Abstract: A corrugated metal vent pipe includes a helically corrugated pipe structure formed by helical winding of a corrugated metal strip, wherein the helically corrugated pipe structure has a diameter of between 15 inches and 36 inches and a plurality of vent openings distributed thereon. A first pipe end treatment is located on a first end of the helically corrugated pipe structure, and a second pipe end treatment is located on a second end of the helically corrugated pipe structure.

Abstract: A corrugated metal vent pipe includes a helically corrugated pipe structure formed by helical winding of a corrugated metal strip, wherein the helically corrugated pipe structure has a diameter of between 15 inches and 36 inches and a plurality of vent openings distributed thereon. A first pipe end treatment is located on a first end of the helically corrugated pipe structure, and a second pipe end treatment is located on a second end of the helically corrugated pipe structure.

Abstract: A mailer type business form is constructed from an intermediate having a plurality of pressure activated cohesive cooperating patterns, and a card is mounted on or with the intermediate. Despite the fact that a card is included, because of the provision of surface manifestations in the intermediate, and/or because of the relative thicknesses of the card and the intermediate, the mailer may be sealed by steam rolling rather than requiring selective edge sealing. A surface manifestation may comprise a cutout with a patch, or a folded over portion of the intermediate, retaining the card with the intermediate during processing. Alternatively, first and second thinned portions of the sheet of paper, disposed on opposite sides of a fold line so as to cooperate and hold the card when the sheet is folded about the fold line, may be provided, the thinned portions provided by embossing, for example.

Abstract: A mailer type business form is constructed from an intermediate having a plurality of pressure activated cohesive cooperating patterns, and a card is mounted on or with the intermediate. Despite the fact that a card is included, because of the provision of surface manifestations in the intermediate, and/or because of the relative thicknesses of the card and the intermediate, the mailer may be sealed by steam rolling rather than requiring selective edge sealing. A surface manifestation may comprise a cutout with a patch, or a folded over portion of the intermediate, retaining the card with the intermediate during processing. Alternatively, first and second thinned portions of the sheet of paper, disposed on opposite sides of a fold line so as to cooperate and hold the card when the sheet is folded about the fold line, may be provided, the thinned portions provided by embossing, for example.