Construction: Outer Mild Steel Powder coated and Inner Stainless Steel or Fully Stainless Steel. Main HEPA Filter Size - 610 x 450 x 75, 915 x 450 x 75, 1220 x 450 x 75, 1830 x 450 x 75 mm HEPA (0.3 Micron)- 1 No Pre Filter Size â?? 600 x 120 x 50, 900 x 120 x 50, 1200 x 120 x 50, 1800 x 120 x 50 mm (10 Micron)- 1 No Exhaust HEPA Filter- 610 x 450 x 75, 915 x 450 x 75, 1220 x 450 x 75, 1830 x 450 x 75 mm HEPA (0.3 Micron)- 1 No Door- 5mm, Poly Carbonate Door Gas Supply- Gas cock Switch- 3 Pin Socket â?? 1 No (230V/20A) Noise Level- 65 +/- 5 db Power Supply- 230v AC, 50Hz Light- 20 /40 W LED Fitting- 1 No UV Light- 15/30 W â?? 1 No Pressure Gauge - Yes Duct- Your Scope (6 inch Dia)