This Compatible Lasko THF15 Humidifier Wick Filter features an antimicrobial agent.  It has a patented rigid support for long-lasting design. 

 

Approximate dimensions: 7" x 8" x 1 3/4" 
 
For optimum performance, you should replace your Lasko Humidifier Wick Filter at the beginning of each season or every 2 months depending upon use.