FBK

FBK-1-*-KF-SV

FBK-1-*-KF-SM

With clamping flange and dirt trap, adjustable on the rear side

FBK-1-*-SM

With compensating ring and dirt trap, adjustable on the rear side

FBK-2-*-KF-SM

Black floor diffuser with clamping flange and dirt trap

FBK-2-*-SV

Black floor diffuser with dirt trap

FBK

Round plastic air diffusers for installation in the floor

Air diffuser for different installation situations and room air flows

Nominal sizes 150, 200 mm
Volume flow rate range 1 – 59 l/s or 4 – 213 m³/h
Circular diffuser face style
For constant and variable volume flows
For all types of raised floors
Horizontal or vertical airflow
Damper element can be adjusted on the front or rear side
Can be installed with or without clamping flange
The clamping flange allows quick and easy installation and removal of the grille core for cleaning purposes
Ideal for comfort zones

Optional equipment and accessories

Adjustable swirl unit for manual adjustment between vertical and horizontal air routing
Clamping flange with clamp spring attachment to cover the installation opening
Dirt trap can also be used as a damper element
Plenum box

Allgemeine Informationen

Application

Floor diffusers as supply air diffusers for comfort areas
Installation in raised floors without plenum box if it is constructed as a pressurised floor
Installation in raised floors with plenum box to allow individual ventilation in rooms or zones
Vertical supply airflow, with adjustable swirl unit and added horizontal air routing
Variants with adjustable swirl units can be manually set to vertical or horizontal air routing
Surface floor grille and clamping flange in 2 factory-available colours - for builders and architects with special demands on architecture and design
Comfortable and energy-efficient airflow through supporting convection currents in the occupied zone
Thermal loads are effectively dissipated
For constant and variable volume flows
For supply air temperature differences of -12 - +20 K

Special characteristics

Simple and quick assembly and covering of the installation opening when used with clamping flange and clamp spring attachment
Installation in hard flooring requires a compensating ring. The compensating ring is included in the delivery if no clamping flange has been selected
Grille inserts are twist-proof when combined with clamping flange
Quick and easy installation of floor diffusers with clamping flange and clamp spring attachment
With or without swirl unit to allow for various air patterns
Dirt trap adjustable at the front and rear, which can be used for volume flow balancing and reduces soiling of the raised floor

Nominal sizes

150, 200

Variants

Setting of the airflow direction

-*: no entry: vertical airflow, inalterable
-V: vertical swirling airflow, the swirl unit is manually adjustable
-H: horizontal swirling airflow, manually adjustable swirl unit

Installation

-*: Floor diffuser with compensating ring
-KF: Floor diffuser with clamping flange and clamp spring attachment

Dirt trap

-*: Floor diffuser with compensating ring
-SM: with adjustable dirt trap The adjustment which simultaneously serves as a damper element to balance the volume flow, is carried out at the rear of the diffuser
-SV: with adjustable dirt trap. The adjustment which simultaneously serves as a damper element to balance the volume flow, is carried out at the front of the diffuser

Plenum box

-*: no entry: without plenum box
-A: with plenum box for connection to the on-site air duct system

Construction

-1: Diffuser face similar to RAL 7037, dust grey
-2: Diffuser core similar to RAL 9005, black

Parts and characteristics

Diffuser core

Ring spacing 6 mm
Height-adjustable dirt trap serves as a damper element for volume flow rate balancing
Adjustable swirl unit for swirling airflow in vertical or horizontal flow direction

Clamping flange with clamp spring attachment

Anti-twist device for the grille insert
Covers the installation opening
Clamp spring attachment enables different magnitude of the raised floor and the compensation of large cut-out tolerances when creating the installation openings. For the tightest possible fit of the clamping flange, we recommend the minimum installation dimension
Levelling of soft flooring, e.g. carpet

Attachments

Clamping flange with clamp spring attachment
Adjustable swirl unit for vertical or horizontal swirling airflow
Fixed swirl unit for vertical airflow (only for nominal size 200)
Height-adjustable dirt trap which also serves as a damper element for volume flow rate balancing

Accessories

Plenum box -A:

For direct connection to the on-site air duct system
With incorporated air distribution element for a steady flow to the floor diffuser
Plenum box suitable for all nominal sizes

Material and surfaces

Grille core and clamping flange made of plastic Polyamide PA 6 UL94, V-0
Spring clips made of stainless steel
Adjustable swirl unit and dirt trap made of ABS plastic UL94, V-0
Compensating ring made of ABS plastic UL94, V-0
Dirt trap adjustment device and connective material made of galvanised steel
Plenum box made of galvanised sheet steel
Plastic surface, optionally in the colours dust grey (similar to RAL 7037) or deep black (similar to RAL 9005)

Technical data

Nominal sizes: 150, 200 mm
Volume flow rate range: 1 – 59 l/s or 4 – 213 m³ /h
Supply air temperature difference: -12 - +20 K
Crush resistance > 5 kN

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

Schematische Darstellung

A FBK-...-KF

B FBK

C FBK-...-KF-A

1 Frontdurchlass

2 Gehäuse mit Klemmflansch und Klemmfedern

3 Ausgleichsring

Optional

4 Schmutzfangkorb

5 Anschlusskasten

6 Bodenplatte (bauseitig)

Floor diffusers allow supply air in mechanical ventilation and air conditioning systems to flow into the room from below or from the floor. For adaptation to different local conditions, 3 different variants of the air routings are possible.

