Cloud Electricals Coالعربية
RCD Series • 2,500 to 30,000 CFM (60Hz)

Downblast Roof Fan

RCD downblast centrifugal rooftop exhaust fans featuring laser-cut steel housings, one-time stretch aluminum alloy base plates, and direct-drive or belt-drive 60Hz configurations (0.5 to 20.0 HP) for commercial and industrial clean-air ventilation across Saudi Arabia.

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In brief

What is the RCD downblast roof fan?

The RCD is a roof-mounted downward-discharge centrifugal exhaust fan (2,500 to 30,000 CFM at 60Hz) engineered for ducted and non-ducted clean-air ventilation. It offers compact direct-drive configurations for zero belt maintenance (models RCD08 to RCD24) and adjustable belt-drive configurations with tool-free hand access covers (models RCD10 to RCD40) for high-airflow factory and warehouse relief.

RCD downblast roof fan with spun aluminum weather cowl and heavy-gauge base for commercial and industrial exhaust
RCD Downblast Roof Fan
Verified 60Hz drive configurations
Direct & belt drive options (0.5–20 HP)
Saudi Arabia project supply
Fan Category
Downblast Roof Fan
Product Series
RCD Direct & Belt Drive Series
Airflow Span
2,500 to 30,000 CFM (across series at 60Hz)
Motor Power Range
0.5 HP to 20.0 HP (60Hz Single & Three Phase)
Impeller Diameters
12.5" (318 mm) to 40.0" (1016 mm)
Drive Mechanism
Direct Drive (DD) & Belt Drive (BD) Options
Application Check

Is the RCD downblast roof fan suitable for your rooftop project?

Evaluate airflow requirements, drive selection (direct vs. belt), electrical supply (60Hz), and airstream composition before ordering.

Good fit
  • Commercial building ducted general rooftop exhaust and bathroom riser shafts
  • Industrial factories, manufacturing assembly plants, and warehouse ventilation
  • Agricultural facilities and livestock building non-corrosive air relief
  • Low-noise continuous ventilation requiring downward perimeter discharge
Confirm first
  • Operating duty point: required airflow (CFM) at system static pressure (Pa)
  • Drive preference: Direct-Drive (compact, zero belt maintenance) vs. Belt-Drive (adjustable field RPM)
  • Site electrical supply: verify Single-Phase 220V vs. Three-Phase 220V/380V 60Hz
  • Roof curb rough-in opening dimension and weather flashing upstand height
Use another documented fan
  • Commercial kitchen cooking grease hoods (select Upblast Roof Fan with UL 762 grease drains)
  • Certified emergency high-temperature smoke spill (select Civil Defence approved VDO Smoke Fan)
  • Hazardous, flammable, or explosive ATEX gas environments (select certified Explosion-Proof Fan)
  • Corrosive acid chemical laboratory exhaust (select specialized FRP Fan)
Airstream boundary & safety limit: Operating limit and safety boundary: Standard RCD downblast roof fans are engineered exclusively 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) or explosive atmospheres. High-temperature 280°C/30min service is an optional factory-configured build requiring specific engineering submittal documentation.
Model Specifications

RCD Downblast Roof Fan Unbundled 60Hz Specifications

Explore verified 60Hz performance configurations separating direct-drive (DD) and belt-drive (BD) models across all 11 sizes from RCD08 to RCD40.

Swipe horizontally to compare all model columns.

