Round Ceiling Diffuser

REF-RCD

- Material aluminum
- Powder coated, Anodized available
- Full range of sizes
- Removable core
- Adjustable blades
- Optional Butterfly Damper, Installation Beam & Bolt

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Refria Round Ceiling Diffuser

High-performance circular air distribution solution with uniform radial discharge for modern HVAC systems

About Refria Round Ceiling Diffusers

The Refria series round ceiling diffuser offers uniform radial air discharge in a sleek, circular design. This round diffuser is engineered for optimal air mixing and comfort, suitable for both supply and return air applications in commercial, industrial, and residential spaces. The circular design ensures even air distribution without drafts.

Ø150 - Ø500

Diameter Range (mm)

Up to 3.6m

Max Throw Distance (H Design)

Radial

Air Discharge Pattern

Selection & Performance Data (REF-RCD-D Series)

Comprehensive performance data for selecting the right round ceiling diffuser for your project.

REF-RCD-D Series Basic Data

Size (mm)	Ø D (mm)	Ø A (mm)	Air Volume (m³/h)	Throw Max. (m)
150	145	300	148	0.9
200	195	400	260	1.5
250	245	450	395	1.8
300	295	500	560	2.3
350	345	550	750	2.8

Key Advantages of Our Round Ceiling Diffuser

Designed for uniform air distribution, efficiency, and seamless integration, our ceiling diffuser units provide superior performance with a clean, circular aesthetic.

Uniform radial discharge ensures even air distribution without drafts

Dual function for both supply and return air applications

Suitable for rooms with heights up to 4m (A,B,C designs), 6m (D design), 8m (H design)

Circular design integrates seamlessly with modern architectural styles

Optimized for low noise levels and high comfort

Easy screw-type installation with optional damper accessories

Materials & Accessories

Material

Constructed from high-quality aluminum sheet for durability and a lightweight, premium finish.

Available Accessories

Damper for precise airflow control (butterfly damper in plastic or steel manual control; radial-shape damper screw control).

Finishing

Standard white powder coating (RAL9016, RAL9010), custom colors available upon request, or anodized finishes for enhanced aesthetics and corrosion resistance.

Why Choose Refria Round Ceiling Diffusers?

Uniform Radial Air Distribution

The circular design of this round diffuser guarantees even, draft-free air distribution in all directions, enhancing occupant comfort.

Versatile Application

A single round ceiling diffuser model serves both supply and return air functions, simplifying system design and inventory.

High-Capacity Performance

Engineered for high air volume handling with optimized throw distances, suitable for various room sizes and ceiling heights.

Architecturally Clean Aesthetic

The sleek, circular profile of this ceiling diffuser blends discreetly into modern ceiling designs.

Durable & Low Maintenance

Made from robust aluminum with high-quality finishes, ensuring long-lasting performance with minimal upkeep.

Easy & Flexible Installation

Simple screw-type mounting and optional accessories make installing this round ceiling diffuser straightforward for HVAC professionals.

Important Notes

Performance data based on standard test conditions.
Specifications and dimensions are subject to change without prior notice.
For optimal performance, ensure proper selection and installation of the round ceiling diffuser by a qualified HVAC professional. Consult detailed performance tables for specific airflow, pressure drop, and noise level data.

Refria Round Ceiling Diffuser Support

Comprehensive warranty, technical specifications, and FAQs for your high-performance ceiling diffuser systems

24-Month Warranty for Round Ceiling Diffusers

Refria provides a 24-month warranty period for our round ceiling diffuser products, calculated from the date of installation or 30 months from the shipping date, whichever comes first. During this warranty period, we will provide free repair or replacement services for any failures caused by material or manufacturing defects in your ceiling diffuser system.

24

Months Warranty

✓

Free Replacement Parts

✓

Technical Support

Warranty Coverage Includes:

Material defects in aluminum construction of the round diffuser

Manufacturing defects in damper mechanisms and adjustment components

Powder coating defects and premature finish deterioration

Structural integrity issues affecting airflow performance

Technical Support for Ceiling Diffuser Systems

We offer dedicated technical support to assist with selection, installation, and troubleshooting of your Refria round ceiling diffuser systems. Contact us for performance data, installation guidance, or technical specifications.