Vertical flow without adjustment option

Without adjustable swirl unit, the supply air flows vertically into the room at a moderate speed. Since cold air is heavier than warm air, the direction of flow reverses and the supply air flows back towards the floor. A low-turbulence or swell-like flow spreads over the entire floor surface. A lift current forms at heat sources such as people and equipment, so that the air is primarily exchanged in these areas.

This type of hybrid ventilation or mixed-source ventilation is designed exclusively for cooling operation. It is particularly suitable for rooms with a clear division between circulation and occupied areas. These include, for instance, cinema or theatre halls and waiting areas. The maximum supply air temperature difference should not exceed -6 K. The exhaust air should be dissipated in the upper part of the room, above the occupied zone.

Horizontal swirling airflow

An adjustable swirl unit set for vertical flow causes a swirling vertical supply air flow into the room. In doing so, the supply air induces room air near the floor surface and quickly reduces the air velocity as well as the temperature difference between supply air and room air. This type of mixed ventilation is particularly suitable for areas that are permanently intended for people to remain. This includes, for example, office spaces or assembly and
meeting rooms.

Vertical swirling airflow

An adjustable swirl blade set for vertical flow causes a swirling vertical supply air flow into the room. Through this process, the supply air induces room air. There is a rapid reduction in flow velocities and a quick reduction of the temperature difference between supply air and room air. This type of mixed ventilation results in proficient room ventilation. It is particularly suitable for areas in which people do not remain for longer periods of time. This includes corridors or similar circulation areas.

Nominal sizes	150, 200 mm
Volume flow rate range	1 – 59 l/s or 4 – 213 m³/h
Supply air to room air temperature difference	-12 to +20 K
Crush resistance	> 5 kN

The quick lay-out provides a proficient overview of the possible volume flow rates, the corresponding sound power levels and pressure differences with horizontal air flow. The minimum volume flow rates apply to a supply air temperature difference of -6 K. The maximum volume flows apply to a sound power level of approx. 50 dB(A) Exact values for all parameters can be determined with our Easy Product Finder design program.

Air diffuser only

NS	q_v		Δp_t	L_wA
NS	l/s	m³/h	Pa	dB(A)
150	1	4	0	< 15
	11	39	13	20
	21	77	49	39
	32	115	109	50
200	1	4	0	< 15
	20	72	11	17
	40	143	43	38
	59	213	95	50

With plenum box

NS	q_v		Δp_t	L_wA
NS	l/s	m³/h	Pa	dB(A)
150	1	4	0	< 15
	13	47	15	24
	26	93	57	40
	39	140	127	50
200	1	4	0	< 15
	19	67	14	19
	37	133	54	38
	55	198	119	50

With dirt trap

NS	q_v		H₄ = maximum		H₄ = 45		H₄ = 35
	q_v		Δp_t	L_wA	Δp_t	L_wA	Δp_t	L_wA
	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
150	1	4	0	< 15	0	< 15	0	< 15
	11	39	12	20	14	18	16	21
	22	78	48	39	54	39	61	41
	32	116	108	50	120	51	136	52

NS	q_v		H₄= maximum		H₄ = 50		H₄ = 40
	q_v		Δp_t	L_wA	Δp_t	L_wA	Δp_t	L_wA
	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
200	1	4	0	< 15	0	< 15	0	<15
	20	73	11	18	13	19	14	19
	40	143	42	38	49	39	56	40
	59	214	93	50	110	50	126	52

With plenum box and dirt trap

NS	q_v		H₄ = maximum		H₄ = 45		H₄ = 35
	q_v		Δp_t	L_wA	Δp_t	L_wA	Δp_t	L_wA
	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
150	1	4	0	< 15	0	< 15	0	< 15
	12	44	14	22	16	19	18	22
	24	86	54	40	60	40	69	42
	36	129	119	50	135	53	155	54

NS	q_v		H₄ = maximum		H₄ = 50		H₄ = 40
	q_v		Δp_t	L_wA	Δp_t	L_wA	Δp_t	L_wA
	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
200	1	4	0	< 15	0	< 15	0	< 15
	18	64	13	19	14	19	15	19
	35	125	49	38	54	39	60	39
	52	187	108	50	121	50	133	51

Specification text

General information:

Floor diffusers as supply air diffusers for installation in raised floors of all types. Supply air provision either directly via the raised floor if it is constructed as a pressurised floor, or via a plenum box connected to the on-site air duct system.

