RFD

RFD-Q-D

Circular diffuser face

With discharge nozzle

Without discharge nozzle

Horizontal swirling air discharge

WITH LOW SOUND POWER LEVEL FOR COMFORT AND INDUSTRIAL ZONES, WITH FIXED AIR CONTROL BLADES

Circular and square ceiling swirl diffusers

Nominal sizes 5, 6, 8, 10, 12, 16 in
Volume flow rate range 8.2 - 770 cfm
Diffuser face made of galvanised sheet steel, powder-coated, or of aluminium (depending on variant)
For supply and extract air
For variable and constant volume flows
For all types of ceiling systems
With discharge nozzle ideal for cooling in case of freely suspended installation
High induction results in a rapid reduction of the temperature difference and airflow velocity
Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 3 ft (center line to center line)
Ideal for comfort zones

Optional equipment and accessories

Exposed diffuser face available in RAL CLASSIC colors
Horizontal or vertical duct connection
Plenum box with cord-operated damper blade and pressure tap
Shallow plenum box

Initialize order code

Application

Application

Type RFD 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)
For variable and constant volume flows
For supply air to room air temperature differences from –21.6 to 18°F
For room heights up to 13 ft (lower edge of suspended ceiling)
For all types of ceiling systems
With an extended border and discharge nozzle also suitable for freely suspended installation (supply air variant)

Special characteristics

Low sound power level, ideal for comfort zones
Fixed blades
For all types of ceiling systems
Horizontal or vertical duct connection
Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (center line to center line)

Nominal sizes

5, 6, 8, 10, 12, 16

Description

Variants

RFD-Q: Square diffuser face
RFD-R: Circular diffuser face
RFD-*-D: Diffuser face with discharge nozzle

Connection

K: Vertical duct connection, with duct collar
US: Vertical duct connection, with transition piece
A: Horizontal duct connection, with plenum box

Only RFD-R

UO: Vertical duct connection, with transition piece and cross bar

Only RFD-R-D

UD: Vertical duct connection, with transition piece, cross bar and discharge nozzle
N: Horizontal duct connection, with shallow plenum box to be installed above open cell ceilings

Parts and characteristics

Circular or square diffuser face
Diffuser face with radially arranged fixed air control blades

Attachments

M: Damper blade for volume flow rate balancing
MN: Pressure tap and cord-operated damper blade for volume flow rate balancing with the diffuser face in place

Accessories

Lip seal

Construction features

Inlet suitable for circular ducts to EN 1506 or EN 13180
Inlet with groove for lip seal (if accessory lip seal has been ordered)

Materials and surfaces

Q: Diffuser face made of aluminum
R: Diffuser face made of galvanized sheet steel
Plenum box, duct collar and cross bar made of galvanized sheet steel
Transition piece made of aluminum
Lip seal made of rubber
Diffuser face powder-coated RAL 9010, pure white
P1: Powder-coated, RAL CLASSIC color

Standards and guidelines

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

Maintenance

Maintenance-free as construction and materials are not subject to wear
Inspection and cleaning to VDI 6022

Technical information

Function, Technical data, Quick sizing, Specification text, ORDER CODE

Schematic illustration of the RFD-R-D, with plenum box for horizontal duct connection

① Diffuser face
② Central fixing screw
③ Plenum box
④ Cross bar
⑤ Suspension hole
⑥ Spigot

Optional
⑦ Lip seal
⑧ Pressure tap
⑨ Damper blade for volume flow rate balancing
⑩ Green cord for closing the damper blade
⑪ White cord for opening the damper blade
⑫ Measuring tube
⑬ Text label indicating plenum box variant

Functional description

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 RFD ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply air to room air temperature difference may range from –12 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.

To give rooms an aesthetic, uniform look, Type RFD diffusers may also be used for extract air.

Nominal sizes	125, 160, 200, 250, 315, 400 mm
Minimum volume flow rate, with Δt_Z = –6 K	4 – 36 l/s or 14 – 130 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A)	22 – 330 l/s or 79 – 1188 m³/h
Supply air to room air temperature difference	–12 to +10 K

Quick sizing tables provide a good overview of the volume flow rates and 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 with our Easy Product Finder design programme.

