American Casement Window Foldable crank handle aluminum clad solid oak wood

Doorwin is dedicated to the pursuit of energy efficient, eco-friendly and cost-effective products and through our research and development have made great strides in the performance categories of thermal-insulation, structural strength, weatherproofing, sound-insulation, and condensation resistance. Our products are designed to exceed North American NFRC code requirements. Independent testing by Intertek USA confirms that our products perform exceptionally well in all climate zones.