Cibse rules of thumb. Scribd Government Docs. 04.03.2019 Kazigrel 4 Comments Log in. TABLE 2: Cooling loads 2: Search inside document. Nigel Hawkes Fulcrum Consulting. Contact details General enquiries T: Building Regulations Part L 4 was amended for this purpose in and includes provisions for: Rules of Thumb are general principles derived from practice and experience rather than precise theory. TABLE 2: Cooling loads 2: The sources include major design offices.