How does 60Hz electrical frequency affect RC-A fan performance?

In Saudi Arabia's 60Hz power grid, the 4-pole motor operates at higher rotational speeds (1650 to 1740 RPM) compared to 50Hz (1380 to 1450 RPM). This approximately 20% speed increase delivers higher airflow (e.g. 512 CFM vs 428 CFM on RC-200A, and 6,993 CFM vs 5,826 CFM on RC-500A) and higher static pressure.

Can the RC-A centrifugal roof fan be used for commercial kitchen cooking grease hoods?

No. RC-A fans are downblast units designed for clean, non-hazardous general ventilation air. Commercial cooking hoods produce oil vapors and grease mist, which require NFPA 96 and UL 762 compliant Upblast Roof Fans with grease collection troughs and external motor compartments.

Is the RC-A fan suitable for emergency smoke spill extraction?

No. Standard RC-A roof fans are rated for normal ambient air temperatures up to +50°C. Emergency fire smoke ventilation requires Civil Defence approved high-temperature smoke fans certified for 300°C / 2 hours or 400°C / 2 hours (such as the VDO Axial Smoke Extraction Fan).

What materials are used in the construction of the RC-A fan?

The weather cover and casing are constructed from seamless spun aluminum alloy for outdoor weather resistance. The backward centrifugal wheel is fabricated from aluminum, and the internal motor drive support chassis is made from heavy-gauge galvanized steel.

How do I size the roof opening and curb for an RC-A fan?

The mounting schedule specifies two key dimensions: the duct penetration opening (DxD) and the outer base plate (LxL). Sizes RC-200A, RC-260A, and RC-320A require a 220×220 mm duct opening on a 420×420 mm base. Sizes RC-360A and RC-400A require a 410×410 mm duct opening on a 610×610 mm base. Sizes RC-450A and RC-500A require a 560×560 mm duct opening on a 760×760 mm base.

Are the airflow figures free-air or static pressure duty points?

The airflow values listed in the specification table represent aerodynamic operating points at the stated static pressure (e.g. 870 m³/h @ 61.5 Pa for RC-200A at 60Hz, and 11,882 m³/h @ 344 Pa for RC-500A at 60Hz). When selecting a fan, compare your calculated duct system resistance against the published curve.

Can RC-A centrifugal roof fans be speed-controlled?

Yes. Models can be controlled using compatible electronic voltage speed regulators or Variable Frequency Drives (VFDs) for three-phase units, allowing airflow adjustment to match varying occupancy demand.

What documentation is available for engineering submittals in Saudi Arabia?

Cloud Electricals provides the official RC-A technical catalogue PDF with dimensional drawings and performance curves, project quotations, manufacturer compliance certificates, and commercial registration documents (CR, VAT, ISO, COC).

How is the RC-A roof fan sealed against rainwater seepage?

The fan base plate features an engineered stepped flashing profile that sheds water outward away from the roof penetration. During installation, continuous closed-cell EPDM gasket tape is applied between the roof curb top and the fan base before tightening the perimeter anchor bolts.

RC-A Series • 512 to 6,993 CFM (60Hz)

Centrifugal Roof Fan

RC-A downblast centrifugal roof exhaust fans featuring backward-curved aluminum impellers, spun aluminum weather casings, and high static pressure capability (up to 344 Pa at 60Hz) for ducted commercial and industrial roof ventilation across Saudi Arabia.

Request Quote on WhatsApp Call Technical Sales Download RC-A Catalogue PDF

In brief

What is the RC-A centrifugal roof fan?

The RC-A is a downblast centrifugal rooftop ventilator (870 to 11,882 m³/h / 512 to 6,993 CFM at 60Hz) designed for ducted clean-air exhaust systems. Its backward-curved aluminum centrifugal wheel overcomes static pressure resistance up to 344 Pa, making it the ideal choice for multi-story restroom risers, commercial core exhaust, and ducted shopping mall ventilation.

RC-A Centrifugal Roof Fan

Verified 50/60Hz duty points

Backward centrifugal impeller (up to 344 Pa)

Saudi Arabia project supply

RC-A Centrifugal Roof Fan

Fan Category

Centrifugal Roof Fan

Product Series

RC-A Downblast Centrifugal Roof Fan

Airflow Span

512 to 6,993 CFM (60Hz) / 870 to 11,882 m³/h

Static Pressure

43 to 344 Pa Static Pressure Span

Impeller Type

Backward-Curved Aluminum Centrifugal Wheel

Curb & Duct Sizes

Base 420–760 mm / Duct 220–560 mm

Application Check

Is the RC-A centrifugal roof fan suitable for your rooftop project?

