AEARO CORPORATION CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES (DOLLARS IN THOUSANDS) (UNAUDITED) Year Ended September 30, 1999 2000 2001 2002 2003 -------- -------- -------- ------- ------- Earnings: Pre tax income (loss) from continuing operations $ 10,297 $ 12,624 $ (3,752) $ 11,104 $ 23,159 Fixed Charges .................................. 26,152 26,497 25,757 22,648 21,692 -------- -------- -------- -------- -------- Earnings as defined ............................ $ 36,449 $ 39,121 $ 22,005 $ 33,752 $ 44,851 -------- -------- -------- -------- -------- Fixed Charge: Interest Expense, net .......................... $ 24,322 $ 24,387 $ 23,666 $ 20,055 $ 19,587 Interest component of operating lease .......... 1,830 2,110 2,091 2,593 2,105 -------- -------- -------- -------- -------- Fixed charges as defined ....................... $ 26,152 $ 26,497 $ 25,757 $ 22,648 $ 21,692 -------- -------- -------- -------- -------- Ratio of Earnings to Fixed Charges ............. 1.4 1.5 0.9 1.5 2.1 ======== ======== ======== ======== ======== Note: Ratio of earnings to fixed charges is defined pre-tax income from continuing operations plus fixed charges divided by fixed charges. Fixed charges include interest (including amortization of debt issuance costs) and a portion of rental expense assumed to represent interest. Earnings for the year ended September 30, 2001was insufficient to cover fixed charges by $3.8 million.