RFD-*-K, sound power level and total differential pressure

Nominal size	V		Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)
125	4.4	16	2	<15
125	10	36	16	29
125	15	54	36	38
125	24	86	92	50
160	5	18	1	<15
160	15	54	8	16
160	30	108	34	34
160	47	169	83	50
200	7	25	1	<15
200	30	108	15	26
200	50	180	43	38
200	75	270	96	50
250	10	36	1	<15
250	45	162	14	27
250	80	288	43	41
250	114	410	87	50
315	19	68	1	<15
315	75	270	12	25
315	130	468	37	40
315	185	666	75	50
400	27	97	1	<15
400	95	342	12	26
400	165	594	35	40
400	230	828	69	50

RFD-*-D-K, sound power level and total differential pressure

Nominal size	V		Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)
125	4.4	16	1	<15
125	15	54	8	18
125	30	108	33	36
125	46	166	79	50
160	6,4	23	1	<15
160	25	90	8	16
160	45	162	26	33
160	76	274	74	50
200	9	32	0	<15
200	45	162	11	23
200	75	270	31	37
200	110	396	66	50
250	14	50	0	<15
250	65	234	10	21
250	115	414	33	38
250	164	590	66	50
315	25	90	1	<15
315	95	342	11	23
315	165	594	32	38
315	240	864	67	50
400	36	130	1	<15
400	135	486	12	24
400	235	846	36	40
400	330	1188	71	50

RFD-*-US, sound power level and total differential pressure

Nominal size	V		Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)
125	4	14	2	<15
125	10	36	17	28
125	15	54	37	39
125	22	79	80	50
160	5	18	1	<15
160	20	72	15	24
160	30	108	35	37
160	42	151	68	50
200	7	25	1	<15
200	30	108	22	23
200	50	180	60	39
200	70	252	117	50
250	10	36	1	<15
250	45	162	19	25
250	80	288	61	40
250	114	410	123	50
315	19	68	1	<15
315	70	252	17	25
315	130	468	59	42
315	170	612	101	50
400	27	97	1	<15
400	90	324	15	24
400	155	558	44	39
400	220	792	88	50

RFD-*-D-US, sound power level and total differential pressure

Nominal size	V		Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)
125	4.4	16	1	<15
125	15	54	10	17
125	25	90	28	34
125	38	137	64	50
160	6	22	1	<15
160	25	90	9	16
160	45	162	29	35
160	66	238	62	50
200	9	32	1	<15
200	40	144	22	20
200	70	252	66	37
200	102	367	140	50
250	14	50	1	<15
250	60	216	21	22
250	105	378	63	39
250	145	522	120	50
315	25	90	2	<15
315	90	324	21	22
315	155	558	62	38
315	220	792	125	50
400	36	130	1	<15
400	120	432	17	22
400	205	738	49	38
400	285	1026	95	50

RFD-*-A, sound power level and total differential pressure

Nominal size	V		Damper blade position
Nominal size	V		0°		45°		90°
Nominal size	V		Δp_t	L_WA	Δp_t	L_WA	Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
125	4	14	2	<15	3	<15	4	<15
125	10	36	17	28	19	28	26	28
125	15	54	38	38	43	39	58	38
125	22	79	82	50	93	49	124	50
160	5	18	1	<15	1	<15	1	<15
160	15	54	9	16	11	17	15	15
160	30	108	35	34	43	36	60	34
160	47	169	86	50	105	51	147	51
200	7	25	1	<15	1	<15	1	<15
200	25	90	12	21	15	21	20	21
200	44	158	36	35	45	36	61	35
200	70	252	91	50	114	52	156	51
250	10	36	1	<15	1	<15	1	<15
250	45	162	14	25	19	26	25	25
250	75	270	40	38	52	40	70	39
250	110	396	86	50	113	52	151	52
315	19	68	1	<15	1	<15	2	<15
315	70	252	12	24	17	26	22	24
315	120	432	35	39	49	40	63	38
315	175	630	75	50	103	52	135	50
400	27	97	1	<15	1	<15	1	<15
400	90	324	10	24	13	25	17	24
400	160	576	33	40	40	41	53	39
400	220	792	63	50	75	52	100	49

