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NTSD: Anti-Drop™ Double Deflection Grille

The Anti-Drop™ Double Deflection Grille (velvet double blade) comes with a standard or separate airflow control valve (OBD). Unlike the NTSE single blade, it features two layers of unidirectional blades that can be independently adjusted to control the vertical and horizontal airflow direction, while the airflow control valve provides airflow volume control. NTSD is ideal for commercial, residential, restaurant, parking lot, and restroom applications. For a double-blade appearance and removal of the inner liner, customers can choose the hinged design (NTSBSD). BS:476 PART 6 & 7 CLASS 0 Fire Rating (with FSD Fire Safety Certificate)

Standard Construction

  • Minimum Size: 100 mm * 100 mm
  • Maximum Size (single piece): 1220 mm * 1220 mm
  • Oversized construction available with muillions and/or duct channels
  • Total Height: 50mm (with damper=100mm)

Construction Options

  • Short leaves in front, long leaves behind (NTSD-V) (Figure 1)
  • Longer leaves in front, shorter leaves behind (NTSD-H) (Figures 2 and 4)
  • Opposed Blade Damper (+D)
  • Filter frame (+FF)
  • Insect screen (+IS)
  • Square to round adaptor (+SR)

How to order

  • Example: Matte white aluminum double-leaf headlight - 25mm edge - longer leaf in front - OBD included - face measurement 800*300
  • Code: ASD-H/25/+D/BASE/800*300/Matt White
32 mm Frame (32 sides)
25 mm Frame (25 sides)
20 mm Frame (20 sides)
Other frame sizes (contact us)

FRAME

No additional accessories required
Opposed Blade Damper (O.B.D.)
Filter Frame (+FF)
Insect Screen (+IS)
Square to Round Adaptor (+SR)

ACCESSORIES

Short leaves in front (NTSD-V)
Longer leaves in front (NTSD-H)

BLADE POSITION (RECTANGULAR)

Border Calculation Formula

    border Neck Tianhua left a roar Wind throat Neck height
    20mm B-24mm B-14mm B-19mm 50mm
    25mm B-36mm B-26mm B-31mm 50mm
    32mm B-50mm B-40mm B-45mm 50mm
    • B = Base Size (Meter)
    • Assuming a 25mm edge is chosen, the face value is 300mm.
    • Neck gauge = 264mm
    • The ceiling height is 274mm.
    • Air vent hole = 269mm

Other borders/methods

    • A frame thickness of less than 20mm is not recommended.
    • Narrower bezels will have less impact on appearance and rigidity, thus reducing the risk of installation distortion.
    • Narrower frames require more precise ceiling openings.

Frequently Asked Questions

    • Can the neck be thinned?
    • No, the neck depth of double-leafed plants must be at least 50mm. If it is less than 50mm, consider using single-leafed plants (ASE), which only need to be 25~32mm.

If you need any assistance, you can consult our 24-hour online text customer service / customer service mailbox , and we will provide you with service at any time.

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