RMUA Roof / Wall Fresh Air Supply Fan
Direct-drive axial supply fans with spun aluminum weather cowls, heavy-gauge mounting frames, and built-in disconnect switches for commercial fresh-air supply and makeup ventilation in Saudi Arabia.
The RMUA series is a direct-drive axial roof or exterior wall-mounted supply fan manufactured by United Electrical Supplies Factory Co., specifically configured for commercial fresh-air supply and makeup ventilation in mechanical rooms, electrical substations, warehouses, and commercial buildings. Available in two models—RMUA-14 (14", 1,160 CFM free-air, 1/6 HP) and RMUA-18 (18", 2,400 CFM free-air, 1/3 HP)—each unit features a spun aluminum cowl, internal wire bird screen, totally enclosed ball-bearing motor (220–240V 60Hz single phase), and factory-mounted disconnect switch. Free-air CFM represents zero resistance; actual delivered airflow must be selected against total design external static pressure (duct, damper, louver, and filter losses). Need kitchen grease hood makeup air with filtration? Explore the SDZ Kitchen Makeup Unit.
Product Duty & Airflow Direction Verification Notice
SUPPLIED / CONFIGURED FOR: Commercial fresh-air supply & makeup air ventilation (factory configured downward supply discharge; can also be project-specified for general roof/wall exhaust). Final airflow direction and mounting orientation must match the approved project selection and manufacturer instructions. Unlike specialized kitchen makeup units, RMUA is designed for general clean-air building ventilation without integral heating or kitchen grease filtration.
RMUA Airflow Performance Across Static Pressure Points
Official airflow performance (CFM and m³/h) extracted from United Electrical Supplies Factory Co. catalogue (p. 3). Free-air capacity (0" SP) represents zero duct resistance; commercial project selections must verify airflow under design external static pressure (duct runs, louvers, dampers, and filters).
Swipe horizontally to view performance across all static pressure points from 0" to 0.875" SP.
| Model | RPM | Motor HP | FLA (220V) | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RMUA-14 | 1100 | 1/6 HP | 2.2 A | 1,160 CFM (1,971 m³/h) | 899 CFM (1,527 m³/h) | 786 CFM (1,335 m³/h) | 646 CFM (1,098 m³/h) | 521 CFM (885 m³/h) | 384 CFM (652 m³/h) | 236 CFM (401 m³/h) | — (Cut-off) |
| RMUA-18 | 1100 | 1/3 HP | 4.5 A | 2,400 CFM (4,078 m³/h) | 2,034 CFM (3,456 m³/h) | 1,628 CFM (2,766 m³/h) | 1,491 CFM (2,533 m³/h) | 1,293 CFM (2,197 m³/h) | 1,084 CFM (1,842 m³/h) | 881 CFM (1,497 m³/h) | 662 CFM (1,125 m³/h) |
RMUA Dimensions, Base Flange & Damper Sizes
Exact engineering dimensions in inches and millimeters extracted from United Electrical Supplies drawings. Check base flange and damper square dimensions against your project roof curb or wall opening.
Swipe horizontally to view all model dimensions and weight.
| Model | Fan Diameter | Unit Height (HT) | Cowl Outer Ø (W) | Base Flange (B) | Curb Skirt (D) | Roof Opening (RO) | Damper Square | Unit Weight (WT) |
|---|---|---|---|---|---|---|---|---|
| RMUA-14 | 14" (355 mm) | 12.6" (320 mm) | 27.3" (694 mm) | 21.0" (533 mm) | 2.0" (50.8 mm) | 16.0" (406 mm) | 15.0" (381 mm) | 45 lbs (20.4 kg) |
| RMUA-18 | 18" (457 mm) | 14.4" (366 mm) | 33.6" (854 mm) | 26.0" (660 mm) | 2.0" (50.8 mm) | 20.0" (508 mm) | 19.0" (483 mm) | 67 lbs (30.4 kg) |
Roof & Wall Fresh Air Supply Engineering
The RMUA series by United Electrical Supplies Factory Co. provides dependable outdoor air introduction for commercial facilities requiring positive pressure balance or fresh replacement air. Configured with a downward-discharging axial impeller and a protective spun aluminum hood, RMUA fans prevent outdoor water infiltration while continuously supplying fresh air to mechanical rooms, generator rooms, electrical substations, and commercial storage facilities.
Mounting versatility allows RMUA units to be mounted horizontally over a prefabricated roof curb or mounted vertically against an exterior building wall using structural wall brackets. Each unit incorporates a heavy-gauge internal wire bird screen to bar wildlife, a weather-sealed electrical conduit channel, and a factory-fitted disconnect switch for safe local isolation during maintenance.
For commercial facilities requiring dedicated kitchen grease exhaust replacement air with grease pre-filtration, review our Kitchen Makeup Air Unit (SDZ-MUA). If your project requires rooftop air extraction rather than fresh air supply, explore the companion RMD Direct Drive Axial Roof Exhaust Fan or our comprehensive Fresh Air & Makeup Fan Category.
RMUA Series Engineering Highlights
Standard construction, weather protection, and electrical design features.
RMUA Technical Specifications
Engineering baseline parameters for RMUA-14 and RMUA-18 supply fans.
Swipe horizontally to view all specifications.
| Specification | Engineering Details |
|---|---|
| Product Category | Fresh Air Fan / Roof & Wall Supply Fan |
| Product Series | RMUA Series (United Electrical Supplies Factory Co.) |
| Available Models | RMUA-14 (14") and RMUA-18 (18") |
| Primary Application | Commercial fresh-air supply, makeup ventilation, warehouse & mechanical room air renewal |
| Housing Material | Heavy-gauge spun aluminum weather cowl with galvanized steel base curb frame |
| Impeller Construction | Axial impeller with die-formed aluminum/steel blades riveted to steel hub |
| Airflow Capacity Range | 1,160 to 2,400 CFM free-air (1,971 to 4,078 m³/h) |
| Static Pressure Capability | Tested across 0" to 0.875" SP (0 to 218 Pa) |
| Motor Construction | Totally enclosed (TEFC), permanently lubricated ball bearing motor, 1100 RPM nominal |
| Electrical Supply (KSA) | 1~220–240V / 60Hz single-phase standard (110–120V / 60Hz catalog option) |
| Full Load Amperes (FLA) | 2.2 A (RMUA-14) / 4.5 A (RMUA-18) at 220V single phase |
| Accessories Available | Prefabricated roof curbs, gravity backdraft dampers, motorized dampers, wall mounting brackets |
Mounting Hardware & Airflow Dampers
Optional installation components, backdraft shutters, and electrical isolation options.
Where RMUA Supply Fans Are Deployed
Fresh-air introduction and positive-pressure ventilation across commercial and industrial facilities.
What to Send for RMUA Fan Selection
Provide your required operating airflow (CFM at external static pressure), mounting orientation (roof curb vs. exterior wall), damper requirements, and project delivery city in Saudi Arabia.
Documents & Submittal Files
Download the official United Electrical Supplies Factory Co. RMUA catalogue (PDF, 1.1 MB, 3 pages) and request engineering submittal packages.
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View DetailsRMUA Supply Fan Questions
Authoritative technical answers regarding airflow duty, mounting, electrical voltages, and submittals.