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FD

Product catalog summary

General Information
Ceiling swirl diffusers are designed for comfort zones, serving as supply or extract air diffusers. They are aesthetically pleasing and suitable for various ceiling systems, including freely suspended installations. These diffusers create high induction levels, reducing temperature differences and airflow velocity rapidly, and support both variable and constant volume flows for room heights up to 4 meters.

Specifications
Available in nominal sizes of 300, 400, 500, 600, and 625 mm, these diffusers handle volume flow rates from 9 to 235 l/s (31 to 846 m³/h). Constructed from galvanized sheet steel and powder-coated, they are suitable for both supply and extract air, with options for horizontal or vertical duct connections.

Function
The diffusers create a swirling airflow that induces high levels of room air, reducing airflow velocity and temperature differences. They handle large volume flow rates, providing mixed flow ventilation with minimal turbulence in occupied zones. The supply air to room air temperature difference can range from -12 to +10 K.

Technical Data
Quick sizing tables provide an overview of possible volume flow rates, sound power levels, and differential pressures. The diffusers are designed to maintain a sound power level of approximately 50 dB(A) at maximum volume flow rates.

Optional Equipment and Accessories
Options include exposed diffuser faces in RAL CLASSIC colors, square plenum boxes with cord-operated damper units, and pressure taps. Additional accessories like lip seals and damper blades for volume flow rate balancing are available.

Construction Features
The diffusers feature a central fixing screw with a decorative cap for easy installation. Plenum boxes are equipped with equalizing elements to ensure uniform airflow. Materials include galvanized sheet steel and ABS for spigots, with options for flame-retardant finishes.

Standards and Maintenance
The sound power level is measured according to EN ISO 5135, and the diffusers require low maintenance, adhering to VDI 6022 standards for inspection and cleaning.

Order Code and Variants
The order code specifies the type, construction style, system, connection, damper blade, accessories, nominal size, and exposed surface color. Variants include square and circular diffuser faces with options for horizontal and vertical duct connections.

Overview
This document provides technical specifications and installation guidelines for ceiling swirl diffusers, specifically the FD-R and FD-Q models, designed for both horizontal and vertical duct connections. It includes details on construction features, nominal sizes, installation procedures, and volume flow rate balancing.

Specifications

FD-R-*-H and FD-R-*-V Variants: These models feature a circular diffuser face with a plenum box for horizontal or vertical duct connections. Nominal sizes range from 300 to 625 mm. Key construction features include a spigot suitable for circular ducts to EN 1506 or EN 13180, and an optional lip seal.
FD-Q-*-H and FD-Q-*-V Variants: These models have a square diffuser face with a plenum box for horizontal or vertical duct connections. They also come in nominal sizes from 300 to 625 mm.

Installation Procedures

Installation can be done in T-bar ceilings, continuous ceilings, or metal ceilings. The diffuser face is fixed using a central screw and decorative cap.
For flush ceiling installations, suspension with cords, wires, or hangers is required, which are to be provided by others.

Volume Flow Rate Balancing

Diffusers with a universal plenum box and damper blade allow for volume flow rate balancing. The damper blade can be adjusted between 0 and 90 degrees.
Volume flow rate measurement can be conducted using a digital manometer connected to the measuring tube and pressure tap.

Key Parameters

Nominal Sizes (NS): 300, 400, 500, 600, 625 mm
Effective Air Discharge Area (Aeff): Varies by model and size
Sound Power Level (LWA): Based on 1 pW
Volume Flow Rate (qv): Measured in m³/h or l/s

Additional Notes

All dimensions are provided in millimeters unless stated otherwise.
Sound power levels are based on a reference of 1 pW.

Catalog excerpts

Product data sheet Ceiling diffusers FD Circular diffuser faces with circular plenum box Square diffuser face with square plenum box For comfort zones, with fixed air control blades Circular diffuser face with circular plenum box and top entry spigot Horizontal swirling air discharge Circular and square ceiling swirl diffusers that create high induction levels, for high room air change rates ■ Nominal sizes 300, 400, 500, 600, 625 ■ Volume flow rate range 9 – 235 l/s or 31 – 846 m³/h ■ Diffuser face made of galvanised sheet steel, powder-coated ■ For supply and extract air ■ For variable and constant volume flows ■ For all types of ceiling systems, and with an extended border also suitable for freely suspended installation ■ High induction results in a rapid reduction of the temperature difference and airflow velocity ■ Very high room air change rate possible thanks to row arrangement with a minimum pitch distance of 0.9 m ■ Ideal for comfort zones ■ Circular diffuser faces can be easily mounted without tools in a circular plenum box with horizontal spigot Optional equipment and accessories ■ Exposed diffuser face available in RAL CLASSIC colours ■ Square plenum box with cord-operated damper unit and pre

