13. Yn rheoliad 42 (profion cyfradd llif awyr awyru mecanyddol)—
(a)yn lle paragraff (1) rhodder—
“(1) This regulation applies where paragraph F1(1) of Schedule 1 imposes a requirement in relation to—
(a)the creation of a new dwelling by building work; or
(b)an existing dwelling which undergoes building work for the provision or extension of any fixed building system for mechanical ventilation.
(1A) Paragraph (1)(b) excludes building work to which Schedule 4 applies.”;
(b)ym mharagraff (2)(b), yn lle “.” rhodder “, other than when Schedules 3 or 4 apply.”
Gwybodaeth Cychwyn
I1Rhl. 13 mewn grym ar 23.11.2022, gweler rhl. 1(3)