Can the DWT axial roof fan be used for commercial kitchen grease exhaust?

No. DWT axial roof fans are engineered exclusively for clean, non-hazardous ambient ventilation air. Commercial kitchen cooking hoods accumulate grease and oil vapors, requiring UL 762 and NFPA 96 compliant centrifugal Upblast Roof Fans equipped with external motors, grease collection troughs, and drain ports.

Is the DWT series suitable for emergency fire smoke extraction?

No. Standard DWT roof fans are rated for normal ambient air temperatures up to +50°C. Emergency smoke spill 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 electrical supply options are available in Saudi Arabia?

DWT fans support standard Saudi Arabian 60Hz power networks. Smaller models (DWT3# to DWT4#) operate on either Single-Phase 230V or Three-Phase 380V. Larger sizes (DWT5# to DWT8#) offer dedicated Single-Phase 230V or Three-Phase 380V motor windings depending on power rating.

What do the speed options (960 RPM vs. 1420 RPM) mean for model selection?

Sizes DWT5# through DWT8# offer dual speed options. The 960 RPM winding delivers lower noise levels (68 to 78 dB(A)) with moderate airflow for noise-sensitive halls. The 1420 RPM winding delivers maximum air displacement (up to 17,647 CFM) and higher static pressure (up to 345 Pa) for heavy industrial ventilation.

How do I size the roof opening and curb for a DWT fan?

Each DWT model corresponds to a specific roof curb opening dimension (G×G). For example, DWT3# requires a 400×400 mm opening, DWT5# requires 650×650 mm, and DWT8# requires 1000×1000 mm. The curb upstand should be built at least 300 mm above the finished roof level to ensure complete waterproofing.

Are DWT performance figures free-air ratings or total pressure ratings?

The airflow values listed in the DWT specification table (e.g. 941 CFM for DWT3# up to 17,647 CFM for DWT8#) represent tested operating performance at the stated total pressure (Pt) in Pascals. Always verify that total duct and curb resistance does not exceed the fan's pressure capacity.

What materials are used in the construction of the DWT fan?

The discharge cowl is spun from corrosion-resistant aluminum alloy to resist outdoor weather and UV exposure. The mounting base plate and motor support housing are fabricated from heavy-gauge carbon steel with a baked anti-corrosion protective finish.

What documentation can Cloud Electricals provide for contractor approval?

Cloud Electricals provides the official DWT axial roof fan technical datasheet PDF, project quotation, dimensional submittal drawings, manufacturer compliance certificates, and commercial registration documents (CR, VAT, ISO, COC).

How is the DWT axial roof fan installed on the roof curb?

The fan is mounted directly over the prepared curb with closed-cell EPDM gasket tape between the curb top and the fan base plate (L×L). It is securely anchored using 4 stainless steel bolts through the perimeter mounting holes (N-ØK) and wired to a local IP65 isolator switch.

DWT Series • 941 to 17,647 CFM

Axial Roof Fan

Q: What is the difference between an axial roof fan and a centrifugal roof fan?

An axial roof fan (such as the DWT series) moves air parallel to the fan shaft. It excels at delivering very high airflow volumes (up to 17,647 CFM) at relatively low static pressure ( 500 Pa) using radial centrifugal wheels, making them suitable for long duct networks, filters, and kitchen grease hoods.

Heavy-duty DWT direct-drive axial roof fans designed for high-volume, low-to-medium static pressure general roof ventilation in warehouses, factories, mechanical plant rooms, and commercial facilities across Saudi Arabia.

Request Quote on WhatsApp Call Technical Sales Download DWT Datasheet PDF

In brief

What is the DWT axial roof fan?

The DWT axial roof fan is a high-volume rooftop ventilator (1,600 to 30,000 m³/h / 941 to 17,647 CFM) mounted directly on roof curb openings from 400×400 mm to 1000×1000 mm. Built with a 100% copper motor, spun aluminum cowl, and direct-drive impeller, it provides reliable non-hazardous building air relief at static pressures up to 345 Pa.

