Can the RMD fan be mounted on walls as well as roofs?

Yes. The RMD series features a dual-application mounting design. It can be installed over a standard roof curb or mounted horizontally through an exterior wall using optional heavy-duty wall mounting brackets and a gravity backdraft damper.

How does static pressure affect the airflow of RMD fans?

As direct-drive axial fans, RMD units achieve maximum airflow at 0" SP (free air) and experience airflow reduction as system static pressure rises. Models RMD-10, RMD-12, and RMD-14 operate effectively up to 0.375" to 0.75" SP, while RMD-18 maintains performance up to 0.875" SP (218 Pa). For higher-resistance ducted systems, select the RC-A Centrifugal Roof Fan.

What is the maximum operating temperature for RMD fans?

The RMD series has a maximum rated operating temperature of 110°F (43.3°C). It is strictly rated for clean, ambient ventilation air and must NEVER be used for commercial kitchen grease exhaust (which requires UL 762 Upblast Roof Fans) or emergency fire smoke spill.

Why must contractors consult factory certified prints before construction?

Datasheet dimensions are published for preliminary layout and equipment selection. Because curb upstands and wall openings require exact tolerances, Cloud Electricals provides certified submittal prints that must be approved prior to site framing and cutting.

What electrical supply is standard for RMD fans in Saudi Arabia?

Standard motors operate on single-phase 220–240V at 50Hz/60Hz (matching Saudi Arabia's 220V 60Hz single-phase network). Full Load Amps (FLA) range from 1.1A on the RMD-10 to 4.5A on the RMD-18. 115V 1-phase motors are available upon request.

What items are included as standard features versus optional accessories?

Every standard RMD fan includes a heavy-duty spun aluminum housing, die-formed axial impeller, totally enclosed ball bearing motor, factory-installed bird screen, internal wire conduit, and a local disconnect switch. Optional accessories include 20-gauge steel roof curbs, gravity dampers, motorized dampers, and wall mounting brackets.

What models and airflow capacities are available in the RMD series?

The series comprises four model sizes: RMD-10 (10" / 500 CFM), RMD-12 (12" / 830 CFM), RMD-14 (14" / 1,160 CFM), and RMD-18 (18" / 2,400 CFM).

How is the RMD fan mounted and sealed against weather?

When roof-mounted, the fan sits over a prepared upstand curb with continuous closed-cell EPDM gasket tape applied to the curb top landing. The spun aluminum weather cowl overhangs the base to deflect wind-driven rain away from the roof penetration.

What documentation is available for engineering submittals in Saudi Arabia?

Cloud Electricals provides official manufacturer datasheets, verified 8-point static pressure matrices, certified dimensional prints, CR, VAT, and Certificate of Conformity (COC) documentation.

RMD Series • 500 to 2,400 CFM (60Hz)

RMD Direct Drive Axial Roof Fan

Q: What is the RMD direct-drive axial roof fan best suited for?

The RMD series is designed as an economical, low-cost exhaust solution for commercial and industrial applications with little or no ductwork, such as mechanical rooms, electrical rooms, elevator machine rooms, storage warehouses, and general building relief.

Low-cost direct-drive axial exhaust fans (RMD-10 to RMD-18) featuring spun aluminum weather cowls, die-formed blades, pre-wired disconnect switches, and versatile roof curb or wall mounting for commercial utility ventilation across Saudi Arabia.

Request Quote on WhatsApp Call Technical Sales Download RMD Datasheet PDF

In brief

What is the RMD direct-drive axial fan?

The RMD series is an economical direct-drive axial ventilator designed for roof or exterior wall mounting in applications with little or no ductwork. It delivers 500 to 2,400 CFM at low static pressure, making it the ideal low-cost choice for mechanical rooms, electrical substations, elevator shafts, and storage warehouse air relief.

RMD direct drive axial roof and wall exhaust fan with spun aluminum weather cowl and integral base

RMD Direct Drive Axial Roof Fan

Full static pressure matrix (0"–0.875" SP)

Direct-drive roof & wall exhaust (500–2,400 CFM)

Saudi Arabia project supply

RMD Direct Drive Axial Roof Fan

Fan Category

Direct Drive Axial Roof & Wall Fan

Product Series

RMD Series (RMD-10 to RMD-18)

Airflow Span

500 to 2,400 CFM (free air at 60Hz)

Max Static Pressure

Up to 0.875 in. wg (218 Pa) on RMD-18

Operating Limit

110°F (43.3°C) max airstream temperature

Mounting Flexibility

Rooftop Curb & Through-Wall Mounting

Application Check

Is the RMD axial fan suitable for your ventilation project?

