4-Pack Replacement 1115 filter for Lasko - Compatible with Lasko 1115, Lasko THF15, Lasko L115 4-Pack Replacement 1115 filter for Lasko - Compatible with Lasko 1115, Lasko THF15, Lasko L115 Replaces Lasko THF8 Humidifer Filter Traps Water Impurities & Dissolved Solids Before They Become Airborne For best results, change air filter at least once per season or more often depending on air quality and use. Essential for Allergy Sufferers. On Sale for a Limited Time!