DWT Axial Roof Fan

Verified 60Hz DWT configurations

Direct roof curb mounting (400–1000mm)

Saudi Arabia project supply

DWT Axial Roof Fan

Fan Category

Axial Roof Fan

Product Series

DWT Direct-Drive Axial Roof Fan

Airflow Span

941 to 17,647 CFM (1,600 to 30,000 m³/h)

Static Pressure

65 to 345 Pa Total Pressure (Pt)

Motor & Electrical

1~230V & 3~380V / 60Hz 100% Copper Motor

Curb Opening Sizes

400×400 mm up to 1000×1000 mm (G×G)

Application Check

Is the DWT axial roof fan suitable for your rooftop project?

Evaluate system static pressure, airstream composition, roof curb dimensions, and electrical supply before ordering.

Good fit

Industrial warehouses, storage depots, and logistics distribution centers
Factory assembly halls, light manufacturing plants, and packing workshops
Sports arenas, gymnasiums, and exhibition pavilions requiring high air exchange
Mechanical plant rooms, chiller yards, and commercial building roof relief shafts

Confirm first

Roof curb rough-in opening dimension (G×G from 400×400 mm to 1000×1000 mm)
Site electrical supply: verify 1-Phase 230V vs. 3-Phase 380V 60Hz availability
Operating speed selection: 960 RPM (lower noise) vs. 1420 RPM (higher CFM and pressure)
System static pressure: confirm duct and louver resistance is within DWT envelope (<350 Pa)

Use another documented fan

Commercial kitchen cooking grease hoods (select Upblast Roof Fan with UL 762 grease drains)
High-pressure ducted ventilation networks (select Centrifugal Roof Fan)
Emergency high-temperature smoke spill systems (select Civil Defence approved VDO Smoke Fan)
Corrosive chemical acid or explosive ATEX fume exhaust (select Explosion-Proof / FRP Fan)

Airstream boundary & operating limit: Operating limit and airstream boundary: DWT axial roof fans are engineered exclusively for clean, non-hazardous ambient 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 grease collection troughs), 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

DWT Axial Roof Fan Unbundled Performance Configurations

Explore exact verified performance pairs mapping speed (960 vs 1420 RPM), power, airflow (m³/h & CFM), total static pressure (Pt), noise, and roof curb openings.

Swipe horizontally to compare all model columns.

