Rytons 9x9 Cowled Acoustic AirLiner Set with Hit & Miss Ventilator

TAL9HMCWL - Rytons 9x9 Cowled Acoustic AirLiner Set with Hit & Miss Ventilator

Telescopic cavity liner set with external cowl for background room ventilation.
Allows the introduction of fresh outside air into the room to disperse moisture, odours and other airborne pollutants.
Use in noisy areas to reduce the amount of noise entering the building for a more peaceful environment.

External cowl protects against excessive weather conditions and alleviates air blasts through the cavity.
Telescopic cavity liner contains a system of internal baffles to reduce light and draughts.
Internal hit & miss grille manually adjusted with a sliding action allowing ventilation to be controlled as required.
Cowl, air brick and hit & miss grille U.V. stabilised to slow down the effects of sunlight.

External water baffles prevent transfer of water across the cavity.

 

 

Sound Reduction & Equivalent Area:

Sound reduced by 40 dB with internal grille fully open and 41 dB when closed (Dn,e,w) (tested by BRE Acoustics).
12,700mmý (127cmý) equivalent area (tested to BS EN 13141-1:2004 and independently verified by the BRE).

Size:

Cowl: 274mm L x 235mm H x 103mm D.
Acoustic AirLiner sleeve: 220mm W x 207mm H, extends from 250mm to 404mm L (including air brick) (see image gallery).
Hit & Miss grille: 271mm L x 247mm H.

Colours:

Terracotta: TAL9HMTCWL.
Buff/Sand: TAL9HMBCWL.
White: TAL9HMWCWL.
White hit & miss grille.

Composition:

Cowl and hit & miss grille: U.V. stabilised high impact polystyrene.
Multifix Air Brick: U.V. stabilised polypropylene.
Acoustic AirLiner: Polypropylene sleeve containing sound absorbent foam panels (contains recycled plastic).

Installation:

No special fixing required. Build in the cavity liner with fitted air brick as work proceeds. Extend the telescopic sleeve as necessary. Fasten the cowl to the brickwork. Fasten the hit & miss ventilator internally.
To comply with Building Regulations Part F the ventilator should be sited not less than 1.7m above floor level.

Handling Information:

Box quantity: 1 set.
Box size: 27.5cm W x 28.5cm H x 27cm D.
Box weight: 1.79kg.

Reference Material:

Measurement of airborne sound insulation was made in accordance with BS EN 20140-10: 1992.
Single number quantities were calculated in accordance with BS EN ISO 717-1:1997.
Equivalent area tested to BS EN 13141-1:2004 and independently verified by the BRE.
Also refer to: The Building Regulations 2000, Approved Document F,
The Building (Scotland) Regulations, Mandatory Standard 3.14,
The Building Regulations (Northern Ireland) 2000, Technical Booklet K,
British Standard BS 5250.

Questions & Answers:

Will installing more than one vent to achieve a greater free area have an effect on the acoustic performance? We asked the BRE who said ?The performance of the ventilator will not degrade when you put in more of them. The composite sound insulation performance of the facade will degrade if you increase the number of ventilators, assuming that they are one of the weaker links.?

Will the vent reduce sound from inside to outside as well as from outside to inside? The BRE has advised us that it's reasonable to assume that 'reciprocity' applies to the vents. That is, the third octave values for sound reduction index are the same in both directions (out to in and in to out).