RFD-*-D-A, sound power level and total differential pressure

Nominal size	V		Damper blade position
Nominal size	V		0°		45°		90°
Nominal size	V		Δp_t	L_WA	Δp_t	L_WA	Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
125	4.4	16	1	<15	1	<15	3	<15
125	15	54	12	19	17	20	33	23
125	30	108	48	37	68	40	132	41
125	43	155	98	50	139	52	271	53
160	6.4	23	1	<15	1	<15	2	<15
160	30	108	16	22	24	22	44	25
160	50	180	45	37	68	38	123	41
160	71	256	91	50	138	53	250	54
200	9	32	1	<15	1	<15	2	<15
200	40	144	13	21	19	22	34	24
200	70	252	39	37	59	38	104	40
200	105	378	89	50	133	53	234	54
250	14	50	1	<15	1	<15	2	<15
250	60	216	12	20	18	23	32	23
250	108	389	39	37	58	39	103	40
250	153	551	79	50	116	53	207	52
315	25	90	1	<15	2	<15	2	<15
315	90	324	13	23	20	25	29	25
315	150	540	35	38	55	40	82	40
315	215	774	72	50	114	52	168	52
400	36	130	1	<15	1	<15	2	<15
400	120	432	11	23	15	23	22	23
400	205	738	33	38	44	39	65	39
400	290	1044	65	50	87	50	131	51

Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones and industrial zones. Diffuser face with fixed 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 which consists of the diffuser face with radially arranged fixed air control blades and either a spigot only or a plenum box with side entry or top entry spigot, and suspension holes or suspension lugs.

The diffuser face is fixed to the cross bar with a central screw.

Spigot suitable for ducts to EN 1506 or EN 13180.

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

Special characteristics

Low sound power level, ideal for comfort zones
Fixed blades
For all types of ceiling systems
Horizontal or vertical duct connection
Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)

Materials and surfaces

Q: Diffuser face made of aluminium
R: Diffuser face made of galvanised sheet steel
Plenum box, duct collar and cross bar made of galvanised sheet steel
Transition piece made of aluminium
Lip seal made of rubber
Diffuser face powder-coated RAL 9010, pure white
P1: Powder-coated, RAL CLASSIC colour

Technical data

Nominal sizes: 125, 160, 200, 250, 315, 400 mm
Minimum volume flow rate, with Δt_Z = –6 K: 4 – 36 l/s or 14 – 130 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A): 22 – 330 l/s or 79 – 1188 m³/h
Supply air to room air temperature difference: –12 to +10 K

Sizing data

V _______________________ [m³/h]
Δp_t _______________________ [Pa]

Air-regenerated noise

L_WA _______________________ [dB(A)]

Life cycle assessment
A life cycle assessment is available for the product series in form of an Environmental Product Declaration (EPD) that has been checked and published by a programme holder.

Type
RFD Swirl diffuser

Construction style
R Circular
Q Square

Construction
No entry: without discharge nozzle
D With discharge nozzle

Connection
K       Vertical, with duct collar
US       Vertical, with transition piece
A       Horizontal, with plenum box
               Only RFD-R
UO       Vertical, with transition piece and cross bar
               Only RFD-R-D
UD       Vertical, with transition piece, cross bar and discharge nozzle
N       Horizontal, with shallow plenum box

Damper blade for volume flow rate balancing
       No entry: none
M       With (only for connection types A and N)
MN       With cords and pressure tap (only for connection type A)

Accessories
No entry: none
L With lip seal (only for connection types A and N)

Nominal size [mm]
125
160
200
250
315
400

Exposed surface
No entry required
Powder-coated RAL 9010, pure white

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

Order example: RFD–Q–D–A–M–l/200/P1-RAL

Construction style	Square
Construction	With discharge nozzle
Connection	Horizontal
Damper blade for volume flow rate balancing	With
Accessories	Lip seal
Nominal size	200
Exposed surface	RAL 9010, traffic white, gloss level 20 %

Variants, Dimensions and weight, Product details

RFD-Q-D

RFD-Q-K

Variant

Ceiling swirl diffuser with square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Circular duct collar for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-D-K

Variant

Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Circular duct collar for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-US

Variant

Ceiling swirl diffuser with square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Transition piece for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-D-US

Variant

Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Transition piece for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-A

Variant

Ceiling swirl diffuser with square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Plenum box for horizontal duct connection
Circular opening to accommodate the diffuser face
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 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)

RFD-Q-D-A

Variant

Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Square diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Plenum box for horizontal duct connection
Circular opening to accommodate the diffuser face
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 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)

RFD-R-K

Variant

Ceiling swirl diffuser with circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Circular duct collar for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-K

Variant

Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Circular duct collar for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-US

Variant

Ceiling swirl diffuser with circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Transition piece for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-US

