💨 Zepher 1.75kW Commercial Air Blower (Three Phase) – RT-4019

Robust, Reliable Performance for Demanding Commercial Spa & Hydrotherapy Installations

📋 Product Overview

The Zepher 1.75kW Commercial Air Blower is a premium three-phase side channel blower engineered for demanding commercial applications where reliability and continuous operation are essential. Manufactured in the UK by Zepher, this unit delivers consistent, powerful airflow for hot tubs, hydrotherapy systems, and commercial wellness facilities.

Built with Class H motors and housed in a robust construction rated IP55 for dust and water ingress protection, this blower operates at 72 dB – a reasonable noise level for commercial plant room installations. The three-phase motor design ensures smooth, efficient operation with reduced vibration and extended service life compared to single-phase alternatives.

Ideal for spa installers, commercial wellness centres, and aquatic facility managers seeking a dependable, industrial-grade air blower backed by ISO 9001 certified manufacturing and full European compliance certifications.

⭐ Key Features

✅ 1.75kW Power Output – Delivers robust, sustained airflow for larger commercial spa installations and multi-jet hydrotherapy systems

✅ Three-Phase Motor Operation – Provides smoother running, reduced vibration, and enhanced durability for continuous commercial use

✅ 72 dB Noise Level – Suitable for plant room installations; position away from relaxation areas for optimal guest experience

✅ IP55 Protection Rating – Fully protected against dust ingress and water jets from any direction, suitable for wet plant room environments

✅ Class H Motor Insulation – Premium motor winding insulation rated for high-temperature operation, extending motor lifespan

✅ ISO 9001 Certified Manufacturing – Built to internationally recognised quality standards in the UK

✅ Integrated Relief Valves – Supplied with 1 x RV01-VZ vacuum relief valve and 1 x RV01-PZ pressure relief valve for safe operation

✅ MF12 Intake Filter – 100 micron filtration efficiency protects the blower from debris and extends service intervals

✅ Full European CE Compliance – Meets Machinery Directive 89/392/EEC, Low Voltage Directive 73/23/EEC, and EMC Directive 89/336/EEC requirements

🔧 Technical Specifications

Specification	Details
Model Number	RT-4019
Curve Number	53F
Power Output	1.75 kW
Power Supply	Three Phase AC, 50Hz
Voltage	220-240V / 380-415V
Current Draw	7.8Δ / 4.5Y Amps
Noise Level	72 dB
Protection Rating	IP55
Motor Class	Class H Insulation
Weight	26 kg (approx.)
Dimensions (L x W x H)	400mm x 400mm x 400mm
Intake Filter	MF12 (100 micron efficiency)
Vacuum Relief Valve	1 x RV01-VZ (supplied loose)
Pressure Relief Valve	1 x RV01-PZ (supplied loose)
Certifications	CE, ISO 9001
EU Directives	89/336/EEC (EMC), 89/392/EEC (Machinery), 91/368/EEC, 71/23/EEC (Low Voltage), 93/44/EEC, 93/68/EEC
Standards	EN292-1, EN292-2, prEN563, prEN1012-1, prEN1012-2, EN60204-1, EN294, EN349, EN50081-2, EN50082-2
ISO Standards	ISO3266, ISO3529, ISO3744
Voltage Tolerance	±10% (DIN IEC 38) / ±5% (DIN VDE 0530)
Origin	Zepher UK Ltd, Congleton, Cheshire CW12 4XJ

🎯 Real World Examples & Applications

🏨 Commercial Spa & Hotel Installations

The 1.75kW output makes this blower ideal for hotel spa facilities, health clubs, and day spas where multiple guests use hydrotherapy features throughout the day. The three-phase motor handles extended duty cycles without overheating, and at 72 dB, the unit is best positioned in a dedicated plant room away from relaxation areas. Expect continuous, reliable bubble massage delivery across multiple outlets.

💆 Hydrotherapy & Rehabilitation Centres

Medical and rehabilitation facilities benefit from the consistent airflow delivery essential for therapeutic air massage treatments. The IP55 rating ensures safe operation in clinical wet environments, and the robust construction withstands the demands of daily professional use.

🏊‍♂️ Swimming Pool Features

Perfect for powering bubble benches, lazy river air injection systems, and splash zone features in commercial swimming pools. The side channel design delivers steady, non-pulsating airflow that creates gentle, even bubble distribution.

🛁 High-End Residential Spas

Homeowners seeking commercial-grade performance for premium residential hot tub installations will benefit from the reliable power delivery. At 72 dB, consider installing in a well-insulated plant housing or equipment enclosure to minimise noise transmission to outdoor living areas.

🔄 Blower Replacement & Upgrades

An excellent choice for replacing worn, noisy, or inefficient older blowers in existing commercial installations. The standard connection options and compact dimensions simplify retrofit projects.

🛠️ Installation Considerations

⚠️ Professional Installation Required – This unit must be installed by a qualified electrician familiar with three-phase commercial equipment.

Electrical Requirements:

• Three-phase power supply (50Hz)
• Voltage: 220-240V (delta) or 380-415V (star configuration)
• Current draw: 7.8A (delta) / 4.5A (star)
• Dedicated circuit with appropriate circuit protection

Mounting & Positioning:

• Install in a well-ventilated plant room or enclosure
• Ensure adequate clearance around the unit for airflow and maintenance access
• Can be mounted horizontally or vertically depending on installation requirements
• Protect from direct weather exposure despite IP55 rating for maximum longevity

Ventilation Requirements:

• Adequate ambient air circulation essential to prevent motor overheating
• Do not install in confined, unventilated spaces
• Allow minimum clearance as per manufacturer guidelines

Connection Notes:

• Relief valves supplied loose – adapter/connection options available from Zepher UK
• MF12 intake filter supplied without connection pipework – contact Zepher UK for options

📥 Downloads & Resources

📄 Zepher RT Range Brochure (50Hz) – Download PDF

Contains complete technical data, performance curves, and specifications for the full RT Range of side channel vacuum pumps and air blowers.

🏆 Why Choose This Air Blower

✅ British Engineering Excellence – Designed and manufactured in the UK by Zepher, a specialist in side channel blower technology

✅ Commercial-Grade Durability – Built for continuous operation in demanding professional environments with Class H motor insulation

✅ Suitable for Plant Room Installation – At 72 dB, designed for dedicated equipment rooms in commercial facilities

✅ Full IP55 Protection – Confidently install in wet plant rooms knowing the unit is protected against water and dust ingress

✅ ISO 9001 Quality Assurance – Every unit manufactured to internationally certified quality management standards

✅ Complete European Compliance – CE marked and compliant with Machinery, EMC, and Low Voltage Directives for peace of mind

🤝 Why Buy From Parts4Tubs?

✅ UK-based specialist supplier with expert knowledge of spa and hot tub equipment

✅ Technical advice available to help you select the right blower for your application

✅ Fast UK delivery to minimise installation delays

✅ Competitive pricing on genuine Zepher equipment

✅ Dedicated customer support before, during, and after your purchase

✅ Secure online ordering with easy returns policy

✅ Genuine manufacturer parts and equipment

✨ Summary

The Zepher 1.75kW Commercial Air Blower (RT-4019) delivers the powerful, reliable performance commercial spa installations demand. With IP55 protection, Class H motor insulation, and ISO 9001 certified UK manufacturing, this three-phase blower is built to last in the most demanding environments. At 72 dB, it’s ideally suited for dedicated plant room installations in hotels, wellness centres, hydrotherapy facilities, and commercial aquatic venues. Order today for fast UK delivery from Parts4Tubs.