Model / CodeDrive TypeImpeller Dia.Motor Power (HP)Speed (RPM)Voltage / Phase (60Hz)Rated Max Airflow
RCD08-DDDirect Drive12.5" (318 mm)0.5 HP1,720 RPM1~220V / 3~380V 60HzUp to 2,500 CFM
RCD10-BDBelt Drive14.0" (356 mm)0.75 - 1.0 HP1,400 RPM1~220V / 3~380V 60HzApprox. 3,100 CFM
RCD10-DDDirect Drive14.0" (356 mm)0.75 - 1.0 HP1,720 RPM1~220V / 3~380V 60HzUp to 3,800 CFM
RCD14-BDBelt Drive16.0" (406 mm)1.0 - 1.5 HP1,400 RPM1~220V / 3~380V 60HzApprox. 3,900 CFM
RCD14-DDDirect Drive16.0" (406 mm)1.0 - 1.5 HP1,720 RPM1~220V / 3~380V 60HzUp to 4,700 CFM
RCD16-BDBelt Drive18.0" (457 mm)1.5 - 2.0 HP1,300 RPM1~220V / 3~380V 60HzApprox. 5,400 CFM
RCD16-DDDirect Drive18.0" (457 mm)1.5 - 2.0 HP1,720 RPM1~220V / 3~380V 60HzUp to 7,000 CFM
RCD18-BDBelt Drive20.0" (508 mm)1.5 - 2.0 HP1,000 RPM1~220V / 3~380V 60HzApprox. 5,800 CFM
RCD18-DDDirect Drive20.0" (508 mm)2.0 HP1,130 / 1,300 RPM1~220V / 3~380V 60HzUp to 7,600 CFM
RCD20-DDDirect Drive22.0" (559 mm)2.0 - 3.0 HP1,130 RPM1~220V / 3~380V 60HzUp to 8,200 CFM
RCD20-BDBelt Drive22.0" (559 mm)2.0 - 3.0 HP1,250 RPM1~220V / 3~380V 60HzUp to 9,400 CFM
RCD24-BDBelt Drive25.0" (635 mm)2.0 - 4.0 HP900 RPM1~220V / 3~380V 60HzApprox. 9,800 CFM
RCD24-DDDirect Drive25.0" (635 mm)2.0 - 4.0 HP1,120 RPM1~220V / 3~380V 60HzUp to 12,000 CFM
RCD28-BDBelt Drive28.0" (711 mm)3.0 - 7.5 HP750 / 1,000 RPM3~220V / 380V 60Hz11,500 - 15,500 CFM
RCD28-DDDirect Drive28.0" (711 mm)5.5 - 7.5 HP1,120 RPM3~220V / 380V 60HzUp to 17,500 CFM
RCD32-BDBelt Drive32.0" (813 mm)5.5 - 10.0 HP750 / 1,000 RPM3~220V / 380V 60Hz12,800 - 16,800 CFM
RCD32-DDDirect Drive32.0" (813 mm)7.5 - 10.0 HP1,120 RPM3~220V / 380V 60HzUp to 18,800 CFM
RCD36-DDDirect Drive36.0" (914 mm)10.0 - 15.0 HP1,000 RPM3~220V / 380V 60HzUp to 18,500 CFM
RCD36-BDBelt Drive36.0" (914 mm)10.0 - 15.0 HP1,120 RPM3~220V / 380V 60HzUp to 20,500 CFM
RCD40-BDBelt Drive40.0" (1016 mm)15.0 - 20.0 HP1,000 RPM3~220V / 380V 60HzUp to 26,000 CFM
RCD40-DDDirect Drive40.0" (1016 mm)15.0 - 20.0 HP1,120 RPM3~220V / 380V 60HzUp to 30,000 CFM
Engineering Basis: All listed models operate at 60Hz Saudi standard electrical supply. Airflows shown represent rated catalog maxima at free delivery / low resistance; select actual operating duty point from official RCD static pressure curves according to ductwork and backdraft damper resistance.
Dimensions & Curb Sizing

RCD Architectural Dimensions & Roof Curb Schedule

Accurate dimensions mapping impeller diameter, drive options, motor power span, rated max airflow, and roof curb mounting for models RCD08 through RCD40.

Swipe horizontally to view all dimensional values.

