CFE Overflow Element

CFE-T-PP

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Design options

with perforated sheet cover or

slot diffuser face

<strong>CFE-T-PP/SC, installation in lightweight partition wall</strong>

T-style construction, for lightweight partition walls

{249}

Z-style construction, for lightweight partition walls

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Installation in lightweight partition walls
with metal support structure

CFE

Crossflow element for lightweight partition walls

Crossflow elements offer building owners and architects with special requirements additional design options for air distribution

With recess for air diffusers – with fronts of different optics
Without recess for air diffusers – for free design options depending on the chosen wall opening
With integrated cross talk silencer and insulating strips for sound insulation
Nominal lengths from 550 - 1175 mm, in increments of 1 mm
Nominal heights from 290 - 440 mm, in increments of 1 mm
The wide range of dimensions allows a large selection of different installation situations, with low pressure loss and high sound insulation values
Installation in lightweight partition walls with 50 mm or 75 mm stud frame width and 100 mm or 125 mm wall thickness
with neck extension Wall thicknesses up to 300 mm

Optional equipment

Diffuser face powder-coated in RAL CLASSIC colours

Initialize order code

General information

Application

Crossflow elements are suitable as cross talk silencers for air transfer flows in comfort zones
Due to their diversity of variants and high flexibility, they can be used for many applications

Special characteristics

Different construction styles allow individual adaptation to local conditions
Low differential pressure
Crossflow elements in T- and Z-design without recess for an air diffuser are suitable for (system) partition walls
Cross talk silencers reduce noise transmission to adjacent rooms
To prevent sound transmission via the casing, insulation strips are attached to the crossflow element
Tool-free assembly of the diffuser face enables quick installation after completion of the drywall work
High-quality appearance of diffuser face due to powder coating according to RAL-CLASSIC colour scale
Crossflow elements without recess: free design options of the wall openings for builders and architects while maintaining the free cross-section ≥ 51 %
Nominal length and nominal heights selectable in mm steps

Nominal sizes

Nominal length L_N:

550 - 1175 mm (in increments of 1mm)

Nominal height H_N:

290 - 440 mm (in increments of 1mm)

Unit depth or wall thickness:

Construction style Z

100 - 300 mm (in increments of 1mm)

Construction style T

125 - 300 mm (in increments of 1mm)

Variants

CFE-..:

-*: in Z or T design
-*: with or without recess for diffuser face
-PP: Perforated sheet cover
-SC: Slot diffuser face

Construction

Surface finish of diffuser faces:

Powder-coated RAL 9010, pure white, GE 50
P1: powder-coated RAL 9006, white aluminium, GE 30
P1: powder-coated in other RAL CLASSIC colours, GE 70

Construction features

With or without recess for diffuser face
A diffuser face requires a construction with recess for the diffuser face
Nominal lengths from 550 - 1175 mm and nominal heights from 290 - 440 mm available in mm steps
The perforated sheet cover PP has a free cross-section of approx. 51 %, the hole diameter is 6 mm, and the rows of holes are arranged offset to each other
The slot diffuser face SC offers the largest possible free cross-section for very low pressure loss

Material and surfaces

Casings and diffuser faces made of galvanised sheet steel
Acoustic lining made of mineral wool
Insulation strips on the casing made of closed cell PE foam
Diffuser faces powder-coated RAL9010, GE 50
P1: powder-coated colour according to RAL CLASSIC

Mineral wool:

Mineral wool on surfaces in contact with air are laminated with glass fibre fabric, abrasion-resistant up to 20 m/s
Acc. to EN 13501, fire rating class A1, non-combustible
RAL quality mark RAL-GZ 388
Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No 1272/2008
Inert to fungal and bacterial growth

Standards and guidelines

Sound power level of air-regenerated noise measured according to DIN EN ISO 5135
Conforms to VDI 6022
Sound reduction index according to DIN EN ISO 10140 and DIN EN ISO 717-1

Maintenance

Low maintenance, as there is no wear and tear due to design and materials used

Inspection and cleaning according to VDI 6022

Technical information

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

Schematic illustration, CFE-Z-PP

1 Casing

2 Perforated sheet metal cover

3 Mineral wool

4 Glass silk nonwoven

5 Sealing strips

Type CFE crossflow elements can be installed in lightweight partition walls. Due to the pressure difference, the air flows e.g. from the office area as exhaust air into the hallway, into indoor zones or neighbouring areas with suspended ceilings. A central exhaust air system can be used there. Integrated acoustic lining reduces noise transmission into adjacent rooms. To avoid sound transmission on lightweight walls, insulation strips are attached to the casing for sound decoupling.

Nominal lengths	550 - 1175 in mm increments
Nominal height	290 - 440 in mm increments
maximum volume flow at ∆pt = 5 Pa, T-style construction, with slot cover	124 m³/h
maximum volume flow at ∆pt = 5 Pa, Z-style construction, with slot cover	120 m³/h
maximum volume flow at ∆pt = 10 Pa, T-style construction, with slot cover	175 m³/h
maximum volume flow at ∆pt = 10 Pa, Z-style construction, with slot cover	169 m³/h

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

Exact values for all parameters can be determined with our Easy Product Finder design program.

