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feature


doors, windows, glazing & hardware how steel


doorsets support thermal performance


Yann Fontanet, Research & Development Engineer at Robust UK, explains how doors  performance requirements...


While windows, walls and roofs often receive the most attention when improving thermal performance, doors can also contribute to heat loss and unwanted draughts. Choosing the right door can help create a more comfortable indoor environment, reduce energy demand and support wider performance requirements Why doors matter in improving thermal performance Achieving good thermal performance in a building requires a collective approach. Walls, roofs, windows and doors should be considered together to create a more


thermally efficient space. There are several reasons why doors should be considered when improving a building’s thermal performance, from reducing energy demand to improving comfort. Doors are often treated as access points or security features; however, they can affect the building’s overall performance. Because doors with low thermal transmittance (U-value) slow the rate at which heat passes through the door leaf, they help retain warmth during colder months and reduce unwanted heat gain during warmer months.


Gaps around the door leaf and frame can also limit uncontrolled air movement, preventing air leakage, lowering the energy needed to maintain indoor temperatures and reducing draughts that can create cold spots. A low thermal transmittance steel door


with mineral wool insulation helps control indoor temperatures. A U-value is assigned following testing of the entire doorset, which includes door construction material, insulation, seals and components, to measure heat loss. Mineral wool insulation helps steel doors


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