Evaluate system static pressure, duct penetration size, operating frequency, and airstream composition before ordering.

Good fit

Commercial building ducted rooftop exhaust and general air extraction
Toilet, restroom, and washroom riser exhaust systems in hotels and offices
Shopping malls, institutional complexes, and commercial retail core exhaust
Rooftop ventilation requiring backward-curved pressure development to overcome duct friction

Confirm first

Total system static pressure: verify duct, filter, and louver loss is within 43–344 Pa curve
Operating frequency: confirm 60Hz (Saudi standard, 1650–1740 RPM) vs. 50Hz (1380–1450 RPM)
Roof curb and duct opening size: 220×220 mm to 560×560 mm duct penetration
Electrical supply: verify single-phase 220–240V or three-phase 380V supply at roof level

Use another documented fan

Commercial kitchen cooking grease hoods (select Upblast Roof Fan with UL 762 grease drains)
Open non-ducted warehouse ventilation (select high-CFM DWT Axial Roof Fan)
Emergency high-temperature fire smoke spill (select Civil Defence approved VDO Smoke Fan)
Corrosive acid chemical laboratory or explosive ATEX fume exhaust (select FRP / ATEX Fan)

Airstream boundary & operating limit: Operating limit and clean-air boundary: RC-A centrifugal roof fans are engineered specifically for clean, non-hazardous general ventilation air up to +50°C. They are strictly NOT approved for commercial kitchen cooking grease hoods (which require NFPA 96 / UL 762 compliant upblast centrifugal roof fans with external motors and grease collection drains), emergency smoke spill systems (which require Civil Defence certified 300°C/2hr or 400°C/2hr rated smoke fans), or corrosive/explosive laboratory airstreams.

Model Performance

RC-A Centrifugal Roof Fan Unbundled 50Hz & 60Hz Specifications

Explore exact verified performance pairs mapping frequency, impeller diameter, rotational speed, power, airflow (m³/h & CFM), static pressure, and curb/duct dimensions.

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Model Code	Frequency	Impeller Size	Power (kW)	Speed (RPM)	Airflow (m³/h / CFM)	Static Pressure	Base Plate (L×L)	Duct Inlet (D×D)
RC-200A	50Hz	8" (200 mm)	0.12 kW (4P)	1,380 RPM	728 m³/h / 428 CFM	43.0 Pa	420 × 420 mm	220 × 220 mm
RC-200A	60Hz*	8" (200 mm)	0.12 kW (4P)	1,650 RPM	870 m³/h / 512 CFM	61.5 Pa	420 × 420 mm	220 × 220 mm
RC-260A	50Hz	10" (260 mm)	0.18 kW (4P)	1,380 RPM	1,204 m³/h / 709 CFM	90.0 Pa	420 × 420 mm	220 × 220 mm
RC-260A	60Hz*	10" (260 mm)	0.18 kW (4P)	1,650 RPM	1,440 m³/h / 847 CFM	129.0 Pa	420 × 420 mm	220 × 220 mm
RC-320A	50Hz	12" (320 mm)	0.25 kW (4P)	1,380 RPM	2,007 m³/h / 1,181 CFM	159.0 Pa	420 × 420 mm	220 × 220 mm
RC-320A	60Hz*	12" (320 mm)	0.25 kW (4P)	1,650 RPM	2,400 m³/h / 1,413 CFM	227.0 Pa	420 × 420 mm	220 × 220 mm
RC-360A	50Hz	14" (360 mm)	0.55 kW (4P)	1,380 RPM	3,513 m³/h / 2,067 CFM	169.0 Pa	610 × 610 mm	410 × 410 mm
RC-360A	60Hz*	14" (360 mm)	0.55 kW (4P)	1,650 RPM	4,200 m³/h / 2,472 CFM	242.0 Pa	610 × 610 mm	410 × 410 mm
RC-400A	50Hz	16" (400 mm)	0.75 kW (4P)	1,400 RPM	4,813 m³/h / 2,833 CFM	133.0 Pa	610 × 610 mm	410 × 410 mm
RC-400A	60Hz*	16" (400 mm)	0.75 kW (4P)	1,680 RPM	5,775 m³/h / 3,399 CFM	192.0 Pa	610 × 610 mm	410 × 410 mm
RC-450A	50Hz	18" (450 mm)	1.50 kW (4P)	1,450 RPM	7,097 m³/h / 4,177 CFM	181.0 Pa	760 × 760 mm	560 × 560 mm
RC-450A	60Hz*	18" (450 mm)	1.50 kW (4P)	1,740 RPM	8,517 m³/h / 5,013 CFM	260.0 Pa	760 × 760 mm	560 × 560 mm
RC-500A	50Hz	20" (500 mm)	2.20 kW (4P)	1,450 RPM	9,901 m³/h / 5,826 CFM	239.0 Pa	760 × 760 mm	560 × 560 mm
RC-500A	60Hz*	20" (500 mm)	2.20 kW (4P)	1,740 RPM	11,882 m³/h / 6,993 CFM	344.0 Pa	760 × 760 mm	560 × 560 mm