Weighted sound reduction index, standard sound pressure level and sound power level, L_N= 550, S = 0.019 m²

Variant	H_N	R_w [dB]	D_n,e,w [dB]	∆p_t = 5 Pa		∆p_t = 10 Pa
Variant	H_N	R_w [dB]	D_n,e,w [dB]	q_v [m³/h]	L_wa [dB(A)]	q_v [m³/h]	L_wa [dB(A)]
CFE-T-SC	290	13.5	40.7	58	<15	82	16
CFE-T-SC	340	16	43.2	57	<15	80	15
CFE-T-SC	440	19.2	46.4	54	<15	77	<15
CFE-T-PP	290	13.5	40.7	49	<15	70	<15
CFE-T-PP	340	16.5	43.7	48	<15	68	<15
CFE-T-PP	440	19.4	46.6	47	<15	66	<15
CFE-Z-SC	290	13.4	40.6	56	<15	79	19
CFE-Z-SC	340	14.8	42	55	<15	78	19
CFE-Z-SC	440	20.8	48	53	<15	75	18
CFE-Z-PP	290	13.3	40.5	47	<15	66	17
CFE-Z-PP	340	15	42.2	46	<15	65	17
CFE-Z-PP	440	20.8	48	45	<15	63	16

Weighted sound reduction index, standard sound pressure level and sound power level, L_N= 850, S = 0.030 m²

Variant	H_N	R_w [dB]	D_n,e,w [dB]	∆p_t = 5 Pa		∆p_t = 10 Pa
Variant	H_N	R_w [dB]	D_n,e,w [dB]	q_v [m³/h]	L_wa [dB(A)]	q_v [m³/h]	L_wa [dB(A)]
CFE-T-SC	290	13.5	38.8	90	<15	127	18
CFE-T-SC	340	16	41.3	88	<15	124	17
CFE-T-SC	440	19.2	44.5	84	<15	119	16
CFE-T-PP	290	13.5	38.8	76	<15	108	<15
CFE-T-PP	340	16.5	41.8	74	<15	105	<15
CFE-T-PP	440	19.4	44.7	73	<15	103	<15
CFE-Z-SC	290	13.4	38.7	87	<15	123	21
CFE-Z-SC	340	14.8	40.1	85	<15	121	21
CFE-Z-SC	440	20.8	46.1	82	<15	116	19
CFE-Z-PP	290	13.3	38.6	72	<15	102	19
CFE-Z-PP	340	15	40.3	71	<15	100	19
CFE-Z-PP	440	20.8	46.1	69	<15	98	18

Weighted sound reduction index, standard sound pressure level and sound power level, L_N= 1000, S = 0.035 m²

Variant	H_N	R_w [dB]	D_n,e,w [dB]	∆p_t = 5 Pa		∆p_t = 10 Pa
Variant	H_N	R_w [dB]	D_n,e,w [dB]	q_v [m³/h]	L_wa [dB(A)]	q_v [m³/h]	L_wa [dB(A)]
CFE-T-SC	290	13.5	38.1	105	<15	149	18
CFE-T-SC	340	16	40.6	103	<15	146	18
CFE-T-SC	440	19.2	43.8	99	<15	140	17
CFE-T-PP	290	13.5	38.1	90	<15	127	15
CFE-T-PP	340	16.5	41.1	87	<15	124	<15
CFE-T-PP	440	19.4	44	85	<15	121	<15
CFE-Z-SC	290	13.4	38	102	<15	144	22
CFE-Z-SC	340	14.8	39.4	100	<15	142	21
CFE-Z-SC	440	20.8	45.4	96	<15	136	20
CFE-Z-PP	290	13.3	37.9	85	<15	120	20
CFE-Z-PP	340	15	39.6	83	<15	117	19
CFE-Z-PP	440	20.8	45.4	81	<15	115	19

Weighted sound reduction index, standard sound pressure level and sound power level, L_N= 1175, S = 0.041 m²

Variant	H_N	R_w [dB]	D_n,e,w [dB]	∆p_t = 5 Pa		∆p_t = 10 Pa
Variant	H_N	R_w [dB]	D_n,e,w [dB]	q_v [m³/h]	L_wa [dB(A)]	q_v [m³/h]	L_wa [dB(A)]
CFE-T-SC	290	13.5	37.4	124	<15	175	19
CFE-T-SC	340	16	39.9	121	<15	171	18
CFE-T-SC	440	19.2	43.1	116	<15	164	17
CFE-T-PP	290	13.5	37.4	105	<15	149	16
CFE-T-PP	340	16.5	40.4	103	<15	145	15
CFE-T-PP	440	19.4	43.3	100	<15	142	<15
CFE-Z-SC	290	13.4	37.3	120	<15	169	22
CFE-Z-SC	340	14.8	38.7	118	<15	167	22
CFE-Z-SC	440	20.8	44.7	113	<15	160	21
CFE-Z-PP	290	13.3	37.2	100	<15	141	21
CFE-Z-PP	340	15	38.9	98	<15	138	20
CFE-Z-PP	440	20.8	44.7	95	<15	135	19

Specification text

Crossflow elements with cross talk silencers are used for air transfer flow into adjacent rooms and are suitable for comfort areas.

