View on LOZ Suggested Retail: $189.99. Comgrow 2 in 1 Hose Smoke Absorber,Strong Suction 3 Stage Purification for Soldering,Laser Engraver,Wood Burning Fume Extractor with 23 inch Adjustable Tube,15 inch Ventilation Aluminum Ducting. Super Strong 3 Stage purification-The Comgrow smoke absorber has a 3 stage filter.The first layer of high-density filter will initially trap large particles such as dust and debris,and the second layer of High Efficiency H18-Grade HEPA Filter remove at least 99.97% of particles with a size of 0.3 microns (um),the third layer Activated Carbon Filter remove VOCs,odor like cigarette smell. Adjustable knob At 0-30, the fan speed of the smoke purifier changes obviously, at 30, the fan speed has reached 6500 RPM.At 30-100, the fan speed of the smoke purifier is 6500±10% RPM, so the difference is not significant.We will change the knob afterwards to make the difference of speed regulation more.. 7 CALENDAR DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.