ORTO. Sound-attenuating transfer unit QUICK FACTS

Transcription

1 Sound-attenuating transfer unit QUICK FACTS Supplied in pairs For the transfer of air through a wall Fits in a rectangular wall opening Simple to install Designed for installation above a door Accessories: -- VGR telescopic wall sleeve Available in alternative colours AIR FLOW - PRESSURE DROP - R w VALUE Hole (mm) 10 Pa 15 Pa Pa R w =D n,we (db) l/s m 3 /h l/s m 3 /h l/s m 3 /h 0 0x x x x The data applies to installation in a 100 mm thick studded wall with a 10 m 2 transmission area. One transfer diffuser on each side of the wall.

2 Technical Description Design Sound attenuating transfer unit designed for installation in studded walls, produced as rectangular baffles containing insulating sound-absorbing material covered by a reinforced surface layer, rated to Fire Resistance Class B-s1,d0 conforming to EN ISO Open slot all around. The baffles are to be hung up on mounting frames supplied. Materials and surface treatment The baffles are made of sheet steel. The mounting frame is made of galvanised sheet steel. The baffles are painted in our standard white colour: RAL 9003/NCS S 0500-N. The transfer unit is also available in optional standard colours: RAL 7037 dusty grey, RAL 9006 white aluminium, RAL 9005 jet black, RAL 9007 grey aluminium and RAL 9010 white. Adaptation Other colours are available on enquiry. The front of the transfer unit can be provided with text, such as the company name. Please contact your nearest sales office for information. Accessories Wall sleeve: VGR. Rectangular telescopic wall sleeve made of galvanized sheet steel. Installation Cut the opening according to table 1. Secure the mounting frame with screws to the wall over the cut opening. Mount the baffles onto the mounting frame as illustrated in figure 1. If a wall sleeve is used, it can be secured to the mounting frame or the wall structure. Pull the wall sleeve apart or push it together to adjust it to the thickness of the relevant wall. Figure 1. Installation. 2 Swegon reserves the right to alter specifications

3 Project planning The diffuser is designed for installation in a studded walls with plasterboard covering. Concrete wall, or wall sleeve decreases the reduction index, see Table 1. Rule of thumb: R w - Transfer unit = Sound classification of the door + 5 db(a). Calculation of the wall structure's resulting R w value is shown in the example on the next page. Table 1 specifies reduction index D n,ew for transfer units, which refer to 10 m 2 transmission area. The measurements have been carried out according to ISO Technical. The R w = D n,ew value has been evaluated in relation to reference curve i ISO The tests have been carried out in a 100 mm thick studded wall with insulation Maintenance The baffles can be cleaned, if necessary, using lukewarm water and dishwashing detergent. Environment The Building Materials Declaration is available from www. swegon.com. 3. Figure 2. Application options. 1. Concealed installation towards a corridor. 2. Visible installation towards a corridor. Double. 3. As in (2), but with VG sleeve. Table 1 R w = D n,ew [db], 10 m 2 Cut opening in wall Double transfer One transfer unit (mm) units VGR in hole Concrete wall 0 0x Decreases -6 db Decreases -10 db x Decreases -6 db Decreases -10 db x Decreases -6 db Decreases -10 db x Decreases -6 db Decreases -10 db Double transfer units = One unit on each side of the wall. Standard delivery of double transfer units Swegon reserves the right to alter specifications. 3

4 Sizing To calculate the reduction index of the wall To calculate the total reduction index of a wall including door and transfer unit D n,ew = The R w value of the transfer unit referred to 10 m transmission area 2. = R w value of a wall without door and transfer unit, specified most often for 10 m 2. Calculate the difference between wall and door as well as transfer unit (10 m tranmission area 2 ). Difference: - D n,ew is obtained from Table 3. NOTE! First recalculate the door to 10 m 2. Example: Door + Transfer unit Wall, R w = 40 db, without door and transfer unit. Transfer unit, R w = D n,ew = 40 db. Door, R w = 35 db for 2 m 2 provides from Table 2 R w =D n,ew =35+7=42 db for the door for 10 m 2. Include the door in the calculation: -D n,ew = 40-42=-2 Table difference = -2 db decreases total value of the wall by 2. = 38 db with door. Include the transfer unit in the calculation: = 38 db -D n,ew = = -2 Table difference = -2 db decreases the new total value of the wall another 2 db. Wall, total value = 36 db with door + transfer unit. Change to another transmission area The specified D n,ew value of the transfer unit provides R w for a normalised transmission area of 10 m 2. Recalculation to other transmission areas: Table 2 Area (m 2 ) Correction (db) Example: Other transmission area Compare Swegon's transfer unit to a door which most often has a 2 m 2 transmission area. Door R w = 35 db for 2 m 2 Transfer unit D n,ew for 10 m 2 = 50 db Recalculate to 2 m 2 transmission area. The table provides the following: Transfer unit R w =D n,ew for 2 m 2 = 50-7 = 43 db Tip! the transfer unit to be 5 db better than the door since the R w value of the door will be the critical figure. Calculate using the formula: R tot = 10 x log Figure 3. Transfer unit above door, S = wall area. Table 3 ( ) S (10m 2 x x D n,ew ) + (S x x ) R tot = The total reduction index for wall with transfer unit or door. S = The wall area. D n,ew = The D n,ew value of the transfer unit = R w for 10 m 2 transmisson area. = The total R value for wall without transfer unit and door. S Difference: -D n,ew Decrease by: , , , Swegon reserves the right to alter specifications

5 Acoustic data The specified sound levels db(a) are applicable to a normally attenuated room with 10 m 2 equivalent sound absorption area and 4 db room attenuation. The db(c) value is normally 6-9 db higher than the db(a) value. Sizing diagram - One transfer unit - One transfer unit Sound power level L w (db) Table K OK p s Pa 0 Mid-frequency (octave band) Hz db(a) l/s m 3 /h - Double transfer units - Double transfer units Sound power level L w (db) Table K OK Mid-frequency (octave band) Hz p s Pa db(a) l/s m 3 /h Swegon reserves the right to alter specifications. 5

6 Dimensions and weights A Dimensions (mm) I Weight (kg) * , , , ,46 of opening, = I x 50. * Weight refers to 2 units. VGR Dimensions (mm) Weight F G H (kg) * , , , ,80 of opening, VGR = I x Ordering key Product Rectangular transfer unit a -bbb Version: : 0, 500, 700, 800 NOTE! Supplied in pairs. Accessories Rectangular wall sleeve: VGR a -bbb Version: Double 0: 500: 700: 800: VGR Specification text Example of a specification text according to VVS AMA. QMD Transfer unit Swegon's type rectangular sound attenuating transfer unit, with the following features: 1 A 50 Acoustic insulation with reinforced surface layer. Powder-painted and baked white finish, RAL 9003/NCS S 0500-N. : a - bbb xx items Accessories: Telescopic wall sleeve: VGRa - bbb xx items I Figure 4., dimensions. H G F Figure 5. VGR, dimensions. 6 Swegon reserves the right to alter specifications