10/02/2026
One Photo Guide to Aluminum Thermal Break Windows
📸 Learn the structure of a thermal break aluminum window at a glance
1️⃣ Outer Frame
Fixed to the wall, supports the entire window structure, strong and thermally efficient.
2️⃣ Inner Sash
The operable part, holds glass or fly screen, with sealing strips for airtight and watertight performance.
3️⃣ Mullion / Middle Beam
Divides large glass areas, adds structural strength.
4️⃣ Insulated Glass / Glazing
Usually double-layered, provides sound insulation and thermal efficiency.
5️⃣ Sealing Strip / Gasket
Prevents air and water leakage, enhances sealing; usually EPDM or silicone.
6️⃣ Concealed Hinge
Hidden in the profile, allows wide opening, looks neat and safe.
7️⃣ Multi-point Lock System
Secures the sash at multiple points for better security and tight sealing.
8️⃣ Thermal Break Strip
Nylon strip inside the aluminum, blocks heat transfer — the core of “thermal break” technology.
9️⃣ Fly Screen / Mosquito Sash
Removable or built-in, allows ventilation while keeping insects out.
🔟 Drainage Hole
Removes water from the frame, prevents leaks.
1️⃣1️⃣ Wood Grain Film Coating
Decorative layer with wood texture, anti-corrosion and aesthetic.
1️⃣2️⃣ Handle / Operating Lever
Controls window opening/closing, usually paired with multi-point lock.
