Dictionary
Styles
Pritzker
RIBA
References
CAD Scale Factors
AIA Numbering System
CMU Block Sizes
Dictionary
Styles
Pritzker
RIBA
CAD Scale Factors
AIA Numbering System
CMU Block Sizes
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class "A"
Optimum fire rating issued by Underwriter's Laboratories on roofing. The building codes in some areas require this type of roofing for fire safety.
First 10 image search results of class "A" architecture