S-50TB are 915x760mm hatches designed to be used for personnel access where a fixed vertical ladder is being used. They offer easy one-hand operation to the fully open or close position, which provides the ladder user with the security of having one hand firmly on the ladder at all times.
They have a thermally broken cover and frame design, which improves thermal performance giving a high degree of thermal efficiency. They have 75mm of polyisocyanurate insulation to both the upstand and the cover.
In addition, the cover is fitted with a closed-cell EPDM gasket designed to reduce the air leakage though the closed cover, ensuring that the air leakage requirements of Building Regulations Part L are achieved.