DESCRIPTION Aluminum double hung windows are windows have two operating sashes that can move up and down allowing for ventilation on top, bottom or both. Aluminum double hung windows are excellent choice for the rooms that face desks,walkways or porches, because the sash don’t open outward. With the tilt-in design, aluminum double hung windows can be cleaned from inside of the house.Product Information? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??Model NumberORAWDH1005MaterialAluminum profile, glass, ironmongeryColorStock color: white, grey and coffee brown. Any other RAL is available to be customized.SizeCustomizedGlassLess than 24mm thickness, single and double glazed available.IronmongeryKinglong or HOPO brandMosquito ScreenInsert screen made of aluminum profile with nylon or stainless steel mesh.Warranty10 yearsPackageBubble foam for container loading. Bubble foam+steel pallet for LCL loading.PaymentTT/Paypal/West UnionLeading time30-45 days based on your orderMOQ50sqm in totalWhat’s your aluminum window warranty? ORIDOW offers a 10 year warranty on the aluminum window frame, 10 years on glass and 5 years on parts.Durability of uPVC vs aluminium windows uPVC has been a popular choice for window frames since the 1980s. It’s a very durable material and resistant to rot, which means it has a?long lifespan and requires very little maintenance. However, frames can degrade over the years, albeit at a much slower rate than timber windows, and tend to require replacement after 20 to 30 years.Aluminium is also a highly durable material, but high quality aluminium windows can last up to 45 years because they don’t degrade in the same way that uPVC can. Unlike other metals, aluminium will not rust, so you don’t have to worry about your window frames sustaining unsightly patches of rust in the future.GLASS?We provide wide range of glass options. from the type, thickness to the layer and color.?The standard glasses we provide are Float glass, tempered glass, laminated glass, LowE glass, fire rated glass. All of these glass can make to different double glazed or triple glazed to meet your different energy requirement. Beside these, we also provide window grill options.What is Lowe glass??This is where low emissivity (or low-e glass) coatings come into play. Low-E glass has a microscopically thin, transparent coating—it is much thinner than a human hair—that reflects long-wave infrared energy (or heat). Some low-e's also reflect significant amounts of short-wave solar infrared energy.What is U value in heat transfer? Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. http://www.cnwindowsdoors.com/a...double-hung-windows.html