Evaluate system static pressure resistance, mounting location (roof vs. wall), electrical supply, and ambient temperature limits.

Good fit

Commercial building mechanical room, electrical substation, and elevator machine room exhaust
Warehouse, factory, and workshop general ventilation with little or no ductwork
Back-of-house utility areas, storage rooms, and trash chutes requiring low-cost air relief
Through-the-wall horizontal exhaust using wall brackets and gravity backdraft dampers

Confirm first

System static pressure: verify duct resistance does not exceed model capability (drops sharply above 0.375" SP)
Roof or wall opening dimensions: obtain factory certified submittal drawings before framing
Electrical supply: standard Saudi 220–240V 1-Phase 60Hz (FLA 1.1A to 4.5A)
Accessory scope: specify if optional roof curb, gravity damper, or wall brackets are required

Use another documented fan

Commercial kitchen cooking grease hoods (select UL 762 compliant Upblast Roof Fan)
High-resistance duct runs or multi-story ducted risers (select RC-A Centrifugal Roof Fan)
Emergency fire smoke extraction (select Civil Defence approved VDO Smoke Fan)
Flammable, explosive, or ATEX hazardous environments (select certified Explosion-Proof Fan)

Engineering & temperature boundaries: CRITICAL CONSTRUCTION & TEMPERATURE NOTICE: Dimensions in this catalogue are for preliminary layout only — DO NOT USE FOR CONSTRUCTION. Consult Cloud Electricals for certified factory submittal prints prior to cutting roof curbs, wall openings, or duct connections. Furthermore, RMD fans carry a strict maximum operating temperature of 110°F (43.3°C) and must NEVER be used for commercial kitchen grease exhaust or fire smoke systems.

Airflow Performance Matrix

RMD Full Documented Static Pressure Matrix (CFM vs. SP)

Complete documented performance matrix from 0 in. SP (free air) to 0.875 in. SP (218 Pa) extracted directly from the official manufacturer datasheet.

Swipe horizontally to view all static pressure columns.

Model	Impeller Dia.	Speed (RPM)	Motor HP	FLA (A)	0" SP (0 Pa)	0.125" SP (31 Pa)	0.25" SP (62 Pa)	0.375" SP (93 Pa)	0.50" SP (125 Pa)	0.625" SP (156 Pa)	0.75" SP (187 Pa)	0.875" SP (218 Pa)
RMD-10	10" (254 mm)	1500	1/30 HP	1.1 A	500 CFM	339 CFM	267 CFM	173 CFM	Not rated	Not rated	Not rated	Not rated
RMD-12	12" (305 mm)	1500	1/10 HP	1.2 A	830 CFM	710 CFM	620 CFM	522 CFM	436 CFM	357 CFM	270 CFM	Not rated
RMD-14	14" (356 mm)	1100	1/6 HP	2.2 A	1,160 CFM	899 CFM	786 CFM	646 CFM	521 CFM	384 CFM	236 CFM	Not rated
RMD-18	18" (457 mm)	1100	1/3 HP	4.5 A	2,400 CFM	2,034 CFM	1,628 CFM	1,491 CFM	1,293 CFM	1,084 CFM	881 CFM	662 CFM

Selection Basis: Airflow values (CFM) are catalog test points at 60Hz. Direct-drive axial fans operate with little to no duct resistance; as system static pressure rises, airflow decreases. Cells marked "Not rated" indicate static pressure points beyond the recommended operating envelope of that model.

Dimensions & Opening Schedule

RMD Architectural Dimensions & Opening Schedule

Dimensions in inches and millimeters for roof curb rough-in, wall penetrations, and damper square sizing.

Critical Construction Notice: DO NOT USE CATALOG DIMENSIONS FOR SITE CONSTRUCTION. Always consult Cloud Electricals for certified factory submittal prints prior to cutting roof curbs, exterior wall openings, or duct transitions.

Swipe horizontally to view all dimensional values.

