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      Technical Specifications

      Flexible Duct Sizing Guide

      MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      44 l/S Ø 150
      92 l/S Ø 200
      170 l/S Ø 250
      275 l/S Ø 300
      385 l/S Ø 350
      503 l/S Ø 400
      636 l/S Ø 450
      785 l/S Ø 500
      950 l/S Ø 550

      Streemline Diffuser Sizing

      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      SL2WS15 280×140 44 l/S Ø 150
      SL2WS20 280×140 92 l/S Ø 200
      SL2WL20 360×180 92 l/S Ø 200
      SL2WL25 360×180 170 l/S Ø 250
      SL2WL30 360×180 275 l/S Ø 300
      SL3020 280×280 92 l/S Ø 200
      SL3025 280×280 170 l/S Ø 250
      SL3030 280×280 275 l/S Ø 300
      SL4030 360×360 275 l/S Ø 300
      SL4035 360×360 385 l/S Ø 350
      SL4040 360×360 503 l/S Ø 400
      SL5440 540×360 503 l/S Ø 400
      SL5445 540×360 636 l/S Ø 450
      SL5450 540×360 785 l/S Ø 500
      SL5455 540×360 950 l/S Ø 550

      Silhouette Diffuser Sizing

      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      ST30 280×280 92 l/S Ø 200
      ST30 280×280 170 l/S Ø 250
      ST30 280×280 275 l/S Ø 300

      Linear Elite Diffuser Sizing

      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      LIN20 1200×100 92 l/S Ø 200
      LIN25 1200×100 170 l/S Ø 250

      Baby Linear Grille Diffuser Sizing

      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      BLIN20 560×83 92 l/S Ø 200
      BLIN25 560×83 150 l/S Ø 250

      Purtech Return Air Grille

      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      PUR9040 900×400 184 l/S 2 x Ø 200
      PUR9040 900×400 340 l/S 2 x Ø 250
      PUR9040 900×400 550 l/S 2 x Ø 300
      PUR9050 900×500 636 l/S 1 x Ø 450
      PUR9050 900×500 785 l/S 1 x Ø 500
      PUR9050 900×500 770 l/S 2 x Ø 350
      PUR9050 900×500 800 l/S 2 x Ø 400
      PUR7555 750×550 636 l/S 1 x Ø 450
      PUR1260 1200×600 770 l/S 2 x Ø 350
      PUR1260 1200×600 1006 l/S 2 x Ø 400
      MODEL NO. NOMINAL SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s) FLEXIBLE DUCT DIA (mm)
      HRAG 550×400 92 l/S Ø 200
      HRAG 550×400 170 l/S Ø 250
      HRAG 550×400 275 l/S Ø 300
      HRAG 550×400 385 l/S Ø 350

      Slimline Return Air Grille

      Door grille Sizing

      SIZE (mm) MAX RECOMMENDED AIR QUANTITY (l/s)
      600×150 120 l/s
      600×200 155 l/s
      600×250 190 l/s
      600×300 235 l/s
      600×350 275 l/s
      600×400 315 l/s
      600×450 350 l/s
      600×600 465 l/s

      Grille Sizing

      APPLICATION MAX RECOMMENDED VELOCITY (m/s)
      Return air grille at high level 1.75
      Return air grille at low level 1.50
      Return air grille for low noise level 1.25
      Wall registers 2.50
      Fresh air grilles 1.50
      Discharge louvres 1.50

      Conversions

      CONVERT TO MULTIPLE
      Litres per second(l/s) Cubic feet per minute(cfm) l/s X 2.119
      Cubic feet per minute(cfm) Litres per second (l/s) cfm X 0.4719
      Hp (refrigeration) Watts (refrigeration) Hp X 2.595(nominal)
      Ton (refrigeration) kW (refrigeration) Tons X 3.5168
      BTU/hr Watts (refrigeration) BTU/hr X 0.293
      Inches (in) Millimetres (mm) in X 25.4
      Square inches(sq in) Square millimetres (mm2) sq in X 645.16
      Square feet (sq ft) Square metres (m2) sq ft X 0.0929
      Inches water (in H2O) Pascals (Pa) in water X 249
      Pounds (lb) Kilograms (kg) lb X 0.45359