Foil Faced Insulation: Foil with Foam Bubble or Fiberglass
In CASE 1 the enclosing walls are paper wood asbestos or other material. In CASE 2 the walls are lined with aluminum foil. In CASE 3 two sheets of aluminum are used to divide the enclosure into three 1/2 spaces. Note: 65% (206) BTU's of the total BTU's going through the wall space is radiation. *Note: Aluminum has 3% to 5% emissivity.
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