Division 3.3.1 Domestic range hoods with a maximum air flow in any of the available setting higher than 650 m3/h shall automatically revert to an air flow lower than or equal to 650 m3/h in a time tlimit. This is the time limit to extract a volume of air of 100 m3 by the domestic range hood operating with an airflow higher than 650 m3/h, before automatically switching to an airflow of 650 m3/h or lower. It is calculated, expressed in minutes and rounded to the nearest integer as:

See $V=\underset{0}{\overset{t}{\int }}\frac{Q_{\max }}{60}\times \mathrm{dt}$ which can be simplified to $t_{\mathrm{limit}}=\frac{V_{\max }}{Q_{\max }}\times 60$

Where:

• V_max is the maximum volume of air to be extracted, set at 100 m³,

• Q_max is the maximum air flow of the range hood, including intensive/boost mode if present,

• t is the time expressed in minutes and rounded to the nearest integer,

• dt is the total time until the air volume of 100 m³ has been reached,

• t_limit is the time limit, expressed in minutes and rounded to the nearest integer, needed to extract 100 m³.

Words in Annex 2 substituted (31.12.2020) by The Ecodesign for Energy-Related Products and Energy Information (Amendment) (EU Exit) Regulations 2019 (S.I. 2019/539), reg. 1(3), Sch. 2 para. 21(7); 2020 c. 1, Sch. 5 para. 1(1)