Model	Impeller Dia.	HT (Flange)	B (Overall Base)	C (Inside Curb)	D (Housing Height)	E (Hood Width)	Roof Opening (RO)	Damper Square	Weight (lbs / kg)
RMD-10	10" (254 mm)	2" (51 mm)	19" (483 mm)	17.5" (445 mm)	12" (305 mm)	13" (330 mm)	13" x 13" (330 mm)	12" x 12" (305 mm)	24 lbs (10.9 kg)
RMD-12	12" (305 mm)	2" (51 mm)	19" (483 mm)	17.5" (445 mm)	12" (305 mm)	13" (330 mm)	13" x 13" (330 mm)	12" x 12" (305 mm)	32 lbs (14.5 kg)
RMD-14	14" (356 mm)	2" (51 mm)	21" (533 mm)	19.5" (495 mm)	12" (305 mm)	16" (406 mm)	16" x 16" (406 mm)	15" x 15" (381 mm)	45 lbs (20.4 kg)
RMD-18	18" (457 mm)	2" (51 mm)	26" (660 mm)	24.5" (622 mm)	12" (305 mm)	20" (508 mm)	20" x 20" (508 mm)	19" x 19" (483 mm)	67 lbs (30.4 kg)

1. Roof Curb Mounting

Mounts over optional 20-gauge steel prefabricated curb with 3-inch flashing flange (outer curb width 18.3 to 27.3 inches).

2. Wall Mount Brackets

Utilize optional heavy-duty wall mounting brackets and a gravity damper for direct through-the-wall horizontal exhaust.

3. Roof Opening Penetration

Square rough-in opening requires: 13 x 13 inches (RMD-10/12), 16 x 16 inches (RMD-14), or 20 x 20 inches (RMD-18).

4. Disconnect Switch

Factory-fitted local disconnect switch with protected internal wiring conduit enables fast, code-compliant connection.

Engineering Architecture

Direct-Drive Axial Simplicity & Weather Protection

Engineered for high reliability, zero belt maintenance, and versatile roof or exterior wall installation.

Spun Aluminum Weatherproof Cowl

Seamless heavy-gauge spun aluminum outer housing provides 360-degree weather shielding and excellent corrosion resistance in harsh outdoor desert conditions.

Die-Formed Axial Impeller & Hub

Aerodynamically shaped axial blades securely riveted to a heavy-duty steel hub deliver balanced, low-noise air movement at 1,100 to 1,500 RPM.

Totally Enclosed Ball Bearing Motor

Equipped with a permanently lubricated, totally enclosed motor with thermal protection, rated for continuous ambient duty up to 110°F (43.3°C).

Pre-Wired Conduit & Disconnect Switch

Integrated wire conduit provides a protected internal wiring channel connecting directly to the standard built-in local disconnect switch.

Key Features

RMD Axial Exhaust Fan Engineering Highlights

Low-cost direct-drive design with robust spun aluminum weather protection for commercial buildings.

Low-cost direct-drive axial ventilation solution for little or no ductwork applications

Dual-mounting capability for rooftop curb upstand or through-the-wall installation

Corrosion-resistant heavy-gauge spun aluminum housing engineered for harsh outdoor environments

Die-formed axial fan blades securely riveted to a rigid steel drive hub

Totally enclosed, permanently lubricated ball bearing motor for reliable continuous operation

Factory standard bird and debris protective screen included in base package

Integrated electrical wire conduit and factory-fitted local disconnect switch included

Verified 60Hz single-phase electrical supply (220–240V / 60Hz standard; 115V optional)

Specifications

Category Technical Specifications

Comprehensive engineering specifications for RMD direct-drive axial roof and wall exhaust fans.

Swipe horizontally to compare all columns.

Specification	Engineering Details
Product Category	Roof Fan
Product Type	Direct Drive Axial Roof & Wall Exhaust Fan
Model Series	RMD-10, RMD-12, RMD-14, RMD-18
Installation Mounting	Rooftop curb mounting or through-the-wall mounting
Airflow Range (0" SP)	500 to 2,400 CFM free-air catalog range
Static Pressure Span	Tested from 0" to 0.875" in. wg (0 to 218 Pa) depending on model
Impeller Diameters	10" (254 mm), 12" (305 mm), 14" (356 mm), 18" (457 mm)
Motor Type	Totally enclosed, permanently lubricated, ball bearing motor
Electrical Supply	220–240V / 60Hz 1-Phase (Saudi Standard) or 115V / 60Hz 1-Phase
Full Load Amps (FLA)	1.1 A (RMD-10), 1.2 A (RMD-12), 2.2 A (RMD-14), 4.5 A (RMD-18)
Maximum Temperature	110°F (43.3°C) maximum airstream operating temperature
Housing Material	Heavy-gauge spun aluminum weather cover and mounting flange
Standard Inclusions	Bird screen, local disconnect switch, internal wire conduit
Documentation	Datasheet PDF, technical submittal, CR, VAT, and COC on request

Inclusions & Options

Standard Inclusions vs. Optional Accessories

Clear distinction between factory-included standard equipment and optional project mounting accessories.

