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Natural convection
Heat transfer from a warm area of a building to a cold area without mechanical distribution.

Newel
The post at the top or bottom of a staircase that supports the handrail.

Noggin
A short horizontal wooden member between studs.

Non-combustible materials
Materials that do not flame or give off heat when tested to BS476: Part 4 are classified as non-combustible. All timber-based products are combustible in accordance with this method. Non-combustible materials include concrete, calcium silicate board and rock fibre insulation. ...

Nosing
The front edge of a stair tread.