Engineering Basis: Values marked with an asterisk (*) represent standard 60Hz operating conditions across Saudi Arabia (1650 to 1740 RPM). Airflow (m³/h and CFM) and static pressure (Pa) are tested aerodynamic operating points from the official manufacturer catalogue.

Dimensions & Curb Sizing

RC-A Architectural Dimensions & Roof Curb Schedule

Accurate dimensions mapping outer base plate (L×L), internal duct opening (D×D), cowl diameter (Ø), total height (H), and mounting bolt hole patterns.

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Model	Impeller Size	Cowl Ø (mm)	Total H (mm)	Flange h (mm)	Base Plate LxL (mm)	Duct Opening DxD (mm)	Mounting Holes
RC-200A	8" (200 mm)	597 mm	430 mm	45 mm	420 × 420 mm	220 × 220 mm	8 - Ø6.5
RC-260A	10" (260 mm)	597 mm	470 mm	45 mm	420 × 420 mm	220 × 220 mm	8 - Ø6.5
RC-320A	12" (320 mm)	597 mm	500 mm	45 mm	420 × 420 mm	220 × 220 mm	8 - Ø6.5
RC-360A	14" (360 mm)	750 mm	530 mm	45 mm	610 × 610 mm	410 × 410 mm	8 - Ø6.5
RC-400A	16" (400 mm)	750 mm	645 mm	45 mm	610 × 610 mm	410 × 410 mm	8 - Ø9.0
RC-450A	18" (450 mm)	840 mm	760 mm	45 mm	760 × 760 mm	560 × 560 mm	8 - Ø9.0
RC-500A	20" (500 mm)	840 mm	790 mm	45 mm	760 × 760 mm	560 × 560 mm	8 - Ø9.0

1. Roof Curb Construction

Build a weatherproof upstand curb minimum 300 mm above finished roof level with outside dimensions matching base plate L×L.

2. Stepped Water Flashing

The RC-A base features stepped water-shedding flashing to deflect rainwater outward away from the roof curb penetration.

3. Continuous EPDM Gasket

Apply continuous closed-cell EPDM gasket tape along the top curb perimeter before bolting down the fan base with stainless steel fasteners.

4. Rooftop Isolator Switch

Mount an IP65 local lockable electrical disconnect switch on the curb upstand for safe rooftop servicing.

Engineering Architecture

Backward-Curved Centrifugal Efficiency & Weather Protection

Engineered for high static pressure development, continuous rooftop operation, and long-term corrosion resistance.

Backward-Curved Aluminum Impeller

Aerodynamically balanced backward centrifugal impeller provides high static pressure development (up to 344 Pa at 60Hz) to overcome duct friction, risers, and discharge louvers.

One-Piece Spun Aluminum Cowl

Seamless spun aluminum weather cover offers 360-degree downward weather protection against wind-driven rain, dust, and intense solar radiation without rusting.

Galvanized Steel Drive Support Plate

Rigid heavy-gauge anti-corrosion galvanized steel internal chassis supports the motor and impeller assembly, minimizing vibration and acoustic transmission into the building structure.

Stepped Anti-Seepage Flashing Base

Engineered square mounting base incorporates stepped water-shedding geometry to ensure positive drainage and prevent rainwater seepage into the roof curb opening.