Model / Config	Electrical Supply	Power (kW / HP)	Speed (RPM)	Airflow (m³/h / CFM)	Static Press. (Pt)	Sound dB(A)	Curb Opening (G×G)
DWT3#	1~230V / 3~380V 60Hz	0.08 kW / 0.1 HP	1420 RPM	1,600 m³/h / 941 CFM	65 Pa	≤ 65 dB(A)	400 × 400 mm
DWT3.5#	1~230V / 3~380V 60Hz	0.37 kW / 0.5 HP	1420 RPM	3,700 m³/h / 2,176 CFM	130 Pa	≤ 67 dB(A)	440 × 440 mm
DWT4#	1~230V / 3~380V 60Hz	0.55 kW / 0.8 HP	1420 RPM	5,300 m³/h / 3,118 CFM	166 Pa	≤ 72 dB(A)	470 × 470 mm
DWT5# (Low Speed)	1~230V / 3~380V 60Hz	0.37 kW / 0.5 HP	960 RPM	7,700 m³/h / 4,529 CFM	98 Pa	≤ 68 dB(A)	650 × 650 mm
DWT5# (High Speed 1-Ph)	1~230V 60Hz	0.75 kW / 1.0 HP	1420 RPM	9,300 m³/h / 5,471 CFM	196 Pa	≤ 74 dB(A)	650 × 650 mm
DWT5# (High Speed 3-Ph)	3~380V 60Hz	0.75 kW / 1.0 HP	1420 RPM	9,300 m³/h / 5,471 CFM	196 Pa	≤ 74 dB(A)	650 × 650 mm
DWT6# (Low Speed)	1~230V / 3~380V 60Hz	1.10 kW / 1.5 HP	960 RPM	13,000 m³/h / 7,647 CFM	176 Pa	≤ 71 dB(A)	770 × 770 mm
DWT6# (High Speed 1-Ph)	1~230V 60Hz	2.20 kW / 3.0 HP	1420 RPM	18,700 m³/h / 11,000 CFM	294 Pa	≤ 75 dB(A)	770 × 770 mm
DWT6# (High Speed 3-Ph)	3~380V 60Hz	2.20 kW / 3.0 HP	1420 RPM	18,700 m³/h / 11,000 CFM	294 Pa	≤ 75 dB(A)	770 × 770 mm
DWT7# (1-Ph High Speed)	1~230V 60Hz	2.20 kW / 3.0 HP	1420 RPM	24,000 m³/h / 14,118 CFM	300 Pa	≤ 78 dB(A)	900 × 900 mm
DWT7# (3-Ph Low Speed)	3~380V 60Hz	2.20 kW / 3.0 HP	960 RPM	23,000 m³/h / 13,529 CFM	195 Pa	≤ 75 dB(A)	900 × 900 mm
DWT7# (3-Ph High Speed)	3~380V 60Hz	3.00 kW / 4.0 HP	1420 RPM	24,500 m³/h / 14,412 CFM	315 Pa	≤ 78 dB(A)	900 × 900 mm
DWT8# (Low Speed)	1~230V / 3~380V 60Hz	2.20 kW / 3.0 HP	960 RPM	28,000 m³/h / 16,471 CFM	196 Pa	≤ 78 dB(A)	1000 × 1000 mm
DWT8# (3-Ph High Speed)	3~380V 60Hz	4.00 kW / 5.4 HP	1420 RPM	30,000 m³/h / 17,647 CFM	345 Pa	≤ 81 dB(A)	1000 × 1000 mm

Engineering Basis: Airflow (m³/h and CFM) represents tested operating displacement at the specified total static pressure (Pt in Pascals) and rotational speed. Noise levels dB(A) are measured at 1.0 m hemispherical distance in free field conditions. Voltage and phase supply (230V 1-Ph or 380V 3-Ph) must be verified during procurement inquiry.

Dimensions & Curb Sizing

DWT Roof Curb Rough-In & Structural Framing Schedule

Accurate architectural curb opening dimensions (G×G), base plate dimensions (L×L), cowl diameter (ØA), and anchor hole patterns.

Swipe horizontally to view all dimensional values.

Model	Cowl ØA (mm)	Total H (mm)	Hood h (mm)	Duct ØD (mm)	Base Plate LxL (mm)	Curb Opening GxG (mm)	Holes N-ØK	Plate Thickness δ
DWT3#	720 mm	485 mm	205 mm	320 mm	440 × 440 mm	400 × 400 mm	4 - Ø10	3 mm
DWT3.5#	720 mm	485 mm	205 mm	370 mm	480 × 480 mm	440 × 440 mm	4 - Ø10	3 mm
DWT4#	720 mm	525 mm	205 mm	420 mm	520 × 520 mm	470 × 470 mm	4 - Ø14	3 mm
DWT5#	1124 mm	610 mm	270 mm	520 mm	700 × 700 mm	650 × 650 mm	4 - Ø14	3 mm
DWT6#	1124 mm	680 mm	270 mm	620 mm	900 × 900 mm	770 × 770 mm	4 - Ø14	3 mm
DWT7#	1334 mm	770 mm	310 mm	720 mm	1000 × 1000 mm	900 × 900 mm	4 - Ø14	5 mm
DWT8#	1480 mm	800 mm	360 mm	820 mm	1100 × 1100 mm	1000 × 1000 mm	4 - Ø14	5 mm

1. Concrete / Steel Curb

Build a weatherproof upstand curb minimum 300 mm above finished roof level matching outside dimension G×G.