Variant

Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Transition piece for connection to a vertical duct

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-UO

Variant

Ceiling swirl diffuser with circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Transition piece for connection to a vertical duct
Simple installation of the diffuser face due to central fixing screw with decorative cap

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-UD

Variant

Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Transition piece for connection to a vertical duct
Simple installation of the diffuser face due to central fixing screw with decorative cap

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-A

Variant

Ceiling swirl diffuser with circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Plenum box for horizontal duct connection
Circular opening to accommodate the diffuser face
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 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)

RFD-R-D-A

Variant

Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Plenum box for horizontal duct connection
Circular opening to accommodate the diffuser face
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 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)

RFD-R-D-N

Variant

Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

125, 160, 200, 250, 315, 400

Parts and characteristics

Circular diffuser face
Discharge nozzle improves aerodynamic and acoustic characteristics
Plenum box for horizontal duct connection
Compact unit which consists of the diffuser and a plenum box, shallow construction for installation above open cell ceilings
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)

RFD-Q-K

RFD-Q-K, RFD-Q-D-K

Nominal size	RFD-Q-K □Q₁ mm	RFD-Q-K H₂ mm	RFD-Q-K m kg	RFD-Q-D-K □Q₁ mm	RFD-Q-D-K H₂ mm	RFD-Q-D-K m kg	ØD mm	H₁ mm
125	198	42	0.6	198	67	0.7	123	8
160	198	45	0.7	248	70	0.9	158	8
200	248	45	1.0	248	70	1.2	198	8
250	298	42	1.5	298	67	1.7	248	8
315	398	45	2.4	398	80	2.9	313	8
400	498	45	3.6	498	80	4.3	398	8

RFD-Q-US, RFD-Q-D-US

Nominal size	RFD-Q-US □Q₁ mm	RFD-Q-US H₂ mm	RFD-Q-US m kg	RFD-Q-D-US □Q₁ mm	RFD-Q-D-US H₂ mm	RFD-Q-D-US m kg	ØD mm	H₁ mm	ØD₃ mm	C mm
125	198	120	0.7	198	145	0.8	98	8	127	40
160	198	125	0.9	248	150	1.1	123	8	162	40
200	248	128	1.2	248	153	1.4	158	8	202	40
250	298	133	1.7	298	158	2.0	198	8	252	40
315	398	140	2.7	398	175	3.2	248	8	318	40
400	498	150	4.1	498	185	4.7	313	8	403	40

RFD-Q-A, RFD-Q-D-A

Nominal size	RFD-Q-A □Q₁ mm	RFD-Q-A H₃ mm	RFD-Q-A A mm	RFD-Q-A m kg	RFD-Q-D-A □Q₁ mm	RFD-Q-D-A H₃ mm	RFD-Q-D-A A mm	RFD-Q-D-A m kg	H₁ mm	□Q₃ mm	H₄ mm	ØD₄ mm	ØD mm	C mm	Plenum box
125	198	255	170	3.0	198	276	196	3.1	8	216	195	125	98	50	AK-Uni-028
160	198	280	182	3.5	248	301	208	3.8	8	266	220	160	123	48	AK-Uni-029
200	248	310	194	4.3	248	331	220	4.5	8	290	250	200	158	50	AK-Uni-030
250	298	355	219	8.7	298	376	245	9.0	8	476	295	250	198	50	AK-Uni-031
315	398	395	244	12.0	398	436	281	12.5	8	567	345	315	248	48	AK-Uni-032
400	498	470	277	15.1	498	501	313	15.8	8	615	410	400	313	50	AK-Uni-033

RFD-R-K, RFD-R-D-K

Nominal size	RFD-R-K ØD₁ mm	RFD-R-K A_eff m²	RFD-R-K H₂ mm	RFD-R-K m kg	RFD-R-D-K ØD₁ mm	RFD-R-D-K A_eff m²	RFD-R-D-K H₂ mm	RFD-R-D-K m kg	ØD₂ mm	ØD mm	H₁ mm
125	158	0.0026	42	0.4	200	0.0034	67	0.5	120	123	8
160	197	0.0037	45	0.6	250	0.0060	70	1.0	155	158	8
200	241	0.0066	45	0.9	300	0.0092	70	1.3	195	198	8
250	295	0.0110	42	1.3	350	0.0150	67	1.8	245	248	8
315	364	0.0205	45	1.9	450	0.0265	80	2.8	310	313	8
400	450	0.0280	45	2.9	580	0.0355	80	4.1	395	398	8

