Single layer fire barrier wrap for grease ducts

A single-layer duct wrap, comprising:

• a sequence of sheets comprising;
• two fiber insulation-blanket sheets;
• two metal foil sheets, and
• a protective cloth or an intumescent mat sheet,
• a laminate sheet,
• said protective cloth or intumescent mat sheet sandwiched between said two foil sheets forming an inner sheet sequence,
• said inner sheet sequence sandwiched between said two fiber insulation-blanket sheets,
• said three-ply laminate sheet encasing and sealing using metal foil tape said sequence of sheets within itself forming a single-layer duct wrap.

A single-layer duct wrap, comprising:

• a sequence of sheets comprising;
• two fiber insulation-blanket sheets;
• one aluminum sheet or stainless steel foil sheet, and
• a laminate sheet comprising:
• an aluminum foil backing ply;
• a fiberglass scrim ply, and
• an aluminized polyester face ply,
• said fiberglass scrim ply between said aluminum foil backing ply and said aluminized polyester face ply,
• said foil sheet sandwiched between said two fiber insulation-blanket sheets,
• said laminate sheet encasing and sealing using metal foil tape said sequence of sheets within itself forming a single-layer duct wrap.

A single-layer duct wrap, as recited in claim 19, wherein said sequence of sheets comprises an additional:

• aluminum or stainless steel foil sheet, and
• a protective cloth or an intumescent mat sheet,
• said protective cloth or intumescent mat sheet sandwiched between said two aluminum or stainless steel foil sheets forming an inner-sheet sequence,
• said inner-sheet sequence sandwiched between said two fiber insulation-blanket sheets,
• said laminate sheet encasing and sealing using metal foil tape said sequence of sheets within itself forming a single-layer duct wrap.