The crossflow element is available in rectangular Z or T design. The nominal height and nominal length are variable within the limits in mm steps. Therefore, the crossflow element can be optimally adapted to project-specific requirements.

The design without recess for an air diffuser offers builders and architects, in compliance with the free cross section of ≥ 51%, various design options. For the version with recess for an air diffuser, a choice can be made between different diffuser fronts. The perforated diffuser face -PP has a free area of approx. 51%. The hole diameter is 6 mm, staggered pitch.

Fixing a diffuser face to the crossflow element after the drywalling has been completed is quick and easy.

The crossflow element includes a cross talk silencer with acoustic lining that reduces noise transmission to adjacent rooms. To prevent sound transmission via the casing, sealing strips are attached to the crossflow element.

Suitable for the space saving or concealed installation in lightweight partition walls with different stand widths.

Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Sound reduction index according to DIN EN ISO 10140 and DIN EN ISO 717-1.

Crossflow element and diffuser face made of galvanised sheet steel.

Sound insulation material made of mineral wool.

Mineral wool:

Mineral wool on surfaces in contact with air are laminated with glass fibre fabric, abrasion-resistant up to 20 m/s
Acc. to EN 13501, fire rating class A1, non-combustible
RAL quality mark RAL-GZ 388
Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No 1272/2008
Inert to fungal and bacterial growth

Equivalence criteria

Different construction styles and sizes allow for meeting local and project-specific requirements
Low differential pressure
The crossflow element in Z-style construction without a recess for the diffuser face is suitable for thin lightweight partition walls with metal support structure
An integrated cross talk silencer reduces noise transmission into adjacent rooms.
Sealing strips on the casing minimise noise transmission
Diffuser face powder-coated in a RAL CLASSIC colour scale

Variants

Surface finish of diffuser faces:

Powder-coated RAL 9010, pure white, GU 50
P1: powder-coated RAL 9006, white aluminium, GU30
P1: powder-coated in other RAL CLASSIC colours, GU 70

Technical data

Nominal length: 550 to 1175 mm (in increments of 1 mm)
Nominal height: 290 to 440 mm (in increments of 1 mm)
Wall thicknesses: 100/125 - 300 mm (in increments of 1 mm)
Maximum volume flow rate ∆p_t = 5 Pa: 124 m³/h
Maximum volume flow rate ∆p_t = 10 Pa: 175 m³/h

Sizing data

L_WA[dB(A)]

q_v [m³/h]

Δp_t[Pa]

D_{n, e, w}[dB]

R_w [dB]

CFE

–

850 × 340

300 × 27 × 203

P1 - RAL 9016

1 Type
CFE Crossflow element

2 Construction
Z Construction style Z
T Construction style T

3 Air diffuser
No entry: without recess for air diffuser

With recess for air diffuser
PP Perforated metal diffuser faces
SC Slot diffuser faces

4 Construction style
Only with air diffuser (PP, SC)
No entry: symmetrical neck lengths
A: asymmetrical neck length

5 Nominal size [mm]
Nominal length × nominal height

Nominal length (L_N)
550 – 1175

Nominal height (H_N)
290 – 440 (standard height 340)

6 Equipment depth [mm]
Nominal depth (T_N) × neck length left (T_L) × neck length right (T_R) specify

Nominal depth (T_N)
100 – 300

Neck length left (T_L)
27 – 203

Neck length right (T_R)
27 – 203

7 Diffuser face surface
No entry: powder-coated RAL 9010 (pure white)
P1 powder-coated, specify RAL CLASSIC colour

Gloss level
RAL 9010 GU 50
RAL 9006 GU 30
All other RAL colours GU 70

Order example: CFE-T-SC-A/850×300/300×27×203/P1-RAL9016

Type	CFE - Crossflow element
Construction	Construction style T
Air diffuser	Slot diffuser faces
Construction style	asymmetrical neck length
Nominal size [mm]	Nominal length 850, nominal height 300
Unit depth [mm]	Nominal depth 300, neck length left 27, neck length right 203
Diffuser face surface	Powder-coated, RAL 9016 (traffic white)

Variants

Perforated sheet cover PP

Application

Überströmelemente sind als Telefonieschalldämpfer für überströmende Raumluft für Komfortbereiche geeignet
Aufgrund Ihrer Variantenvielfalt und hohen Flexibilität können sie für viele Einsatzfälle genutzt werden

Downloads

product information

Product data sheet CFE

CFE_PD_2024_07_17_DE_en Product data sheet 750 KB pdf

operation manuals

Installation manual CFE

CFE_IM_P0010437_V1_2023_03_GB_en Installation manual 520 KB pdf

CFE

Crossflow element for lightweight partition walls

General information

Technical information

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

Variants

Downloads

product information

Product data sheet CFE

operation manuals

Installation manual CFE

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