2. Continuous Gasket Seal

Apply continuous closed-cell EPDM/neoprene gasket tape along the curb landing before seating the fan base (L×L).

3. Stainless Anchor Bolts

Secure through the 4 perimeter base holes (N-ØK) using stainless steel anchor bolts with isolation washers.

4. Rooftop Isolator Switch

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

Engineering Architecture

Direct-Drive Efficiency & Severe Climate Protection

Engineered for harsh rooftop solar exposure, continuous operation, and minimal maintenance downtime.

100% Copper Motor & Low Temp Rise

Equipped with a heavy-duty copper-wound motor with thermal rise rating ≤ 50K for continuous, reliable operation in high-ambient Saudi Arabian summer climates up to +50°C.

Direct-Drive Aerodynamic Impeller

Wide-chord axial blades mounted directly on the motor shaft eliminate belts, pulleys, and routine tension maintenance while maximizing airflow delivery.

Spun Aluminum Weatherproof Cowl

High-grade spun aluminum discharge cowl provides 360-degree aerodynamic weather protection against rain, sand, and high ambient solar radiation.

Heavy-Gauge Structural Steel Base

Precision-formed carbon steel flanged base plate (L×L) with anti-corrosion coating mates cleanly onto standardized concrete or steel roof curb upstands.

Key Features

DWT Axial Roof Fan Engineering Features

Built for high air displacement, aerodynamic weather protection, and easy rooftop maintenance.

100% copper-wound electric motor engineered for continuous-duty industrial roof service

Low motor temperature rise (≤ 50K) ensuring long insulation life in high ambient environments

Corrosion-resistant spun aluminum discharge cowl designed for severe rooftop weather exposure

Rigid heavy-gauge carbon steel mounting base with factory-drilled anchor bolt holes

Dual-speed motor options on sizes DWT5# to DWT8# for acoustic and airflow flexibility

Unbundled single-phase 220–240V and three-phase 380V 60Hz/50Hz electrical configurations

Direct curb mounting matching standardized roof openings from 400×400 mm to 1000×1000 mm

Direct-drive simplicity eliminating belt wear, pulley alignment, and routine adjustment downtime

Specifications

Category Technical Specifications

Comprehensive engineering specifications for DWT axial roof ventilation fans.

Swipe horizontally to compare all columns.

Specification	Engineering Details
Product Category	Roof Fan
Product Type	DWT Direct-Drive Axial Roof Ventilation Fan
Model Series	DWT3#, DWT3.5#, DWT4#, DWT5#, DWT6#, DWT7#, DWT8#
Installation	Direct rooftop curb mounting (400×400 mm up to 1000×1000 mm)
Airflow Span	1,600 to 30,000 m³/h (941 to 17,647 CFM across series)
Static Pressure Span	65 to 345 Pa Total Pressure (Pt)
Operating Noise	≤ 65 to ≤ 81 dB(A) at 1.0 m hemispherical free-field
Electrical Supply	1~220–240V / 60Hz or 3~380V / 60Hz (50Hz compatible)
Motor Construction	100% copper windings, continuous duty, temperature rise ≤ 50K
Cowl Material	Spun aluminum alloy weather cowl with anti-corrosion finish
Base & Housing	Structural carbon steel base plate with baked protective coating
Impeller Type	Wide-chord direct-drive axial flow impeller
Operating Limits	Clean non-hazardous air up to +50°C (NOT for grease or smoke)
Documentation	DWT catalog datasheet PDF, technical submittal, CR, VAT, and COC on request

Applications

Where DWT Axial Roof Fans Are Installed

High-volume direct roof exhaust across industrial manufacturing, warehousing, sports complexes, and commercial plant rooms.

