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Rectangular-K27 Duct and Fittings Dimensions: Table 1 by Shaun Sullivan is a document available to read on EtoBox.

McGill AirFlow Corporation manufactures double-wall insulated rectangular duct and fittings. The ducts and fittings are constructed with an inner and outer metal shell separated by fiberglass insulation. Standard insulation thicknesses are 1, 2, or 3 inches and materials include galvanized steel, stainless steel, and aluminum.

Author
Shaun Sullivan
Language
EN