RFD-R-US, RFD-R-D-US

Nominal size	RFD-R-US ØD₁ mm	RFD-R-US H₂ mm	RFD-R-US m kg	RFD-R-D-US ØD₁ mm	RFD-R-D-US H₂ mm	RFD-R-D-US m kg	ØD mm	H₁ mm	ØD₃ mm	C mm
125	158	120	0.5	200	153	0.6	98	8	127	40
160	197	125	0.8	250	158	1.1	123	8	162	40
200	241	128	1.1	300	161	1.5	158	8	202	40
250	295	133	1.6	350	166	2.1	198	8	252	40
315	364	140	2.3	450	183	3.2	248	8	318	40
400	450	150	3.4	580	193	4.6	313	8	403	40

RFD-R-UO, RFD-R-D-UD

Nominal size	RFD-R-UO ØD₁ mm	RFD-R-UO H₂ mm	RFD-R-UO m kg	RFD-R-D-UD ØD₁ mm	RFD-R-D-UD H₂ mm	RFD-R-D-UD m kg	ØD mm	H₁ mm	ØD₃ mm	C mm
125	158	146	0.6	200	192	0.7	98	8	127	40
160	197	151	0.8	250	196	1.2	123	8	162	40
200	241	154	1.2	300	197	1.7	158	8	202	40
250	295	159	1.6	350	202	2.2	198	8	252	40
315	364	166	2.5	450	219	3.6	248	8	318	40
400	450	176	3.7	580	229	5.3	313	8	403	40

RFD-R-A, RFD-R-D-A

Nominal size	RFD-R-A ØD₁ mm	RFD-R-A H₃ mm	RFD-R-A A mm	RFD-R-A m kg	RFD-R-D-A ØD₁ mm	RFD-R-D-A H₃ mm	RFD-R-D-A A mm	RFD-R-D-A m kg	H₁ mm	□Q₃ mm	H₄ mm	ØD₄ mm	ØD mm	C mm	Plenum box
125	158	255	170	2.8	200	284	204	2.9	8	216	195	125	98	50	AK-Uni-028
160	197	280	182	3.5	250	309	216	3.8	8	266	220	160	123	48	AK-Uni-029
200	241	310	194	4.2	300	339	228	4.6	8	290	250	200	158	50	AK-Uni-030
250	295	355	219	8.5	350	384	253	9.0	8	476	295	250	198	50	AK-Uni-031
315	364	395	244	11.6	450	444	289	12.5	8	567	345	315	248	48	AK-Uni-032
400	450	470	277	14.4	580	509	321	15.7	8	615	410	400	313	50	AK-Uni-033

RFD-R-D-N

Nominal size	ØD mm	B₁ mm	T₁ mm	H₃ mm	T₂ mm	A mm	C mm	G mm	m kg
125	98	283	304	152	264	77	50	159	2.4
160	123	335	333	177	293	90	48	155	3.8
200	158	392	413	212	373	108	50	195	5.1
250	198	435	456	262	416	132	50	195	6.5
315	248	496	516	312	476	157	48	230	10.0
400	313	728	692	377	652	190	50	305	15.0

Diffuser face RFD-Q

RFD-Q

Nominal size	RFD-Q-K □Q₁ mm	RFD-Q-K A_eff m²	RFD-Q-D-K □Q₁ mm	RFD-Q-D-K A_eff m²	ØD₂ mm
125	198	0.0026	198	0.0034	120
160	198	0.0037	248	0.0060	155
200	248	0.0066	248	0.0092	195
250	298	0.0110	298	0.0150	245
315	398	0.0205	398	0.0265	310
400	498	0.0280	498	0.0355	395

RFD-R

Nominal size	RFD-R-K ØD₁ mm	RFD-R-K A_eff m²	RFD-R-D-K ØD₁ mm	RFD-R-D-K A_eff m²	ØD₂ mm
125	158	0.0026	200	0.0034	120
160	197	0.0037	250	0.0060	155
200	241	0.0066	300	0.0092	195
250	295	0.0110	350	0.0150	245
315	364	0.0205	450	0.0265	310
400	450	0.0280	580	0.0355	395

Installation examples, Installation details, Commissioning, Basic information and nomenclature

Installation in continuous ceilings 00104475_0.

