*BLAST &IMPACT GRADE **IMPACTGRADE Some size restrictionsmay apply depending on hardware selected.O-OptionalS--Standardblank - N/A A=Estimated values and/or designationsB=Non-standard size or configurationC=Dual glazedD=1" Insulated - 1/4" clear,1/2" air,1/4" clearE=1" Insulated - 1/4" clear (Low Emissivity),1/2" air,1/4" clearF=1" Insulated - 1/4" clear (Low Emissivity),1/2" argon,1/4" clearG=1" Insulated - 1/4" clear,1/2" air,1/4" clear (Low Emissivity) *-Obscure GlassThickness**-Laminated Glass Thickness A-AvailableGlazing Option I-Internal BlindsCan Be Used WithThis Type of DualGlazingblank...