BCAB #1064 - Ventilation of Dwelling Units, Table 9.33.3.B.
May 10, 1989
Re: Ventilation of Dwelling Units, Table 9.33.3.B.
With reference to your letter of April 17, 1989 regarding ventilation fan capacity.
Your assumption that a house exceeding 400 square metres in total floor area only needs a fan of 40 L/s capacity, is incorrect. Table 9.33.3.B. provides the minimum portion of the ventilation rate required to be controlled automatically; the total ventilation rate is provided in Table 9.33.3.A.
J.C. Currie, Chair