Description

Double Pane Single Hung Window Features

Mannlee’s double pane single hung windows combine ​energy efficiency with ​emergency-ready functionality, designed for basement egress and cost-conscious safety compliance. Featuring 0.5″ laminated glass panes (6mm outer + 4mm inner) and argon-filled cavities, these units deliver:

​Emergency compliance – 20″×24″ clear opening exceeds IRC 2023 egress requirements
​Thermal superiority – U-factor 0.28 outperforms single-pane windows by 58%
​Security reinforcement – 2.5mm tempered glass withstands 200 PSF impacts (ASTM E1886 certified)

Technical innovations include:
​Triple weatherstripping – Silicone/EPDM hybrid seals achieve <0.08 CFM air leakage
​Tilt-out cleaning – Bottom sash tilts 45° for interior glass maintenance
​UV-resistant frames – 50-year vinyl warranties against warping/fading

Benefits of Double Pane Single Hung Windows

1. Code-Compliant Safety
​Fast egress – 5-second sash removal mechanism meets NFPA 101 emergency standards
​Child-safe design – Restricted 4″ opening prevents falls (ASTM F2090 compliant)

2. Energy Savings
​**$462/year savings** – ENERGY STAR® Most Efficient 2025 designation reduces HVAC costs
​Condensation control – Thermal spacer maintains <35% RH at glass surface

3. Cost Efficiency
​30% lower cost – Simplified single-sash mechanism vs double-hung alternatives
​Low maintenance – 1 moving part reduces repair frequency by 67%

4. Security Enhancement
​Forced entry resistance – Multi-point locking withstands 250lb impacts
​Shatter protection – Laminated interlayer holds glass fragments if broken

5. Space Optimization
​Compact operation – Vertical sliding requires only 6″ clearance vs casement windows
​Basement adaptation – Fits 36″ window wells with 90° outward swing clearance