A new, expanded method for developing angle factors of a person to rectilinear inclined surfaces is presented. The research team analysed the following four cases in order to determine angle factors for inclined surfaces. (1) inclined rectangle in front of the person and above his centre, and behind the person and below his centre, (2) inclined rectangle in front of the person and below his centre, and behind the person and above his centre, (3) inclined rectangle at the side of the person and above and in front of his centre, and at the side of the person, behind and below his centre, (4) inclined rectangle at the side of the person, below and in front of the person's centre, and at the side, above and in back of the person's centre. In cases where the location of the person is known, but not his orientation, a mean value of the angle factor is determined. The method of solution parallels used by Fanger (1982) to generate angle factors for horizontal and vertical surfaces. The combined set of graphs allows for the calculation of the mean radiant temperature in complex enclosures.

KEYWORDS: angle, graphs, inclined, surfaces, calculating, horizontal, vertical, radiating, temperature, thermal comfort, mean radiant temperature