Standard Inclusions (Base Package)

Included with every RMD fan unit from the factory

Spun Aluminum Weather Housing & Base Flange
Die-Formed Axial Impeller Riveted to Steel Hub
Totally Enclosed Ball Bearing Motor
Heavy-Duty Galvanized Bird Screen
Factory-Fitted Local Electrical Disconnect Switch
Internal Protected Wiring Conduit Channel

Optional Accessories (Project Coordinated)

Specify during quotation review according to site mounting requirements

Prefabricated 20-Gauge Steel Roof Curb (3" Flange)
Automatic Gravity Backdraft Damper
Motorized Actuated Backdraft Damper
Heavy-Duty Wall Mounting Brackets (for Wall Exhaust)
Variable Electronic Speed Controller
Vibration Isolation Gasket Tape

Applications

Where RMD Direct Drive Axial Fans Are Installed

Low-cost roof or through-the-wall exhaust across commercial buildings, mechanical plant rooms, and un-ducted industrial spaces.

Mechanical room exhaust

Removes: Heat buildup, compressor ambient heat, and stale air in utility rooms

Warehouse ventilation

Removes: Solar heat accumulation and stagnant air with low-resistance roof relief

Commercial utility spaces

Removes: Stale air, humidity, and heat from electrical and elevator machine rooms

Industrial factories

Removes: General ambient air in un-ducted manufacturing bays

Through-the-wall exhaust

Removes: Wall-mounted air extraction using wall brackets and gravity dampers

Workshops & storage

Removes: Stale air and light fumes without requiring extensive duct systems

Building retrofit openings

Removes: Compact direct replacement for obsolete rooftop or wall ventilators

MEP project supply

Removes: Supplied with exact RMD model, static pressure point, and certified prints

Airstream & ductwork boundary: RMD fans are engineered exclusively for low-resistance clean ambient air (≤ 110°F / 43.3°C). For commercial cooking grease hoods requiring UL 762 compliance, select an Upblast Roof Fan. For ducted medium/high-pressure ventilation, select an RC-A Centrifugal Roof Fan. For heavy industrial open warehouse relief, select a DWT Axial Roof Fan.

Selection support

What to Send for Correct RMD Selection

Provide mounting preference (roof vs. wall), required airflow (CFM) at static pressure, rough-in opening dimension, electrical voltage, and project city in Saudi Arabia.

Mounting preference: Rooftop curb mounting vs. Through-the-wall exhaust

Required exhaust airflow (CFM) at system static pressure (in. wg / Pa)

Roof or wall rough-in opening dimension (request certified submittal drawings)

Electrical supply: 220–240V 1-Phase 60Hz (Saudi standard) or 115V 1-Phase

Airstream temperature confirmation: clean ambient air <= 110°F (43.3°C)

Accessory requirements: roof curb, gravity damper, motorized damper, or wall brackets

Quantity of fans required per building zone

Project city and delivery schedule in Saudi Arabia

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

Certified factory print request prior to site penetration construction

Downloads

Documents & Procurement Files

Download the official RMD direct-drive axial fan datasheet PDF and request contractor certified submittal prints.

RMD Direct Drive Axial Roof Fan Datasheet PDFDownload PDF

RMD Factory Certified Submittal DrawingsRequest Certified Prints

Cloud Electricals Company ProfileRequest Profile

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

RMD Airflow & Static Pressure Matrix ScheduleRequest Performance Schedule

Related Commercial & Industrial Fans

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

Axial Roof Fan

Centrifugal Roof Fan

Downblast Roof Fan

Wall Mounted Fan with Damper

FAQ

RMD Axial Roof Fan Questions

Answers for HVAC consultants, MEP contractors, and building procurement engineers reviewing RMD direct-drive axial exhaust fans in Saudi Arabia.

The RMD series is designed as an economical, low-cost exhaust solution for commercial and industrial applications with little or no ductwork, such as mechanical rooms, electrical rooms, elevator machine rooms, storage warehouses, and general building relief.

Quotation Request

Request RMD Direct Drive Axial Fan Quotation

Send your required RMD model (RMD-10 to RMD-18), mounting preference (Roof vs. Wall), airflow target (CFM), static pressure, and project city in Saudi Arabia.

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