Model SizeImpeller Dia.Drive OptionsMotor Power SpanMax Airflow (60Hz)Base MountingTarget Applications
RCD0812.5" (318 mm)Direct Drive0.5 HP2,500 CFMRoof Curb MountingRestroom & utility exhaust
RCD1014.0" (356 mm)Direct / Belt Drive0.75 - 1.0 HP3,800 CFMRoof Curb MountingCommercial building exhaust
RCD1416.0" (406 mm)Direct / Belt Drive1.0 - 1.5 HP4,700 CFMRoof Curb MountingOffice & workshop ventilation
RCD1618.0" (457 mm)Direct / Belt Drive1.5 - 2.0 HP7,000 CFMRoof Curb MountingCommercial hall relief
RCD1820.0" (508 mm)Direct / Belt Drive1.5 - 2.0 HP7,600 CFMRoof Curb MountingLight manufacturing exhaust
RCD2022.0" (559 mm)Direct / Belt Drive2.0 - 3.0 HP9,400 CFMRoof Curb MountingWarehouse general ventilation
RCD2425.0" (635 mm)Direct / Belt Drive2.0 - 4.0 HP12,000 CFMRoof Curb MountingFactory & assembly halls
RCD2828.0" (711 mm)Direct / Belt Drive3.0 - 7.5 HP17,500 CFMRoof Curb MountingHigh-volume plant exhaust
RCD3232.0" (813 mm)Direct / Belt Drive5.5 - 10.0 HP18,800 CFMRoof Curb MountingLarge distribution centers
RCD3636.0" (914 mm)Direct / Belt Drive10.0 - 15.0 HP20,500 CFMRoof Curb MountingHeavy industrial buildings
RCD4040.0" (1016 mm)Direct / Belt Drive15.0 - 20.0 HP30,000 CFMRoof Curb MountingMassive industrial extraction
1. Upstand Roof Curb
Build a solid concrete or structural steel curb minimum 300 mm above roof waterproofing level with outside dimensions matching the fan base.
2. Weatherproofing Seal
Apply continuous closed-cell EPDM gasket tape on top of the curb landing before lowering the fan to ensure an airtight, watertight perimeter seal.
3. Perimeter Base Anchoring
Fasten the one-time stretch aluminum base plate to the curb using stainless steel anchoring bolts with neoprene vibration-isolation washers.
4. Rooftop Isolator Switch
Install a local IP65 lockable electrical disconnect switch on the curb upstand to enable safe servicing without shutting down main panel breakers.
Engineering Architecture

Downblast Centrifugal Design & Maintenance Accessibility

Engineered for high airflow volume, robust weather shielding, and fast rooftop servicing.

Direct-Drive & Belt-Drive Modularity
Offers direct-drive for compact zero-maintenance operation (0.5 to 20 HP) or belt-drive with adjustable pulleys for precise field airflow tuning and motor isolation.
Laser-Cut Steel Body & Aluminum Base
Constructed with high-precision laser-cut steel structural casing and a one-time stretch formed aluminum alloy mounting base for superior structural rigidity.
Hand-Accessible Stainless Drive Cavity
Tool-free hand-opening stainless steel drive cavity cover enables rapid, safe routine inspection, belt tensioning, and bearing maintenance on the rooftop.
Downblast Perimeter Weather Protection
360-degree downward perimeter discharge pattern protects building roof membranes from direct air impingement and prevents wind-driven rain penetration.
Key Features

RCD Downblast Roof Fan Engineering Features

Precision laser-cut construction, dynamic balancing, and versatile drive options for commercial and industrial projects.

Fully molded and fully welded steel housing engineered for heavy-duty industrial rooftop duty

High-efficiency direct-drive and belt-drive transmission options across 11 model sizes

One-time stretch aluminum alloy base providing robust corrosion resistance and light rooftop load

Stainless steel drive cavity cover with tool-free hand access for fast routine maintenance

Dynamic impeller balancing strictly complying with ISO 1940 Grade G4.0 standards

Verified 60Hz motor performance packages matching Saudi Arabian 220V/380V power networks

Stepped flashing profile engineered to prevent roof curb rainwater ingress and pooling

Standardized curb mounting dimensions for straightforward contractor installation and replacement

Specifications

Category Technical Specifications

Comprehensive engineering specifications for RCD downblast centrifugal rooftop exhaust fans.

Swipe horizontally to compare all columns.

SpecificationEngineering Details
Product CategoryRoof Fan
Product TypeRCD Downblast Centrifugal Roof Exhaust Fan
Model SeriesRCD08, RCD10, RCD14, RCD16, RCD18, RCD20, RCD24, RCD28, RCD32, RCD36, RCD40
InstallationRooftop curb mounting with downward perimeter discharge
Airflow Span (60Hz)2,500 to 30,000 CFM across series (select at system resistance)
Impeller Diameter Span12.5" (318 mm) to 40.0" (1016 mm) centrifugal wheel
Motor Power Range0.5 HP to 20.0 HP (60Hz standard motors)
Electrical Supply1~220V / 60Hz or 3~220V/380V / 60Hz (50Hz available)
Drive ConfigurationsDirect Drive (DD) & Belt Drive (BD) with adjustable pulleys
Housing MaterialLaser-cut steel body with one-time stretch aluminum alloy base
Drive Cover MaterialStainless steel hand-removable access cover
Impeller BalancingDynamic balance conforming to ISO 1940 Grade G4.0
Operating LimitsClean non-hazardous air up to +50°C (NOT for cooking grease hoods)
DocumentationRCD 60Hz catalogue PDF, technical submittal, CR, VAT, and COC on request
Applications

Where RCD Downblast Roof Fans Are Installed

Clean ambient air exhaust across manufacturing plants, distribution warehouses, commercial buildings, and utility riser shafts.

