TROX FBK-1 Round Plastic Air Diffusers Instructions

TROX FBK-1 Round Plastic Air Diffusers

Specifications

• Model: FBK-1-*-KF-SV
• Application: Floor diffusers for installation on the floor
• Nominal Sizes: 150, 200
• Surface: Floor grille and clamping flange
• Colors: Dust grey (RAL 7037) and black (RAL 9005)
• Adjustable Airflow: Vertical or horizontal
• Temperature Range: -12 to +20 K

Product Usage Instructions

Installation in Raised Floors without Plenum Box

1. Ensure the raised floor is pressurized.
2. Select the desired airflow direction (vertical or horizontal).
3. Place the floor diffuser in the installation opening.
4. Use the clamp spring attachment to secure the clamping flange.

Installation in Raised Floors with Plenum Box

1. Connect the plenum box to the on-site air duct system.
2. Select the desired airflow direction (vertical or horizontal).
3. Place the floor diffuser in the installation opening.
4. Use the clamp spring attachment to secure the clamping flange.

Adjusting the Airflow Direction

To adjust the airflow direction, follow these steps:

1. Locate the adjustable swirl unit at the rear (or front) of the diffuser.
2. For vertical airflow, leave the swirl unit unaltered.
3. For vertical swirling airflow, manually adjust the swirl unit to the desired position.
4. For horizontal swirling airflow, manually adjust the swirl unit to the desired position.

Adjusting the Dirt Trap (Damper Element)
To adjust the dirt trap and balance the volume flow, follow these steps:

1. Locate the adjustable dirt trap at the rear (or front) of the diffuser.
2. For models with “-SM” or “-SV” variants, the dirt trap adjustment also serves as a damper element.
3. Manually adjust the dirt trap to achieve the desired volume flow balance.

MODELS

FBK

ROUND PLASTIC AIR DIFFUSERS FOR INSTALLATION IN THE FLOOR
Air diffuser for different installation situations and room air flows

• Nominal sizes 150, and 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
• The 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

General information

Application

• Floor diffusers as supply air diffusers for comfort areas
• Installation in raised floors without plenum box if it is constructed as a pressurized 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 colors – 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 features

• 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 a clamping flange
• Quick and easy installation of floor diffusers with clamping flange and clamp spring attachment
• With or without a 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
The 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 a 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

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

Clamping flange with clamp spring attachment

1. Anti-twist device for the grille insert
2. Covers the installation opening
3. Clamp spring attachment enables different magnitudes of the raised floor and the compensation of large cut-out tolerances when creating the installation openings.
4. For the tightest possible fit of the clamping flange, we recommend the minimum installation dimension
5. Leveling 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

Materials and surfaces

• The grille core and clamping flange are 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 galvanized steel
• Plenum box made of galvanized sheet steel
• Plastic surface, optionally in the colors 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

• 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 an 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 operations. 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 airflow 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 airflow 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. This includes corridors or similar circulation areas.

Schematic illustration

• A FBK-…- KF B FBK
• C FBK-… -KF-A 1 Diffuser face
• Housing with clamping flange and clamping springs 3 Spacing ring
• Optional
• Dirt trap
• Plenum box
• Base plate (on-site)

• 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
---|---|---|---
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
---|---|---|---
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

| H 4 = **maximum| H 4 = 45| H 4 = 35
---|---|---|---|---
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

| H 4 = **maximum| H 4 = 50| H 4 = 40
---|---|---|---|---
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

| H 4 = **maximum| H 4 = 45| H 4 = 35
---|---|---|---|---
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

| H 4 = **maximum| H 4 = 50| H 4 = 40
---|---|---|---|---
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

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 an adjustable swirl unit for vertical airflow
• With an 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 is made of ABS plastic UL94-V-0 which also serves as an adjustable damper element for volume flow rate balancing

Plenum box

• Without a plenum box for installation on a pressurised floor
• With plenum box made of galvanized 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]

• 150
• 200

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

Type
FBK Floor diffuser

Surface floor grille and trim ring

1. Similar to RAL 7037 (dusty grey)
2. Similar to RAL 9005 (jet black)

Airflow direction

• No entry: Vertical
• V vertical, adjustable swirl unit
• H horizontal, adjustable swirl unit

Installation

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

Dirt trap

• No entry: without dirt trap
• SF flow rate adjustment on the rear side
• SV flow rate adjustment on the front side (diffuser face)

Plenum box

• No entry: without plenum box
• A with plenum box
• Nominal size [mm]
• 150, 200
• Order example: FBK-2-V-KF-SM-A/150

Type FBK

• The surface of the diffuser core and trim ring is 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

Black floor diffuser with dirt trap
Floor diffuser with clamping flange, dirt trap with front adjustment, and plenum box

• Installation in pressurized 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 flanges 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 realized
• By installation without a clamping flange in a stepped bore use the supplied spacing ring to ensure the function and height compensation Variants with an 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.

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.

Airflow with horizontally adjusted swirl unit

Air flow with vertically adjusted swirl unit

FAQ

FAQ (Frequently Asked Questions)

• Q: What is the difference between models FBK-1 and FBK-2?
  • A: The difference lies in their construction. FBK-1 has a clamping flange and dirt trap, while FBK-2 has a dirt trap only. Both models are round plastic air diffusers for installation in the floor.
• Q: Can I use the floor diffuser without a plenum box?
  • A: Yes, you can install the floor diffuser on raised floors without a plenum box if the floor is pressurized. However, for individual ventilation in rooms or zones, it is recommended to use a plenum box.
• Q: What are the available colors for the surface of the floor grille and clamping flange?
  • A: The floor grille and clamping flange are available in dust grey (RAL 7037) and black (RAL 9005).
• Q: What is the temperature range for the supply of air?
  • A: The floor diffuser is suitable for supplying air temperature differences of -12 to +20 K.

References

• TROX UK - Industry leading manufacturers and suppliers of superior quality air conditioning, ventilation, fire and smoke protection systems, components and controls | TROX UK Ltd
• CONTACT | TROX UK Ltd
• Disclaimer | TROX UK Ltd
• Imprint | TROX UK Ltd
• OUR PRIVACY POLICY | TROX UK Ltd
• TROX UK's Terms and Conditions of Sale | TROX UK Ltd

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