R / RS Inline Tube Fan Quotation

Submit your required operating airflow (CFM or m³/h), system static pressure (Pa), circular duct diameter, 60Hz electrical compatibility check, and delivery city in Saudi Arabia. Our engineering team will review duty points and controller options.

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Saudi Fan R / RS Inline Centrifugal Tube Fan

Saudi Arabia 60Hz Electrical Grid & Catalogue Frequency Notice

RS Plastic vs. R 355 Steel & 'L' Motor Variants

Saudi Fan R / RS Performance Table (230V 50Hz)

Speed Control, Thermal Protection & Wiring Standards

Compact Centrifugal Tube Fan Engineering

Saudi Fan R / RS Series Highlights

Category Technical Specifications

Matching Duct Installation & Control Accessories

Where Saudi Fan R / RS Fans Are Deployed

Ducted commercial exhaust

Restrooms & washrooms

Utility & service rooms

Fresh air transfer & booster

Commercial offices & clinics

MEP duct engineering supply

Industrial duct ventilation

Maintenance & controls supply

What to Send for R / RS Fan Selection

Documents & Technical Curve Files

Related Commercial & Industrial Inline Fans

Plastic Inline Duct Fan

Steel Circular Inline Duct Fan (TSK)

Centrifugal Box Inline Fan

VDO Axial Smoke Extraction Fan

R / RS Tube Fan Questions

Are the published R/RS models available at 60Hz?

Can a 230V/50Hz fan be connected directly to a Saudi 60Hz supply?

What does the 'L' suffix mean for each model?

What controller is compatible with the selected motor?

Which curve should be used for my CFM and static pressure?

Are thermal contacts and the controller included?

Which model is quieter at the required duty point?

What is the construction difference between R and RS models?

Request Saudi Fan R / RS Inline Tube Fan Quotation