Key Features

RC-A Centrifugal Roof Fan Engineering Features

Built for high-pressure ducted air extraction, aerodynamic weather protection, and easy rooftop installation.

High-efficiency backward-curved aluminum centrifugal impeller for ducted static pressure duty

One-piece seamless spun aluminum weather cover providing heavy wind-load and corrosion resistance

Rigid anti-corrosion galvanized steel motor drive mechanism support plate

Stepped flashing profile engineered to prevent roof curb rainwater ingress

Factory-fitted galvanized steel protective bird and debris screen

Verified 50Hz and 60Hz performance curves for accurate Saudi Arabian project selection

Standardized roof curb opening sizes matching square duct penetrations from 220×220 to 560×560 mm

Downblast perimeter discharge protecting building roof membranes from direct air impingement

Specifications

Category Technical Specifications

Comprehensive engineering specifications for RC-A downblast centrifugal roof exhaust fans.

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Specification	Engineering Details
Product Category	Roof Fan
Product Type	RC-A Downblast Centrifugal Roof Exhaust Fan
Model Series	RC200-A, RC260-A, RC320-A, RC360-A, RC400-A, RC450-A, RC500-A
Installation	Rooftop curb mounting with vertical duct connection
Airflow Span (60Hz)	870 to 11,882 m³/h (512 to 6,993 CFM verified 60Hz)
Airflow Span (50Hz)	728 to 9,901 m³/h (428 to 5,826 CFM catalog baseline)
Static Pressure Span	43 to 344 Pa across series (61.5 to 344 Pa at 60Hz)
Electrical Supply	220–240V / 60Hz (50Hz compatible), 1-Phase / 3-Phase options
Motor Power Range	0.12 kW (4P) to 2.20 kW (4P)
Impeller Material	Backward-curved centrifugal aluminum alloy impeller
Casing Material	Spun aluminum weather cover with galvanized steel drive plate
Discharge Pattern	Downblast 360-degree perimeter downward discharge
Operating Limits	Clean non-hazardous air up to +50°C (NOT for cooking grease or smoke)
Documentation	RC-A catalog PDF, technical submittal, CR, VAT, and COC on request

Applications

Where RC-A Centrifugal Roof Fans Are Installed

Ducted rooftop air extraction across commercial office complexes, retail shopping centers, institutional buildings, and multi-floor utility risers.

Commercial buildings

Removes: Core exhaust, toilet risers, stale air, and general building relief

Shopping malls

Removes: General concourse exhaust, retail odor, and warm air extraction

Industrial workshops

Removes: General non-hazardous ventilation air and ambient heat buildup

Office buildings

Removes: Central restroom shaft exhaust and tenant utility room air

Storage warehouses

Removes: Solar heat accumulation and non-hazardous general air exchange

Hotel utility areas

Removes: Housekeeping rooms, laundry service corridors, and linen areas

Multi-story roof risers

Removes: Ducted vertical exhaust risers requiring static pressure to discharge

MEP project supply

Removes: Supplied with exact RC-A model, 60Hz curve, and curb drawings

Airstream boundary: RC-A centrifugal roof fans are engineered for general clean ambient air. For commercial cooking grease hoods requiring UL 762 compliance, select a certified Upblast Roof Fan. For open, non-ducted warehouse ventilation requiring high CFM at low pressure, select a DWT Axial Roof Fan. For life-safety emergency smoke extraction, select a VDO Axial Smoke Extraction Fan.

Selection support

What to Send for Correct RC-A Selection

Provide total exhaust CFM, calculated system static pressure (Pa), roof curb and duct penetration opening size, electrical frequency (60Hz vs 50Hz), and project location in Saudi Arabia for immediate engineering quotation.

Required exhaust airflow in CFM or m³/h

Total system static pressure (Pascals) including duct run, filters, dampers, and bends

Operating electrical frequency: 60Hz (Saudi Arabia standard) or 50Hz

Roof curb base dimension (L×L from 420×420 mm to 760×760 mm)

Internal duct opening dimension (D×D from 220×220 mm to 560×560 mm)

Supply voltage: 220–240V Single-Phase or Three-Phase

Airstream confirmation: clean ambient air (verify NO commercial cooking grease or smoke)

Accessory requirements: roof curb, gravity backdraft damper, bird screen, or isolator switch

Quantity of fans required per building zone

Project city and delivery schedule in Saudi Arabia

Accessories

RC-A Centrifugal Roof Fan Accessories & Mounting Options

Coordinate prefabricated roof curbs, gravity backdraft shutters, bird screens, and IP65 isolator switches.

