D.S Industry Co., Ltd

BEST

Nozzle Diffuser

Product Type	Product Code
Square Round Nozzle Diffuser	ND Φd1

Product Features

Characteristics of Diffused Airflow	Spot blow, Excellent air volume and reach distance.
Air Volume Control	Air volume control handle
Structure	The ratio of the inlet and outlet area is large Air resistance can be minimized
Installation	Lobby with high ceiling, large banquet hall, etc.
Interior	Since it can be harmonized with a light fixture in a structure that uses a lot of ceiling downlights, it is also widely used in an architectural dimension.

Product Material & Finish

Cold rolled steel sheet
Aluminum

Powder coating
Powder coating

Product Dimension

PRODUCT TYPE

SR TYPE (square round)

> A(Φ,mm)

Product Code	Neck Diameter	Height B(mm)	Height C(mm)	Face D(Φ,mm)	Ceiling E(Φ,mm)
ND 100	95	63	34	150	104
ND 125	120	63	34	175	129
ND 150	145	63	34	200	154
ND 200	195	63	34	250	204
ND 250	245	63	34	200	254
ND 300	295	63	34	350	304

※ For the products other than the above specifications, please contact us.

Reach Distance and Angle of Diffused Airflow

Reach Distance of Airflow

NOZZLE DIFFUSER is generally attached to the wall or ceiling. The minimum reach distance is measured (Lmin) at the location where
the central wind velocity of the airflow is 0.5m/s. The location of the residual air velocity of 0.1m/s is L (reference value).

Horizontal diffusion on the wall

The center of the airflow (the distance between the maximum wind velocity the maximum temperature) in any case of the same temperature as room temperature or hot and cold air in the horizontal diffusion shows approximately the same value.

Vertical diffusion on the ceiling

During vertical diffusion, the airflow is subjected to buoyancy, so it is short in the case of warm air diffusion and long in the case of cold air diffusion. In the case of cold/warm air diffusion, when the difference between the temperature difference in the room is 10℃, the distance between horizontal and vertical diffusion varies by ±25%.

Diffusion Range

For the airflow diffusion, the location at which the central wind velocity of diffused air flow is 0.5m/s is the minimum diffusion range (Rmin diffusion angle 15°), and the location at 0.25m/s is the maximum diffusion range (Rmax, diffusion angle 20°). The diffusion angle shows almost the same value regardless of the diameter of the outlet.

Reach Distance Correction Factor

The reach distance during the diffusion of hot and cold air is calculated by multiplying the reach distance in the performance table by a correction factor.

Diffusion Direction	Diffused Airflow	Airflow's residual wind velocity(m/s)	Correction Factor
Horizontal diffusion	Cold air	0.5	1.0
	Warm air	0.25	1.25
	Isothermal air	0.1	1.4
Vertical Diffusion	Cold air	0.5	1.0
		0.25	1.25
		0.1	1.4
	Warm air	0.5	1.0
		0.25	1.1
		0.1	1.15
	Isothermal air	0.5	1.0
		0.25	1.2
		0.1	1.3

Performance Data

Nozzle diffuser
Product Code	Neck wind velocity (m/s)	2	4	6	8	10	12	14	16	18	20
Product Code	Static pressure loss (mmAq)	0.4	1.4	3.0	5.3	8.3	12.0	16.0	21.0	27.0	33.0
ND 150	Air volume (CMH)	130	260	390	520	665	785	915	1045	1175	1305
	Reach distance (m)*1 (H.V)	1.4-2.7	2.7-5.5	4.1-8.2	5.5-10.9	7.6-15.2	9.1-18.2	10.6-21.3	12.2-24.3	13.7-27.4	15.2-30.4
	Drop distance (m)*2 (H)	0.1-1.0	0.3-2.1	0.4-3.1	0.5-4.1	0.8-6.3	0.9-7.6	1.1-8.9	1.3-10.1	1.4-11.4	1.6-12.7
	Noise level (db)*3	-	-	-	-	-	25	28	31	34	38
ND 200	Air volume (CMH)	225	450	680	905	1130	1355	1580	1810	2035	2260
	Reach distance (m)*1 (H.V)	1.8-3.6	3.6-7.2	5.4-10.8	7.2-14.4	10.0-20.0	12.0-24.0	14.0-28.0	16.0-32.0	18.0-36.0	20.0-40.0
	Drop distance (m)*2 (H)	0.2-1.8	0.4-3.6	0.7-5.3	0.9-7.1	1.4-11.0	1.6-13.2	1.9-	2.2-	2.5-	2.7-
	Noise level (db)*3	-	-	-	22	28	32	35	38	42	45
ND 250	Air volume (CMH)	335	705	1060	1415	1765	2470	2825	3180	3530
	Reach distance (m)*1 (H.V)	2.3-4.5	4.5-9.0	6.8-13.5	9.0-18.0	12.5-25.0	15.0-30.0	17.5-35.0	20.0-40.0	22.5-45.0	25.0-50.0
	Drop distance (m)*2 (H)	0.4-2.8	0.7-5.6	1.1-8.3	1.4-11.1	2.1-	2.6-	3.0-	3.9-	3.9-	4.3-
	Noise level (db)*3	-	-	-	23	29	33	36	39	43	46
ND 300	Air volume (CMH)	510	1015	1525	2035	2545	3050	3560	4070	4575	5085
	Reach distance (m)*1 (H.V)	2.7-5.4	5.4-10.8	8.1-16.2	10.8-21.6	15.0-30.0	18.0-36.0	21.0-42.0	24.0-48.0	27.0-54.0	30.0-60.0
	Drop distance (m)*2 (H)	0.5-4.0	1.0-8.0	1.5-12.0	2.0-	3.1-	3.7-	4.3-	4.9-	5.6-	6.2-
	Noise level (db)*3	-	-	-	24	30	34	37	41	45	48

*1 The residual wind velocity of the airflow among the reached distance is 1.0 m/s, 0.5 m/s. In the case of vertical diffusion,
the diffusion temperature difference is 10℃, the reach distance is increased by 25% during cooling and decreased by 25% during heating.

*2 The difference in diffusion temperature is 10℃

*3 Outlet noise level-Indoor diffusion attenuation (8db)

PRODUCT