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	NP Download  Catalog  Submittal Sheet (Inch / Metric)  Performance Data (Inch / Metric)  High Resolution Picture
The model NP is similar to the NT, the difference being the lack of air direction control. In an application where a flooding or dumping of conditioned air is required without the need to control it, the NP essentially functions as a finish piece for the system, whether used in exposed ductwork or surface mounted.* *Note: NT & NP are designed for wall mounting. Screws must be used for ceiling mounting. Material  Heavy-Gauge Anodized Aluminum Finish  Anodized (Custom Colors Available) Sizes  4" 6" 8" 10" 12" 14" 16" 20" 24" Features  Anodized Aluminum Body  Long Throw Capability  High Airflow Capacity  Available For Standard Ducts Related Product: BS Butterfly Damper >>
Model NP Dimensions (PDF Version) MODEL DUCT SIZE A B C D E NP 4 4" 4 3/4 3 5/8 5/8 2 1/2 NP 6 6" 7 3/16 5 17/32 7/8 3 11/12 11/16 NP 8 8" 9 13/32 7 17/32 1 4 1/4 3/4 NP 10 10" 11 7/8 9 1/2 1 1/4 5 1/16 15/16 NP 12 12" 14 11/32 11 15/32 1 1/2 4 7/8 1 1/8 NP 14 14" 16 5/8 13 7/16 1 21/32 4 3/4 1 7/32 NP 16 16" 18 25/32 15 13/32 1 3/4 4 11/16 1 5/16 NP 20 20" 23 7/16 19 9/16 2 6 1/2 1 1/2 NP 24 24" 27 7/16 23 9/16 2 6 1/2 1 1/2 Dimensions are in inches. Product information is Subject to Change Without Notice
Performance Data (PDF Version) SIZE Neck Velocity (fpm) 250 500 750 1000 1250 1500 Velocity Pressure (in., wg) 0.004 0.016 0.035 0.062 0.097 0.140 Total Pressure 0.023 0.058 0.115 0.167 0.257 0.333 4 Neck Area 0.062 sq.ft. CFM 20 40 50 70 80 100 NC - - - - 15 16 Throw (ft.) 9 11 15 17 18 20 6 Neck Area 0.144 sq.ft. CFM 40 80 110 150 180 220 NC - - - - 15 16 Throw (ft.) 12 16 20 22 24 27 8 Neck Area 0.27 sq.ft. CFM 70 140 210 270 340 410 NC - - - - 15 16 Throw (ft.) 12 19 23 26 29 33 10 Neck Area 0.43 sq.ft. CFM 110 220 330 430 540 650 NC - - - - 15 16 Throw (ft.) 13 21 25 29 33 36 12 Neck Area 0.632 sq.ft. CFM 160 320 480 640 790 950 NC - - - - 15 16 Throw (ft.) 15 23 28 31 35 40 14 Neck Area 0.86 sq.ft. CFM 220 430 650 860 1080 1290 NC - - - - 15 16 Throw (ft.) 16 23 29 33 38 45 16 Neck Area 1.156 sq.ft. CFM 290 580 870 1160 1450 1740 NC - - - - 14 16 Throw (ft.) 16 23 28 34 37 42 20 Neck Area 1.88 sq.ft. CFM 470 940 1410 1880 2350 2820 NC - - - - 15 16 Throw (ft.) 17 23 27 33 36 42 24 Neck Area 2.7 sq.ft. CFM 680 1350 2030 2700 3380 4050 NC - - - - 15 16 Throw (ft.) 17 22 28 33 36 44 THE THROW VALUES ARE BASED ON A 50 FPM TERMINAL VELOCITY. DASHED LINE IN SP BOX INDICATES STATIC PRESSURE IS LESS THAN 0.01 IN.W.G. DASHED LINE IN NC BOX INDICATES NOISE LEVEL IS LESS THAN 20. NC LEVEL IS BASED ON 10dB ROOM ATTENUATION(PWL RE:10-12 WATTS) WITH ONE DIFFUSER OPERATING. *Seiho International reserves the right to make changes without prior notice. *This performance data is proprietary to Seiho International, Inc., and shall not be used except as expressly authorized by the company.

Home > Products > BS
	BS Download  Catalog  Submittal Sheet (Inch / Metric)  High Resolution Picture
Model BS damper with multiple blades is designed for air volume control for round ducts. Continuously adjustable from the face with a screwdriver for quick and easy volume control just by twisting until the desired setting is reached. The multiple blades provide more precise control. All-steel construction for durability. Material  Heavy-Gauge Steel Finish  Black Sizes  6" 8" 10" 12" 14" 16" 20" 24" *Note: Not for use with flexible ducts.
Model BS Dimensions (PDF Version) MODEL DUCT SIZE A B C BS 6 6" 5 11/16 22/32 22/32 BS 8 8" 7 21/32 3/32 22/32 BS 10 10" 9 5/8 19/32 22/32 BS 12 12" 11 5/8 1 1/16 22/32 BS 14 14" 13 5/8 1 9/16 22/32 BS 16 16" 15 9/16 2 1/32 22/32 BS 20 20" 19 1/2 3 1/32 22/32 BS 24 24" 23 7/16 4 1/32 22/32 Dimensions are in inches. Product information is Subject to Change Without Notice