BCF - Floor diffuser

Circular diffuser for floor installation

Circular diffuser creating comfortable environments for the end user in demanding acoustic spaces.

  • Vertical air supply
  • Designed for use in auditoriums, theatres, concert halls, classrooms etc.
  • Comfortable, thermal and good acoustic conditions
  • Integrated installation to the floor
  • Ducted or connected to pressurized under-floor plenum chamber
  • Very limited distance between diffuser and seat required
  • Pressure drop of the diffuser enables self-balancing in most cases
  • Detachable front panel enables cleaning of the diffuser

The floor diffuser has a robust construction of galvanised steel, with black (RAL 9005) as standard colour.

The perforated plate inside the plenum box creates sufficient pressure loss to enable self-balancing in ductless applications. The space beneath the raised floor can be used as a plenum chamber.

The floor diffuser provides low velocity air distribution.

Halton BCF

Floor Diffuser

  • Vertical air supply
  • Designed for use in auditoriums, theatres, concert halls, classrooms etc.
  • Comfortable, thermal and good acoustic conditions
  • Integrated installation to the floor
  • Ducted or connected to pressurized under-floor plenum chamber
  • Very limited distance between diffuser and seat required
  • Pressure drop of the diffuser enables self-balancing in most cases
  • Detachable front panel enables cleaning of the diffuser

Dimensions

NS ØW ØW1 ØW2 ØD ØD1 H
190 190 176 165 160 95 220
250 250 235 225 220 120 300

Material

 Part  Material  Finishing  Note
 Front panel  Galvanised steel  Epoxy-painted, black
 (RAL 9005/50% gloss)
 Special colours
 available
 Perforated plate  Galvanised steel  Epoxy-painted, black
 (RAL 9005/50% gloss)
 Special colours
 available
 Plenum box  Galvanised steel  Epoxy-painted, black
 (RAL 9005/50% gloss)
 Special colours
 available

Function

Halton BCF floor diffusers are designed for under-floor air distribution systems.
Air is supplied into the space through the front panel at a low velocity, mixing with room air above the diffuser.
The perforated plate inside the plenum box creates sufficient pressure loss to enable self-balancing.
The recommended pressure level in the plenum chamber is 30 … 40 Pa.
The recommended supply air temperature is max. 3°C lower than the room temperature.
The supply airflow rate per unit is 10 … 15 l/s.

System Design

Floor supply system design

Halton BCF floor diffusers are designed for installation in raised floor systems like auditoriums, conference rooms, theatres, where a high level of comfort and conveyance is required. Supply air velocity must be very low to reduce discomfort that may be felt in the near zone.

We recommend designing as a displacement system with a maximum supply temperature of 3º C below room. Supply 10 to 15 l/s per unit and allow a distance between outlets of 0.8 to 1 meter. Where comfort requirements are less important, higher airflow rates can be used, generating increased velocities close to the diffuser.

Discomfort may be felt if exposed for an extended period of time. In this case outlets should be installed at least 1.5 m from the work place or other continuously occupied areas.
 

Connection of the diffusers

The Halton BCF is suitable for installations without ductwork connections (figures 1 and 2).
The space beneath the raised floor is used as a distribution plenum chamber. Construction includes a perforated cylinder inside the sleeve, which causes an efficient pressure loss and provides a self-balancing system.

We recommend designing the system so that the pressure inside the plenum chamber will be 10 … 40 Pa.
Where the plenum chamber has a large volume, we recommended the use of multiple air introduction points (figure 2).


Figure 1.


Figure 2.

Measurements 190

Velocity and temperature measurements;
Halton BCF 190

Halton BCF 190
Airflow rate, qv                    10 l/s (36 m³/h)
Supply air temperature        21 °C
Room temperature               24 °C
ΔT                                       -3°C

Height
mm
Distance
mm
  -325 -225 -125 0 125 225 325
700 0.03 m/s
23.3°C
0.07 m/s
22.7°C
  0.21 m/s
22.0°C
  0.11 m/s
22.4°C
0.13 m/s
22.8°C
500 0.01 m/s
23.4°C
0.02 m/s
22.9°C
  0.25 m/s
21.9°C
  0.03 m/s
22.4°C
0.02 m/s
22.9°C
300 0.01 m/s
23.4°C
0.01 m/s
23.2°C
  0.30 m/s
21.8°C
  0.03 m/s
22.6°C
0.01 m/s
23.4°C
200 0.01 m/s
23.2°C
0.02 m/s
23.1°C
  0.35 m/s
21.8°C
  0.04 m/s
22.7°C
0.01 m/s
23.1°C
100   0.04 m/s
23.1°C
0.49 m/s
22.3°C
0.40 m/s
22.03°C
0.50 m/s
22.0°C
0.08 m/s
22.7°C
50   0.03 m/s
23.7°C
0.43 m/s
23.4°C
0.41 m/s
22.9°C
0.46 m/s
22.9°C
0.04 m/s
23.5°C

