According to the 2004 amendment to the 2002 Public Health (Tobacco) Act, which I believe is still legally binding, smoking tobacco is prohibited except in certain conditions. Among them are the following:
(7) This section shall not apply to—
(a) a dwelling,
(b) a prison,
(c) subject to paragraph (d), a place or premises, or a part of a place or premises, that is wholly uncovered by any roof, whether fixed or movable,
(d) an outdoor part of a place or premises covered by a fixed or movable roof, provided that not more than 50 per cent of the perimeter of that part is surrounded by one or more walls or similar structures (inclusive of windows, doors, gates or other means of access to or egress from that part),
It is that last portion that I am curious about. In standard mathematical usage, the perimeter of a zone is its linear bound.
So, for instance, under this interpretation, if one side of the space is the entrance to my establishment, and I put a two-foot wall (say) on two of the other three sides, then it is illegal to smoke tobacco in that region?
Contrariwise, perhaps the law is based on surface area instead. If I put up three walls, each of which covers 51% of the region between itself and the roof, is it illegal to smoke tobacco in that region?
Is there some other criterion for the minimum amount a wall must surround on this perimeter? For instance, perhaps a 45% height wall is not considered a wall at all, and so if I have a 90% height wall, and two 49% height walls, in addition to the wall that contains the entrance, smoking can be permitted, even though there are walls on three sides and more than 50% of the total area is covered. If a wall has to go from floor to ceiling, I can easily create a smoking space that is walled in putting in a 6-inch gap, say.
For that matter, is the wall (presumably with an entrance) between the outdoor part and my establishment included in the perimeter, under any of those interpretations?
Which of these meanings, or any other, is at play in Ireland's laws regarding public smoking?