Factory ventilation

Removes: Warm air, non-hazardous process air, and ambient manufacturing heat

Industrial roof exhaust

Removes: Heat buildup, stale air, and general warehouse extraction

Commercial buildings

Removes: Central building air relief, multi-story risers, and utility room exhaust

Restroom & washroom risers

Removes: Moisture, humidity, and stale air in commercial facilities

Storage warehouses

Removes: Trapped solar heat and non-hazardous general air exchange

Agricultural buildings

Removes: Warm air, moisture, and general non-corrosive livestock ventilation

Workshops & utility spaces

Removes: General ventilation air and machinery ambient heat

MEP contractor supply

Removes: Supplied with exact RCD model, drive code, 60Hz curve, and curb drawings

Airstream boundary: RCD downblast roof fans are engineered exclusively for clean general ventilation air. For commercial cooking grease hoods requiring UL 762 compliance, select a certified Upblast Roof Fan. For ducted medium-pressure clean air relief with backward-curved aluminum wheels, select an RC-A Centrifugal Roof Fan. For life-safety emergency smoke extraction, select a VDO Axial Smoke Extraction Fan.
Selection support

What to Send for Correct RCD Selection

Provide required exhaust airflow (CFM), calculated system static pressure (Pa), drive type preference (Direct vs Belt), roof curb dimensions, electrical voltage/phase (60Hz), and project city in Saudi Arabia.

01

Required exhaust airflow in CFM at calculated system static pressure (Pa)

02

Drive type preference: Direct Drive (DD) or Belt Drive (BD)

03

Building roof curb opening and mounting base dimension

04

Electrical supply: Single-Phase 220V or Three-Phase 220V/380V 60Hz

05

Preferred motor speed (RPM) or acoustic sound limit (dB(A))

06

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

07

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

08

Quantity of fans required per building zone

09

Project city and delivery schedule in Saudi Arabia

10

Contractor submittal documentation requirements (CR, VAT, ISO, COC)

Accessories

RCD Downblast Roof Fan Accessories & Mounting Options

Coordinate prefabricated roof curbs, gravity backdraft dampers, bird protective screens, and IP65 local isolator switches.

Prefabricated Steel and Concrete Roof Curbs

Internal Gravity Backdraft Dampers (Shutter Louvers)

Heavy-Duty Galvanized Steel Bird & Debris Protective Screens

IP65 Local Lockable Rooftop Electrical Isolator Switches

Variable Frequency Drives (VFD) & Electronic Speed Controllers

Vibration Isolator Gasket Tape and Neoprene Mounting Hardware

Downloads

Documents & Procurement Files

Download the official RCD 60Hz downblast roof fan catalogue PDF and request contractor submittal files.

RCD 60Hz Downblast Roof Fan Catalogue PDFDownload PDF
RCD Technical Submittal & Cut SheetRequest Submittal
Cloud Electricals Company ProfileRequest Profile
Saudi Commercial Compliance (CR/VAT/COC)Request Compliance Docs
RCD Engineering Selection & Curve ScheduleRequest Curve Schedule
Related Products

Related Commercial & Industrial Roof Fans

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

Upblast Roof Fan
Upblast Roof Fan
Centrifugal Roof Fan
Centrifugal Roof Fan
Axial Roof Fan
Axial Roof Fan
Centrifugal Box Inline Fan
Centrifugal Box Inline Fan
FAQ

RCD Downblast Roof Fan Questions

Answers for HVAC consultants, MEP contractors, and building procurement engineers reviewing RCD downblast roof exhaust fans in Saudi Arabia.

Direct-drive (DD) models connect the motor shaft directly to the impeller wheel, providing a compact unit profile with zero belt maintenance downtime. Belt-drive (BD) models isolate the motor outside the exhaust airstream and utilize adjustable pulleys, allowing on-site RPM and airflow adjustment for large industrial applications.

Quotation Request

Request RCD Downblast Roof Fan Quotation

Send your required RCD model size, drive type (Direct vs Belt Drive), airflow target (CFM), static pressure (Pa), electrical supply (60Hz), and project city in Saudi Arabia.

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