class A

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class A, B, C, D, E, F

A classification applied to fire doors, fire windows, roof coverings, interior finishes, places of assembly, etc., to indicate gradations of fire safety. See fire-endurance, fire-door rating.
References in periodicals archive ?
Shipments of Class C units are down about 9 percent through May, but Class A shipments are down 39 percent, according to the Recreational Vehicle Industry Association.
In the early `90s, skill-based errors were a factor in about 40 percent of all TACAIR and helo Class A's.
Although cash flow has declined and the loan terms have been modified, the affirmations reflect class A's senior position in the capital stack as well as the significant reserves that can be used to reduce the outstanding debt.
The second was in B-1Bs deployed to Moron Air Base, Spain, making multiple inert bomb runs on a range made infamous by F-4, F-111, and F-16 Class A's with resident, pterodactyl-size condors.
Monterrey Fitch Ratings has affirmed the 'CCsf' and 'D(mex)' ratings of Su Casita Trust's class A and B residential mortgage backed securities (RMBS), respectively.