Fits the following products:
HP400BLS
HP400BLB
HP400WHS
HP400WHGR
 
Product Dimensions:
HEPA: 6.26 X 6.89 inches 
Pre-Filter: 19.68 X 6.89 X 0.12 inches
Shipping Dimensions - 6.50 x 6.50 x 7.30 inches
Shipping Weight - 0.79 pounds
 
Recommended Filter Change:
HEPA: 6 months
Pre-Filter: 3 months