✉️

Email Support

sharon.pan@refria.com

Contact us for technical questions, troubleshooting, or operational guidance specific to your round ceiling diffuser systems

⏱️

Response Time

Within 24 hours

(1 business day) for technical inquiries

Before Contacting Support

•

Your round diffuser model number (e.g., REF-RCD-D-300)

•

Size and specifications of your ceiling diffuser

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Application details (supply/return, air volume requirements)

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Photos of installation site or specific issues

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Your HVAC system specifications and ductwork details

Frequently Asked Questions about Round Ceiling Diffusers

What are the maximum air volume capacities for different sizes of round ceiling diffusers?

Refria round ceiling diffuser models offer varying capacities based on size and series:

150mm Round Diffuser

Up to 160 m³/h (REF-RCD-H Series)

300mm Round Diffuser

Up to 640 m³/h (REF-RCD-H Series)

350mm Round Diffuser

Up to 865 m³/h (REF-RCD-H Series)

Selection Tip:

Always consult the detailed performance tables for specific airflow, pressure drop, and noise level data when selecting your ceiling diffuser. Consider both air volume requirements and throw distance needs for optimal comfort.

What are the recommended mounting heights for round ceiling diffusers?

Refria round diffuser models are designed for different ceiling height applications:

Diffuser Series	Recommended Ceiling Height	Typical Applications
REF-RCD-A, B, C Series	Up to 4 meters	Commercial offices, retail spaces, residential rooms
REF-RCD-D Series	Up to 6 meters	Lobbies, conference rooms, hotel atriums
REF-RCD-H Series	Up to 8 meters	High-ceiling spaces, warehouses, auditoriums

Installation Note:

Proper selection based on ceiling height ensures optimal air distribution and comfort. Higher ceilings require diffusers with greater throw distances, available in our REF-RCD-H series of round ceiling diffusers.

Can round ceiling diffusers be used for both supply and return air applications?

Yes, Refria round ceiling diffusers are designed for dual functionality:

Supply Air Applications

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Uniform radial discharge pattern

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Adjustable airflow direction with optional dampers

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Optimized for mixing and draft-free comfort

Return Air Applications

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Efficient air collection from space

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Low pressure drop design

•

Compatible with filter installation

Design Advantage:

The versatility of using the same round diffuser model for both supply and return applications simplifies inventory management and creates a consistent aesthetic appearance throughout your space.

What maintenance is required for round ceiling diffusers?

Refria round ceiling diffusers require minimal maintenance, but regular checks ensure optimal performance:

Regular visual inspection for dust accumulation

Annual cleaning with mild detergent and soft cloth

Check damper operation and adjustment mechanisms

Verify mounting integrity and absence of air leaks

Inspect finish condition and touch up if necessary

Ensure no obstructions to airflow pattern

Cleaning Recommendation:

Use only mild, non-abrasive cleaners on the powder-coated or anodized surfaces of your ceiling diffuser. Avoid harsh chemicals that may damage the finish.

What accessories are available for round ceiling diffusers?

Refria offers several accessories to enhance the functionality of your round diffuser:

Accessory	Description	Application
Butterfly Damper	Manual airflow control damper in plastic or steel	Basic airflow adjustment and balancing
Radial-Shape Damper	Screw-controlled damper for precise adjustment	Fine-tuning of airflow distribution
Filter Holder	Frame for installing air filters in return applications	Return air filtration when used as air intake
Extension Collar	Adjustable depth extension for varying ceiling thickness	Installation in ceilings of different depths

Customization Options:

In addition to standard accessories, Refria round ceiling diffusers are available in custom powder coating colors (beyond standard RAL9016 and RAL9010) and anodized finishes to match specific architectural requirements.

How do I select the right size round ceiling diffuser for my application?

Selecting the correct size round ceiling diffuser involves considering several factors:

Key Selection Factors

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Required air volume (m³/h)

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Ceiling height and required throw distance

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Available static pressure and noise level requirements

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Room size and diffuser placement strategy

General Sizing Guidelines

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150-200mm: Small offices, residential rooms (up to 15m²)

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250-300mm: Medium spaces, conference rooms (15-30m²)

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350-500mm: Large areas, lobbies, open spaces (30m²+)

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Multiple diffusers often better than one oversized unit

Professional Assistance:

For complex applications, consult with our technical support team or a qualified HVAC professional. We provide detailed performance tables for all round ceiling diffuser models to ensure accurate selection based on your specific requirements.