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Product data sheet General information Function Technical data Quick sizing Specification text Order code Variants Dimensions Product details Nomenclature General information Application ▪ Ceiling swirl diffusers are used as supply air or extract air diffusers for comfort zones ▪ Attractive design element for building owners and architects with demanding aesthetic requirements ▪ Horizontal swirling supply air discharge for mixed flow ventilation ▪ The efficient swirl creates high induction levels, thereby rapidly reducing the temperature difference and airflow velocity (supply air variant) ▪...

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Product data sheet Function Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling swirl diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone. Type FD ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply...

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Product data sheet Schematic illustration of FD with circular plenum box and side entry spigot ① Diffuser face ② Central fixing screw with decorative cap ③ Plenum box ④ Cross bar ⑤ Equalising element (Z: for supply air) ⑥ Suspension bracket ⑦ Spigot Optional ⑧ Double lip seal ⑨ Damper blade for volume flow

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Product data sheet Horizontal omni directional flow

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Product data sheet Technical data Nominal sizes Minimum volume flow rate, with Δtz = -6 K Maximum volume flow rate, with LWA ≅ 50 dB(A) Supply air to room air temperature difference Quick sizing The quick sizing table gives a good overview of the possible volume flow rates and the corresponding sound power levels and differential pressures. The minimum volume flow rates apply to a supply air to room air temperature difference of –6 K. The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°. Exact values for all parameters can be determined...

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Product data sheet FD-*-Z-V (supply air), sound power level and total differential pressure NS

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Product data sheet Specification text This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design program. Specification text Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones, for a maximum air change rate of 35 per hour. Diffuser face with individually manually adjustable air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings. Ready-to-install component...

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Product data sheet Order code FD – Q – Z – H – M – L / 500 / P1 - RAL … | | | | | | | | 1 2 3 4 5 6 7 8 1 Type FD Swirl diffuser 2 Construction style R Circular Q Square 3 System Z Supply air A extract air 4 Connection H horizontal V vertical (the plenum box is always circular) 5 Damper blade for volume flow rate balancing No entry: without damper blade M with damper blade MN with cords and pressure tap (only with square plenum box) 6 Accessories No entry: without accessories L with lip seal 7 Nominal size [mm] 300, 400, 500, 600, 625 8 Exposed surface No entry: powder-coated RAL 9010, pure white...

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Product data sheet FD-Q-*-H Variants ▪ Ceiling swirl diffuser with square diffuser face ▪ With square plenum box for horizontal duct connection Nominal sizes ▪ 300, 400, 500, 600, 625 mm Construction ▪ Square diffuser face ▪ Plenum box for horizontal duct connection ▪ Square opening to accommodate the diffuser face ▪ Equalising element that ensures a uniform airflow through the diffuser face (supply air variant) ▪ Simple installation of the diffuser face due to central fixing screw with decorative cap ▪ Damper blade for volume flow rate balancing (optional) ▪ Pressure tap and cord-operated damper...

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Product data sheet ▪ Damper blade for volume flow rate balancing (optional) ▪ Lip seal (optional) Construction features ▪ Spigot suitable for circular ducts to EN 1506 or EN 13180 ▪ Spigot with groove for lip seal (if accessory lip seal has been ordered) -------------------------------------------------------------------------------------------------------- FD-R-*-H Variants ▪ Ceiling swirl diffuser with circular diffuser face ▪ With circular plenum box for horizontal duct connection Nominal sizes ▪ 300, 400, 500, 600, 625 mm Construction ▪ Plenum box for horizontal duct connection ▪ Circular...

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Product data sheet Construction ▪ Circular diffuser face ▪ Plenum box for vertical duct connection ▪ Circular opening to accommodate the diffuser face ▪ Equalising element that ensures a uniform airflow through the diffuser face (supply air variant) ▪ Simple installation of the diffuser face due to central fixing screw with decorative cap ▪ Damper blade for volume flow rate balancing (optional) ▪ Lip seal (optional) Construction features ▪ Spigot suitable for circular ducts to EN 1506 or EN 13180 ▪ Spigot with groove for lip seal (if accessory lip seal has been ordered) --------------------------------------------------------------------------------------------------------...

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FD

FD

Catalog excerpts

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