LDR

Baffle silencer suitable for rectangular ducts

Easily-fitted
Effective
Built-in baffles
Universal flange

Duct connection, inlet [W x H]

LDR 100-50 Silencer#5067

Effective noise suppression

The LDR rectangular baffle silencer effectively suppresses noise transmitted to the duct.

Universal flange

The LDR rectangular baffle silencer is supplied with a universal flange that is suitable for both the PG flange and Metu profile.

Low air resistance

LDR is designed for low air resistance with baffle combinations that effectively dampens low-frequency noise.

The LDR is a baffle silencer with a rectangular design. It is designed for easy fitting immediately before or after components in rectangular ducts. It provides effective suppression of noise transmitted to the duct. LDR is designed for low air resistance with baffle combinations that dampen particularly low-frequency noise well. The silencer should be used together with an insulated fan where there is a requirement for noise suppression both in the duct and in the surroundings as a whole.

All silencers are supplied with a universal flange suitable for PG flange or Metu profile fitting. LDR is fitted with built-in baffles and side baffles located outside the fitting dimensions. It has an external shell of trapezoidal corrugated sheet for stability and reduced risk of natural oscillation. It features Lindtec as an insulation material that has been developed to provide good noise properties, low weight and to be cleanable.

Tech specs

Technical Data

Article name

LDR 100-50 Silencer

Article number

#5067

Default
Dimensions and weights
Duct dimension, inlet (height x width)	500 x 1,000	mm
Duct dimension, outlet (height x width)	500 x 1,000	mm
Weight	39	kg
Others
Duct connection type	Rectangular

Performance

.

Front area m2

P

LDR 30-15	0.045	3.5
LDR 40-20	0.08	3.6
LDR 50-25	0.125	3.7
LDR 50-30	0.15	3.3
LDR 50-40	0.2	3.0
LDR 60-30	0.18	3.3
LDR 60-35	0.21	3.0
LDR 70-40	0.28	3.1
LDR 80-50	0.40	3.6
LDR 100-50	0.50	3.6

Pressure drop calculation for rectangular silencers These calculations apply only if the silencer is connected to a duct at both ends. Example: Calculation of pressure drop for the LDR 60-35 (with dan model RSI 60-35 M3~) using the diagram to the right. 1. Start by defining the front area, see the table below. 2. Move horizontally to the right until you reach the designated air flow in diagram B. 3. Go up vertically to diagram A and the correct p value (see the table). 4. Then continue horizontally to the left and read off the pressure drop. In this example, the pressure drop is 27 Pa.

Acoustic

Noise suppression dB (mid-frequency Hz)

	125	250	500	1k	2k	4k	8k
LDR 30-15	7	15	18	25	25	19	19
LDR 40-20	5	9	15	23	16	12	10
LDR 50-25	10	15	25	25	20	15	12
LDR 50-30	8	15	20	31	17	14	11
LDR 60-30	8	15	20	31	17	14	11
LDR 60-35	7	13	17	18	13	10	8
LDR 70-30	9	8	10	13	9	8	9
LDR 70-40	7	11	14	14	10	8	6
LDR 80-50	6	8	10	11	8	6	3
LDR 100-50	6	8	10	11	8	6	3

Dimensions

	B	H
LDR 30-15	300	150
LDR 30-25	300	250
LDR 40-20	400	200
LDR 40-35	400	350
LDR 50-25	500	250
LDR 50-30	500	300
LDR 50-40	500	400
LDR 60-30	600	300
LDR 60-35	600	350
LDR 60-50	600	500
LDR 70-30	700	300
LDR 70-40	700	400
LDR 70-50	700	500
LDR 80-40	800	400
LDR 80-50	800	500
LDR 90-30	900	300
LDR 100-50	1000	500
LDR 110-30	1100	300
LDR 120-50	1200	500