Koch Filter 102 499 014 MULTI PLEAT XL11 SC 2" Standard Capacity MERV 11 Pleated Panel Filter Size 14x25x2 Multi Pleat Green 13 1" High Capacity MERV 13 Pleated Panel Filter This Dräger Tube is used for This Dräger Tube is used for the detection of hydrochloric acid and has the following standard measuring ranges: 500 5000 ppm 50 500 ppm Measurements: 10 Some filters utilize an activated carbon impregnated into the media to protect against nuisance levels of vapors and gases The dual layered construction of Multi Pleat Series XL11 overcomes a common problem found in single layered electrostatically charged filters Multi Pleat XL11