This version of the fire-rated rectangular drop-down door from Manthorpe is supplied with a cam lock (as opposed to the budget lock with T key) for boosted security as well as unbeatable fire protection. Externally certified by Chiltern International Fire Ltd. for its one-hour fire rating, this robust design is manufactured in powder-coated mild steel with a lightly textured finish that can be both cleaned and painted with ease. Meeting British Standards&apos; regulations for a leakage rate of <1m³ (at a pressure differential of 2 Pa), this rectangular loft access door is designed with built-in draught seals at all four sides and a secure latch, ensuring no moist, warm air can get into the loft space and cause damage to stored items or the roof&apos;s structure. The door comes with mineral wool insulation that offers a uValue of 0.35 W/m²K for optimum energy efficiency. Manthorpe Lockable Fire Rated Loft Door Specification Frame fitting size: 726mm x 562mmOpening size: 665mm x 521mmVisible Size: 749mm x 584mmMaterial: Zinc Electro-Galvanised Mild SteelInsulation: Mineral WoolColour: WhiteU-Value: 0.35W/(Km2)Fire Rated: 1 Hour