L-50TB hatches, measuring 760 x 2440mm, are designed for access to a flat roof where a fixed stairway is being used and where frequent use may be expected. They permit easy movement of maintenance personnel, tools and equipment from a full size stairway.
They are manufactured with a thermally broken cover and frame provide a high degree of thermal efficiency and are supplied with 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.
A counterbalancing spring mechanism ensures that all hatches are easily operable by one person to assist designers and employees in meeting the requirements of the Manual Handling Regulations.