Grille core with twist-shaped connecting bars made of plastic polyamide PA 6 UL94, V-0, flame-retardant.

Installation:

With stepped compensating ring made of ABS plastic UL94, V-0, flame-retardant for precise installation in the raised floor
With clamping flange and clamp spring attachment for easy assemblage with various base plate magnitude from 10 mm. The component made of plastic polyamide PA 6 UL94, V-0 centres the grille core and simultaneously secures it against twisting

Airflow direction:

Without adjustable swirl unit for vertical airflow
With adjustable swirl unit made from ABS plastic UL94-V-0 for vertical or horizontal airflow. If required, the swirl unit can be adjusted manually

Dirt trap:

Without dirt trap and hence without damper element for volume flow rate balancing
With dirt trap made of ABS plastic UL94-V-0 which also serves as an adjustable damper element for volume flow rate balancing

Plenum box:

Without plenum box for installation in pressurised floor
With plenum box made of galvanised sheet steel; plenum box with Ø 123 mm spigot for connection to the air duct system With incorporated air distribution element for a steady flow to the floor diffuser

Equivalence criteria

2 nominal sizes [mm]

2 versions

Diffuser face similar to RAL7037, dust grey
Diffuser face similar to RAL 9005, black

Volume flow rate range

1 – 59 l/s or 4 – 213 m³/h

Supply air to room air temperature difference

-12 – 20 K

Crush resistance

> 5 kN

FBK

–

150

1 Type
FBK Floor diffuser

2 Surface floor grille and trim ring
1 Similar to RAL 7037 (dusty grey)
2 Similar to RAL 9005 (jet black)

3 Airflow direction
No entry: vertical
V vertical, adjustable swirl unit
H horizontal, adjustable swirl unit

4 Installation
No entry: spacing ring for stepped holes
KF Trim ring and spring clip fixing

5 Dirt trap
No entry: without dirt trap
SM flow rate adjustment on the rear side
SV flow rate adjustment on the front side

6 Plenum box
No entry: without plenum box
A with plenum box

7 Nominal size [mm]
150, 200

Order example: FBK-2-V-KF-SM-A/150

Type	FBK
Surface of diffuser core and trim ring	Similar to RAL 9005 (jet black)
Swirl unit (to set the airflow direction)	Vertical, adjustable swirl unit
Installation	Trim ring with spring clips
Dirt trap	Flow rate adjustment from the underside
Plenum box	With plenum box
Nominal size [mm]	150

Variants, Product details

FBK-1

Without clamping flange, without swirl unit

Dirt trap setting for volume flow balancing

For flow rate balancing (adjusting reduction), the height H₄ is changed between the upper edge of the dirt trap and the lower edge of the floor grille.

Installation in pressurised floors without plenum box
Plan plenum boxes for rooms with individual volume flows and/or supply air temperatures
For raised floors (from 10 mm panel magnitude) with carpet coverings use floor diffusers with clamping flange for better edge protection
Clamping flanges are suitable for compensating tolerances when creating the installation opening. A particularly tight fit is achieved when the minimum dimension of the installation opening is realised
By installation without a clamping flange in a stepped bore use the supplied spacing ring to ensure the function and height compensation
Variants with adjustable swirl unit can be adjusted manually. Setting position H provides a horizontal supply airflow, setting position V provides a vertical supply airflow

The schematic diagrams are provided to illustrate installation details.

Downloads

product information

Product data sheet FBK

FBK_PD_2024_02_12_DE_en Product data sheet 10 MB pdf

certificates

Declaration of hygiene conformity FBK

FB-K_HC_2024_05_DE_en Declaration 2 MB pdf
Environmental product Declaration FBK

FBK_EPD_2024_12_DE_en Environmental product Declaration 1,1 MB pdf
Non-CE Manufacturer's statement FBK

FBK_NotCE_2022_02_08_14_28_15_DE_en Manufacturer's statement 2 MB pdf

operation manuals

Assembly instructions Air diffusers - Floor diffusers FBK

FB-K_CD10084_V1_2024_07_GB_en Assembly instructions 2,2 MB pdf

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Round plastic air diffusers for installation in the floor

Allgemeine Informationen

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

Variants, Product details

Downloads

product information

Product data sheet FBK

certificates

Declaration of hygiene conformity FBK

Environmental product Declaration FBK

Non-CE Manufacturer's statement FBK

operation manuals

Assembly instructions Air diffusers - Floor diffusers FBK

TECHNICALLY NECESSARY

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