The hurricane rated construction option was engineered so that the fans have the same physical size as the standard construction units. In addition, the fan's air and sound performance, as shown in the product catalogs and Compute A Fan® selection software, remains identical to the standard construction products. Approved attachment details are included in the Notice of Acceptance documents on the Miami-Dade County Florida web site () and the Florida Building Commission web site (). These details are also available in LOREN COOK COMPANY 's Installation, Operation and Maintenance manual "Hurricane Rated Construction" Supplement. The approved attachment details do not require the use of external tie downs to the roof. Installation of the fans to an approved roof curb must be in accordance with these details to meet the Miami-Dade County and Florida Building Commission approvals.