Polar Shield™ - Thermally Insulated Iron Doors
With Full Thermal Break and High Efficiency Seals - Because America is Colder than you Think!
Polar Shield™ doors have a full Thermal Break in all parts of the door, plus dual seals in window and threshold.A. 10mm Thermal Break in Jamb
B. 4mm Thermal Break in Stiles and Rails
C. 4mm Thermal Break in Window
D. 4mm Thermal Break in Kick Panel
E. 10mm Thermal Break in Threshold
F. High Efficiency Kerf Seal in Door Stop
G. Dual Seals in Opening Window
H. Dual, Three Bladed, Bottom Sweeps
J. High Density Polyurethane Foam in all cavities.
K. Dual Pane Window with 9mm Argon Gap
All iron doors have a closed cell polyurethane foam core. This helps to stop convection and radiation within the structure but it does NOT stop conduction - which accounts for 90% of heat transfer.
Conduction is the movement of heat through the steel structure itself. Since steel is an excellent heat conductor, over 40 times more conductive than glass, conduction is the most important factor to control. If conduction is not controlled by a thermal break, heat will travel from one side of the door to the other quickly. This is extremely inefficient - regular iron doors have a U Factor of over 4.3!.
Regular iron doors conduct heat so that the inside surface of the door stays about the same temperature as it is outside. In winter these kind of doors can become wet with condensation which will drip onto the floor. This can cause damage to flooring and encourage rot or mold. When it gets colder, these doors can even form frost on the inside!
With a U Factor as low as 0.41, Polar Shield™ doors are the only wrought iron doors suitable for all parts of the USA & Canada.
R Values, U Factors and Lambda Values explained