Flexit Air Handling Units - Elektra

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General Technical InformationDetermination of Sound Pressure (LpA) from the VentilationUnit on the Basis of Sound Power (LwA)10501Diagram 1dB-5-9-1023-15-2050 100 160 200 400 800 1600romvolum (m 3 )Explanation of curvesCurve 1. Technical rooms without specialsilencing. Typically boiler rooms or refrigeratingmachine rooms with good space and hard walland ceiling surfaces.Curve 2. Typically technical rooms where thetechnical installations take up a lot of space.Partially insulated ducts/pipes or silencedsurfaces.Curve 3. Very well silenced rooms. A lot ofinstallations (not much space), insulated ducts/pipes.Table 1 Correction for distanceDistance, m 2-3 4 5 6 8 10 12 15 20Distance silencing 0 -1 -2 -3 -4 -5 -6 -7 -8Table 2 Correction for locationLocation: - in the middle of the floor 0dB- along a wall +3dB- in a corner +6dBThe curves apply to a minimum distance of1.5-2.0 m. The diagram is based on a diffusesound field. In silenced rooms (curves 2 and 3),the sound field is not diffuse. We therefore getdistance silencing. Table 1 is used to correct fordistance. Table 2 corrects for the location of theunit.8
General Technical InformationExample:An air handling unit type <strong>Flexit</strong> S4 X, installed in astandard ventilation room.<strong>Air</strong> flow rate 260m 3 /hTotal pressure100PaSound power level in supply air duct 72dBAMotor power90WThe ventilation room is 8 x 5 x 4 = 160m 3 .The unit is located along one long wall. Thereference distance is 1m.This is a technical room without special silencingand therefore we use curve 1.If we look, in diagram 1, at the room volume,160m 3 , vertically up to curve 1, and from there tothe left axis, we can read –5dB.The calculation is shown below:Sound power level (LwA), from the capacity diagram for supply air72dBCorrection for radiated sound (LwA) from the correction factor table -29,1dBCorrection for room silencing from diagram 1Correction for distance, table 1Correction for location, table 2Sound pressure level at a 1 m distance (LpA)-5dB0dB+3dB40,9dBAPS: The calculation method is based on dBAvalues. You can also use it for octave bands.The method would then produce 1-2 dB for lowvalues in the range 63-125 Hz and 1-2 dB forhigh values in the range 2000-8000 H.Explanation of name codes:S 3 X E L 230 ECS = Cabinet model/VerticalL = Loft model/HorizontalNo. = Size= Fan type= Rated voltage230V/400VL = Left modelR = Right modelE = Electrically based heatingW = Water-based heating– = No heatingX = Cross heat exchangerR = Rotating exchangerExplanation of symbols used:SUPPLYAIREXTRACTAIREXHAUSTAIROUTDOORAIR9
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Page 10 and 11: General Product DescriptionProduct
Page 13 and 14: Flexit L4 XAccessoriesSummer Casset
Page 15: Flexit L4 XCapacity Diagram L4 X (m
Page 19 and 20: Flexit L7 XAccessoriesSummer Casset
Page 21 and 22: Flexit L7 XCapacity Diagram L7 X (m
Page 24 and 25: Flexit S3 RArt.no. Type14010 S3 REL
Page 26 and 27: Flexit S3 RSystem DrawingFI2M1B1EB1
Page 28 and 29: Flexit S3 RKArt.no. Type14012 S3 RK
Page 30 and 31: Flexit S3 RKSystem DrawingFI2M1B1EB
Page 34: Flexit S4 RSystem Drawing, water he
Page 39 and 40: Flexit SL4 RAccessoriesFilter SetAr
Page 41 and 42: Flexit SL4 RCapacity Diagram SL4 R
Page 46 and 47: Flexit S7 RSystem Drawing, water he
Page 48: Flexit S7 R ECCapacity Diagram S7 R

Flexit Air Handling Units - Elektra

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