 

Halton BCF 190
Airflow rate, qv                   14 l/s (50 m³/h)
Supply air temperature       23 °C
Room temperature              26 °C
ΔT                                      -3°C

Height
mm
Distance
mm
  -325 -225 -125 0 125 225 325
700 0.04 m/s
24.6°C
0.08 m/s
24.0°C
  0.49 m/s
23.1°C
  0.12 m/s
23.9°C
0.07 m/s
23.9°C
500 0.02 m/s
24.5°C
0.03 m/s
24.0°C
  0.06 m/s
23.1°C
  0.04 m/s
23.7°C
0.03 m/s
23.8°C
300 0.01 m/s
24.4°C
0.01 m/s
24.2°C
  0.49 m/s
23.1°C
  0.05 m/s
23.8°C
0.01 m/s
24.5°C
200 0.02 m/s
24.3°C
0.08 m/s
24.1°C
  0.35 m/s
23.0°C
  0.07 m/s
23.7°C
0.03 m/s
24.2°C
100   0.07 m/s
24.2°C
0.87 m/s
23.2°C
0.52 m/s
23.1°C
0.89 m/s
23.1°C
0.15 m/s
23.8°C
50   0.06 m/s
25.3°C
0.68 m/s
24.7°C
0.38 m/s
24.0°C
0.66 m/s
23.7°C
0.07 m/s
24.8°C

 

Halton BCF 190
Airflow rate qv                     16 l/s (58 m³/h)
Supply air temperature        23 °C
Room temperature               6 °C
ΔT                                       -3°C

Height
mm
Distance
mm
  -325 -225 -125 0 125 225 325
700 0.02 m/s
24.6°C
0.11 m/s
24.4°C
  0.49 m/s
23.4°C
  0.16 m/s
24.2°C
0.05 m/s
24.4°C
500 0.02 m/s
24.7°C
0.03 m/s
24.4°C
  0.07 m/s
23.3°C
  0.04 m/s
24.1°C
0.03 m/s
24.4°C
300 0.01 m/s
25.8°C
0.04 m/s
24.8°C
  0.58 m/s
23.2°C
  0.06 m/s
24.1°C
0.01 m/s
24.7°C
200 0.02 m/s
24.7°C
0.06 m/s
24.4°C
  0.43 m/s
23.5°C
  0.12 m/s
23.9°C
0.02 m/s
24.6°C
100   0.08 m/s
24.5°C
1.05 m/s
23.4°C
0.58 m/s
23.4°C
1.04 m/s
23.3°C
0.14 m/s
24.1°C
50   0.04 m/s
25.4°C
0.86 m/s
24.8°C
0.45 m/s
24.4°C
0.76 m/s
23.9°C
0.09 m/s
25.1°C

Measurements 250

Velocity and temperature measurements;
Halton BCF 250

Halton BCF 250
Airflow rate, qv                12 l/s (43 m³/h)
Supply temperature        20 °C
Room temperature          23 °C
ΔT                                   -3°C

Height
mm
 
Distance
mm
 
  -325 -225 -125 0 125 225 325
700  0.03 m/s
22.9°C
0.07 m/s
22.0°C
  0.07 m/s
21.1°C
  0.02 m/s
23.3°C
0.01 m/s
23.3°C
500  0.03 m/s
21.67°C
0.04 m/s
21.0°C
  0.05 m/s
20.3°C
  0.03 m/s
21.4°C
0.03 m/s
21.5°C
300  0.01 m/s
22.0°C
0.11 m/s
21.4°C
  0.20 m/s
20.1°C
  0.01 m/s
21.2°C
0.06 m/s
21.7°C
200  0.02 m/s
22.2°C
0.08 m/s
21.1°C
  0.18 m/s
20.2°C
  0.03 m/s
21.4°C
0.05 m/s
21.8°C
100    0.06 m/s
21.7°C
0.39 m/s
19.6°C
0.38 m/s
20.2°C
0.32 m/s
19.9°C
0.03 m/s
21.6°C
50    0.04 m/s
22.5°C
0.18 m/s
21.2°C
0.33 m/s
21.1°C
0.12 m/s
20.6°C
0.02 m/s
22.7°C