Industrial warehouses

Removes: Trapped solar heat, stuffy indoor air, and general warehouse fumes

Factory assembly plants

Removes: Process heat, ambient odors, and warm air in large open manufacturing halls

Logistics distribution hubs

Removes: High-volume air exchange across expansive high-ceiling loading zones

Sports complexes & gyms

Removes: Accumulated body heat, moisture, and stuffiness in large sports halls

Mechanical plant rooms

Removes: Equipment heat from pumps, chillers, electrical switchgear, and generators

Parking roof relief shafts

Removes: General non-hazardous exhaust and solar heat buildup in multi-level garages

Commercial roof shafts

Removes: Central building air relief and non-hazardous exhaust through rooftop curbs

MEP contractor supply

Removes: Supplied with exact DWT model selection, electrical phase, and curb drawings

Airstream boundary: DWT axial 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 high-pressure ducted rooftop exhaust, select a Centrifugal Roof Fan. For life-safety emergency smoke extraction, select a VDO Axial Smoke Extraction Fan.

Selection support

What to Send for Correct DWT Selection

Provide total airflow target, estimated system static pressure, roof curb opening size, electrical supply, and project location in Saudi Arabia for immediate engineering quotation.

Required total exhaust airflow in CFM or m³/h

Estimated system static pressure (Pt in Pascals, typically <350 Pa for open roof discharge)

Building roof curb opening size (G×G from 400×400 mm to 1000×1000 mm)

Site electrical supply: Single-Phase 230V 60Hz or Three-Phase 380V 60Hz

Preferred operating speed: 960 RPM (quiet low-speed) vs. 1420 RPM (high-capacity)

Acoustic noise criteria (dB(A) limit at site perimeter)

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

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

Quantity of fans required per roof zone

Project city and delivery schedule in Saudi Arabia

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

Accessories

DWT Axial Roof Fan Accessories & Mounting Options

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

Prefabricated Steel and Concrete Roof Curbs

Internal Gravity Backdraft Dampers (Shutter Louvers)

Heavy-Duty Stainless Steel Protective Bird / Debris Screens

IP65 Local Lockable Rooftop Electrical Isolator Switches

Variable Frequency Drives (VFD) & Motor Starter Panels

Vibration Isolation Gaskets and Neoprene Mounting Hardware

Downloads

Documents & Procurement Files

Download the official DWT axial roof fan technical datasheet PDF and request contractor submittal files.

DWT Axial Roof Fan Datasheet PDFDownload PDF

DWT Technical Submittal & Cut SheetRequest Submittal

Cloud Electricals Company ProfileRequest Profile

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

DWT Engineering Selection & Schedule SheetRequest Schedule Sheet

Related Commercial & Industrial Roof Fans

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

Upblast Roof Fan

Centrifugal Roof Fan

Downblast Roof Fan

KDK Steel Square Exhaust Fan

FAQ

DWT Axial Roof Fan Questions

Answers for HVAC consultants, MEP contractors, and industrial procurement engineers reviewing DWT axial roof ventilation fans in Saudi Arabia.

An axial roof fan (such as the DWT series) moves air parallel to the fan shaft. It excels at delivering very high airflow volumes (up to 17,647 CFM) at relatively low static pressure (<350 Pa) for direct open roof relief. Centrifugal roof fans generate higher static pressure (often >500 Pa) using radial centrifugal wheels, making them suitable for long duct networks, filters, and kitchen grease hoods.

Quotation Request

Request DWT Axial Roof Fan Quotation

Send your required DWT model, airflow target (CFM), static pressure (Pa), roof curb opening size, and project city in Saudi Arabia.

WhatsApp Instead

Name / CompanyPhone / WhatsAppProject CityQuantityBuilding Type & ApplicationVoltageDWT Model or Impeller SizeRequired Airflow (CFM / m³/h) & Static Pressure (Pa)Roof Curb Opening Size (G x G mm)Speed & 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.

WhatsApp Instead