Type S and Type NB steel and aluminum roof hatches from the Bilco Co. are designed to conform to high-velocity hurricane zone standards. The hatches, which have been certified by Miami-Dade County’s Building Code Compliance Office, have fully welded corners on both the curb and cover with heavy-duty slam latches to ensure the covers stay closed in extreme weather conditions. The Type S roof hatch (shown), available in galvanized steel or aluminum, measures 36" by 30". Type NB, which comes in galvanized steel, aluminum, or stainless steel, is 30" by 54". Both feature one-handed operation. bilco.com