Pre-Motor Pleated Style Filter installed inside of the dust cup. 

For the following models:

Eureka Bagless Upright Vacuums (Litespeed Whirlwind 5700/5740/5800 series including 5740A, 5840A, 5840AV, 5841A, 5841AS, 5841AV, 5841BV, 5842AV, 5843AV, 5843AZ, 5844AV, 5844AZ, 5845A, 5846AH, 5847AV, 5847AZ, 5847BV, 5848AV, 5849A, 5850AZ, 5851AV, 5852AV, 5853A, 5855AZ, 5856AV, 5857AZ, 5890, 5892AZ), Sanitaire SC5845A, SC5815