Windows • Curtain Walls • Entrances • Storefronts Series 672 Double Hung • Series 6620 Fixed 3 7⁄8" Architectural Grade Double Hung Thermal Window Double Hung • Fixed The Series 672 double hung window retains an AAMA Architectural Grade rating and is a proven performer in projects ranging from historical replication to new construction. The upper sash meeting rail is thermally improved using a two-part high density polyurethane. All remaining members are thermally enhanced with E-Strut™ thermal isolators. Offered with a complete line of sub frames, mullions and architectural sills, this product family provides the complete solution for fenestration needs. E-StrutTM thermal isolator Improves U-Factor performance Dual finish capability Completely eliminates dry shrinkage Continuous interlock meeting rails Improves air infiltration resistance Dual glazing Improved energy savings Weather-stripped sash and sill Provides superior air and water performance Automatic top and bottom sash locks available Increased convenience Trim-All™ panning available Allows matching of existing sight lines in restoration projects Screen frames of extruded aluminum alloy are available Stronger, more durable screens Accessory line of subframes, mullions, and architectural sills Allows custom designs with standard product Anodized or painted finishes available Multiple options to answer economic and aesthetic concerns © Copyright 2015 EFCO Corporation 05/15

Series 672 Double Hung • Series 6620 Fixed 3 7⁄8" Architectural Grade Double Hung Thermal Window Frame Construction Sash Frame Construction Note: All performance value data is based on laboratory testing per AAMA 101/I.S.2/ A440 for Air/Water/Structural, ASTM E90 and or E413 for Acoustical, AAMA 507 and or NFRC 100/200/500 for UFactors and AAMA 1503 for Condensation Resistance Factor (CRF). Printed values are subject to change pending the frequency of recertification testing. Field results will vary depending on size, the field test method, the addition of sub-frames, panning, mullions, accessories...

Windows • Curtain Walls • Entrances • Storefronts Series 672 Double Hung • Series 6620 Fixed 3 7⁄8" Architectural Grade Double Hung Thermal Window Main Frame Construction The frames have a depth of 3 7/8" and are constructed of 6063-T6 aluminum alloy. The nominal material wall thickness for the frame is .080", and the sill has a minimum wall thickness of .094". Corners are of screw spline construction and sealed. See Illustration 1. Sash Frame Construction The sash consists of aluminum members with .080" nominal material wall thickness of 6063-T6 alloy. Corners are of screw spline construction...