FilterBuy Humidifier Wick Replacement Filter for Lasko Humidifiers. Compares to Lasko Part # THF 8, THF-8, THF8. Lasko THF8 Humidifier Filter. Aftermarket replacement filter manufactured by AFB. Designed to fit Lasko Natural Cascade humidifier models 1128, 1129, and 9930. Dimensions: 8" x 11.5" x 1.5". Designed to last 2 months under normal use. Premium aftermarket replacement, designed by AFB in the USA. AirFilterBuy: Breathe Better!