Prefabricated Roof Curbs (matching 420×420 to 760×760 mm base)

Internal Gravity Backdraft Dampers (Shutter Louvers)

Galvanized Steel Bird & Debris Protective Screens

IP65 Local Lockable Rooftop Electrical Isolator Switches

Electronic Speed Controllers & Variable Frequency Drives (VFD)

Vibration Isolator Gasket Tape and Mounting Fasteners

Downloads

Documents & Procurement Files

Download the official RC-A centrifugal roof fan catalogue PDF and request contractor submittal files.

RC-A Centrifugal Roof Fan Catalogue PDFDownload PDF

RC-A Technical Submittal & Cut SheetRequest Submittal

Cloud Electricals Company ProfileRequest Profile

Saudi Commercial Compliance (CR/VAT/COC)Request Compliance Docs

RC-A Engineering Selection & Curve ScheduleRequest Curve Schedule

Related Commercial & Industrial Roof Fans

Explore other rooftop and inline ventilation fan categories for complete project ventilation schedules.

Upblast Roof Fan

Axial Roof Fan

Downblast Roof Fan

Centrifugal Box Inline Fan

FAQ

RC-A Centrifugal Roof Fan Questions

Answers for HVAC consultants, MEP contractors, and building procurement engineers reviewing RC-A centrifugal roof exhaust fans in Saudi Arabia.

The RC-A centrifugal roof fan uses a backward-curved centrifugal impeller that generates higher static pressure (up to 344 Pa at 60Hz), making it ideal for ducted exhaust networks, restroom risers, and multi-floor shafts. Axial roof fans (such as the DWT series) deliver very high airflow volumes at lower static pressure (<350 Pa) for open, non-ducted roof relief.

Quotation Request

Request RC-A Centrifugal Roof Fan Quotation

Send your required RC-A model, airflow target (CFM), static pressure (Pa), frequency (60Hz vs 50Hz), and project city in Saudi Arabia.

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Name / CompanyPhone / WhatsAppProject CityQuantityBuilding Type & ApplicationVoltageRC-A Model Code or Impeller SizeRequired Airflow (CFM / m³/h) & Static Pressure (Pa)Duct Opening (D x D mm) & Curb Base (L x L mm)Frequency & Electrical Supply PreferenceApplicationRequirement DetailsI agree that Cloud Electricals may use these details to respond to my inquiry as described in the Privacy Policy and Website Terms.

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Centrifugal Roof Fan

What is the RC-A centrifugal roof fan?

Is the RC-A centrifugal roof fan suitable for your rooftop project?

RC-A Centrifugal Roof Fan Unbundled 50Hz & 60Hz Specifications

RC-A Architectural Dimensions & Roof Curb Schedule

Backward-Curved Centrifugal Efficiency & Weather Protection

RC-A Centrifugal Roof Fan Engineering Features

Category Technical Specifications

Where RC-A Centrifugal Roof Fans Are Installed

Commercial buildings

Shopping malls

Industrial workshops

Office buildings

Storage warehouses

Hotel utility areas

Multi-story roof risers

MEP project supply

What to Send for Correct RC-A Selection

RC-A Centrifugal Roof Fan Accessories & Mounting Options

Documents & Procurement Files

Related Commercial & Industrial Roof Fans

RC-A Centrifugal Roof Fan Questions

What is the difference between the RC-A centrifugal roof fan and an axial roof fan?

How does 60Hz electrical frequency affect RC-A fan performance?

Can the RC-A centrifugal roof fan be used for commercial kitchen cooking grease hoods?

Is the RC-A fan suitable for emergency smoke spill extraction?

What materials are used in the construction of the RC-A fan?

How do I size the roof opening and curb for an RC-A fan?

Are the airflow figures free-air or static pressure duty points?

Can RC-A centrifugal roof fans be speed-controlled?

What documentation is available for engineering submittals in Saudi Arabia?

How is the RC-A roof fan sealed against rainwater seepage?

Request RC-A Centrifugal Roof Fan Quotation