 

Halton BCF 250
Airflow rate, qv               16 l/s (58 m³/h)
Supply temperature        20 °C
Room temperature          23 °C
ΔT                                  -3°C

Height
mm
 
Distance
mm
 
  -325 -225 -125 0 125 225 325
700  0.08 m/s
21.6°C
0.16 m/s
20.8°C
  0.10 m/s
20.6°C
  0.06 m/s
21.2°C
0.05 m/s
21.7°C
500  0.02 m/s
21.5°C
0.04 m/s
21.1°C
  0.15 m/s
20.3°C
  0.04 m/s
21.3°C
0.02 m/s
21.8°C
300  0.01 m/s
22.1°C
0.03 m/s
21.4°C
  0.22 m/s
20.3°C
  0.01 m/s
21.7°C
0.01 m/s
22.5°C
200  0.02 m/s
22.06°C
0.04 m/s
21.5°C
  0.37 m/s
20.3°C
  0.02 m/s
21.5°C
0.03 m/s
22.3°C
100    0.07 m/s
21.9°C
0.41 m/s
20.2°C
0.39 m/s
20.3°C
0.36 m/s
20.1°C
0.04 m/s
21.9°C
50    0.05 m/s
22.6°C
0.20 m/s
21.9°C
0.38 m/s
21.3°C
0.30 m/s
20.9°C
0.06 m/s
22.7°C

 

Halton BCF 250
Airflow rate, qv                 20 l/s (72 m³/h)
Supply temperature          20 °C
Room temperature            23 °C
ΔT                                    -3°C

Height
mm
 
Distance
mm
 
  -325 -225 -125 0 125 225 325
700  0.09 m/s
21.6°C
0.18 m/s
21.5°C
  0.19 m/s
20.8°C
  0.08 m/s
21.5°C
0.04 m/s
21.9°C
500  0.03 m/s
21.6°C
0.04 m/s
21.5°C
  0.21 m/s
20.8°C
  0.03 m/s
21.5°C
0.02 m/s
22.0°C
300  0.01 m/s
22.1°C
0.02 m/s
21.8°C
  0.31 m/s
20.6°C
  0.01 m/s
21.8°C
0.02 m/s
22.3°C
200  0.02 m/s
22.0°C
0.04 m/s
21.7°C
  0.43 m/s
20.7°C
  0.02 m/s
22.1°C
0.02 m/s
22.3°C
100    0.06 m/s
21.9°C
0.69 m/s
20.4°C
0.47 m/s
20.7°C
0.61 m/s
20.4°C
0.04 m/s
22.2°C
50    0.02 m/s
22.6°C
0.30 m/s
21.9°C
0.48 m/s
21.6°C
0.41 m/s
21.1°C
0.04 m/s
23.1°C

Installation

The Halton BCF floor diffuser is installed into an installation hole with a diameter of 165 mm or 225mm, (see table below). The Halton BCF is mounted onto the floor.

The front panel is fastened with screws.

Installation hole dimension

NS  Diameter 
190  165 mm
250  225 mm

Adjustment

The airflow rate is adjusted by setting the static pressure in the plenum chamber to the required pressure level.

Servicing

Code Description
1.   Front panel
2.   Holes for fixing screws
3.   Plenum box
4.   Perforeted plate

Detach the front panel by unscrewing the fixing screws.
Clean the parts by wiping them with a damp cloth, instead of immersing in water.
Remove impurities and dust regularly using a vacuum cleaner.
Reattach front panel by screwing it back onto the plenum box.

Specification

The floor diffuser has a robust construction of galvanised steel, with black (RAL 9005) as standard colour.

The perforated plate inside the plenum box creates sufficient pressure loss to enable self-balancing in ductless applications. The space beneath the raised floor can be used as a plenum chamber.

The floor diffuser provides low velocity air distribution.

Order Code

BCF-D

D = Diameter of duct connection
       190, 250

Other Options and Accessories

CO = Colour
         B        Black

ZT = Tailord Product
         N        No
         Y        Yes

Code example

         BCF-190, CO=B, ZT=N

Downloads & Media

Halton BCF - se
Type
Datasheet
Language
Swedish (Sweden)
Size
243.2 kB
Halton BCF - fr
Type
Datasheet
Language
French (France)
Size
790.3 kB