Flush ceiling installation

Installation and commissioning

Preferably for rooms with a clear height up to 4.0 m
Flush ceiling installation
RFD-*-D: Also for freely suspended installation
RFD-*-UO, RFD-*-UD: Clamping between ceiling tiles of up to 20 mm
Horizontal or vertical duct connection

These are only schematic diagrams to illustrate installation details.

Ceiling cut-out

Produktvariante	125 a mm	125 Ød mm	160 a mm	160 Ød mm	200 a mm	200 Ød mm	250 a mm	250 Ød mm	315 a mm	315 Ød mm	400 a mm	400 Ød mm
RFD-Q-K	180	140	235	175	295	215	370	265	465	330	595	415
RFD-Q-D-K	180	170	235	205	295	233	370	283	465	380	595	480
RFD-Q-A		140		175		215		265		330		415
RFD-Q-D-A		170		205		233		283		380		480
RFD-R-K	180	140	235	175	295	215	370	265	465	330	595	415
RFD-R-D-K	180	170	235	205	295	245	370	295	465	380	595	480
RFD-R-UO		125		160		200		250		315		400
RFD-R-D-UD		165		200		240		290		375		460
RFD-R-A		140		175		215		265		330		415
RFD-R-D-A		170		205		245		295		380		480

AK-Uni-...-MN Volume flow rate balancing

① Damper blade
② White cord for opening the damper blade

Open, 0°

Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

Ceiling diffusers with universal plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°
Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with two cords (white and green).

Volume flow rate measurement

Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.

Connect the measuring tube to the digital manometer
Read the effective pressure
Read the volume flow rate off the characteristic or calculate it
If necessary, adjust the damper blade position with the cords

A characteristic is included with each AK-Uni plenum box.

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Outer diameter of a circular diffuser face

ØD₂ [mm]

Diameter of a circular diffuser face style

ØD₃ [mm]

Diameter of a circular plenum box

□Q₁ [mm]

Outer diameter of a square diffuser face

□Q₂ [mm]

Dimensions of a square diffuser face style

□Q₃ [mm]

Dimensions of a square plenum box

H₁ [mm]

Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face

H₂ [mm]

Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot

H₃ [mm]

Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δt_z [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δp_t [Pa]

Total differential pressure

A_eff [m²]

Effective air discharge area

All sound power levels are based on 1 pW.

Downloads

product information

Product data sheet Type RFD

Product data sheet 7,2 MB pdf
Product data sheet Type RFD

Product data sheet 7,2 MB pdf
Type RFD Adjustment Data for AKV-RFD-ZHR Supply Air Diffusers

RFD_PD_2023_09_12_DE_en 140 KB pdf

certificates

Declaration of hygiene conformity Ceiling Swirl Diffusers Types FD, RFD, FDE

HC/FD/RFD/FDE/DE/en Declaration of hygiene conformity 140 KB pdf
Declaration of hygiene conformity Type RFD

RFD_HC_2024_05_DE_en Hygiene certificate 1,8 MB pdf
Environmental Product Declaration RFD

RFD_EPD_2024_03_DE_en Environmental Product Declarations 380 KB pdf
Non-CE Manufacturer's statement RFD

RFD_NotCE_2022_02_08_14_21_59_DE_en Certificate 1,8 MB pdf

operation manuals

Installation manual Ceiling diffusers

A00000054447 Installation manual 520 KB pdf
Installation manual Air terminal devices

IM_2018_06_A00000054447 Installation manual 1,2 MB pdf

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RFD

WITH LOW SOUND POWER LEVEL FOR COMFORT AND INDUSTRIAL ZONES, WITH FIXED AIR CONTROL BLADES

Application

Description

Technical information

Function, Technical data, Quick sizing, Specification text, ORDER CODE

Variants, Dimensions and weight, Product details

Installation examples, Installation details, Commissioning, Basic information and nomenclature

Downloads

product information

Product data sheet Type RFD

Product data sheet Type RFD

Type RFD Adjustment Data for AKV-RFD-ZHR Supply Air Diffusers

certificates

Declaration of hygiene conformity Ceiling Swirl Diffusers Types FD, RFD, FDE

Declaration of hygiene conformity Type RFD

Environmental Product Declaration RFD

Non-CE Manufacturer's statement RFD

operation manuals

Installation manual Ceiling diffusers

Installation manual Air terminal devices

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE