.2 ducts less than 0,075 m2 in sectional area other than vertical ducts referred to in subparagraph .1.4.1 shall be constructed of non-combustible materials.

A structure containing one or more vertical or nearly vertical passageways for conveying flue gases to the outside atmosphere.

A structure containing one or more vertical or nearly vertical passageways for conveying flue gases to the outside atmosphere.

.1 ducts not less than 0,075 m2 in sectional area and all vertical ducts serving more than a single between-deck space shall be constructed of steel or other equivalent material

.1 ducts not less than 0,075 m2 in sectional area and all vertical ducts serving more than a single between-deck space shall be constructed of steel or other equivalent material

However, the source rocks of diamonds are vertical pipes filled with igneous rocks.

The flow diversion bands (60) generate a partial blockage of the liquid coolant, which produces a radial flow into one or more of the radial ducts (45), resulting in vertical flow through the internal vertical ducts (30).

The remaining urine and sewage is recovered into the septic tank (13) via gutters (6) and vertical conduits (8).

A plurality of vertical pipes (13a, b) are welded between the tubes (12a, b).

The outermost pipes (13a) and the tubes (12a, b) are connected by means of flanges, to produce gastight membranes.

The air passes through strip heaters (30, 32) within the vertical ducts (26, 28) of the defrost system positioned on either side of the door (8).

The blocks have vertical apertures therethrough and are adapted to be assembled into the walls such that a plurality of vertical ducts are formed in the walls by the apertures of adjacently assembled blocks.

The arrangement comprises a plurality of substantially vertical pipe lines (10) with an inlet end and an outlet end, which are connected to an upper and, respectively, lower chamber (12 and, respectively, 13).

Vertical measurement tube passages (10, 14) into which the liquid in the tank is introduced have a measurement tube (10) and a measurement thin tube (14).

Moreover, one or more than one vertical conduits (10) are further provided that develop from the containment chamber (5) upwards and in fluid communication with the containment chamber (5).