Nap Acoustics - The experts in noise control

NAP ACOUSTICS SOUTH EAST ASIA PTE LTD
DESIGNERS & MANUFACTURERS OF NOISE AND VIBRATION CONTROL PRODUCTS

NAP 'Airvent' Cross-Talk Silencers

Introduction

The NAP Acoustics 'AIRVENT' range of cross-talk silencers has been specially designed to solve the common problem of transferring air from adjacent areas without transferring unwanted noise. These silencers allow two-way airflow whilst efficiently reducing the transfer of sound in either direction. They are particularly effective in the all-important speech frequency range which often causes speech privacy problems in the work environment.

A comprehensive range of models of various configurations allows great flexibility in the choice of silencer location. Versatility and ease of installation result in economical noise control.

As with all NAP Acoustics products, attention to detail and quality of construction are evident throughout the 'AIRVENT' range. Product reliability has established NAP Acoustics' reputation, proven performance and market leadership.

Typical Applications

Offices, Schools, Laboratories, Hospitals, Conference Rooms, Hotels, Factories, Libraries, Music Rooms, Studios, Sporting Complexes, Kitchens, Apartments, Rest Rooms, Return Air Shafts.

Silencer Types

I Configuration Unit Designation I - ST - W/H Model - Type - Grille Width / Grille Height Overall length = L		U Configuration Unit Designation U - ST - W/H Model - Type - Grille Width / Grille Height Overall length = L + 2H
L Configuration Unit Designation L - ST - W/H Model - Type - Grille Width / Grille Height Overall length = L + H		Z Configuration Unit Designation Z - ST - W/H Model - Type - Grille Width / Grille Height Overall length = L + 2H

Acoustic Performance

The published performance data is based on results obtained from laboratory tests carried out at an independent NATA registered laboratory and tested to BS 2750 : 1980 "Field and Laboratory Measurements of Airborne and Impact Sound Transmission in Buildings".

* For ST - Type, L = 900mm. For HP-Type, L = 1500mm.

Octave Band Centre Frequency (Hz)
Model	63	125	250	500	1k	2k	4k	8k
I-ST	23	25	24	25	24	32	40	35
I-HP	22	28	31	33	34	34	39	39

Octave Band Centre Frequency (Hz)
Model	63	125	250	500	1k	2k	4k	8k
Z-ST	23	25	24	31	40	42	46	41
Z-HP	22	28	31	39	44	44	45	45

Octave Band Centre Frequency (Hz)
Model	63	125	250	500	1k	2k	4k	8k
L-ST	23	25	24	28	32	37	43	38
L-HP	22	28	31	36	37	38	42	42

Octave Band Centre Frequency (Hz)
Model	63	125	250	500	1k	2k	4k	8k
U-ST	23	25	24	31	40	42	46	41
U-HP	22	28	31	39	44	44	45	45

Pressure Drop

Installation

NAP 'AIRVENT' silencers may be installed in ceilings, walls and shafts in a fully concealed, flush or exposed configuration suitable for standard partitioning systems or ceiling grids.

In order to ensure 'AIRVENT' silencers achieve their maximum performance potential, careful attention should be given to the location and installation details. Typical installations are shown below.

All penetrations through walls and ceilings should be properly sealed once the unit has been installed to prevent flanking noise and breakout.