• 增加通风外墙所需的额外空间和建筑总面积（GFA）可能会挤出现有结构和场地契约。在设计前，必须详细检查。
• 不同材质的通风外墙有不同程度的节能效果。如瓷砖、玻璃纤维强化混凝土板和石材等。
• 为了达到更好的设计效果，应整合排水系统。
• 需要送审改建和加建工程的建筑申请。

QFACADE = [Af*SF*SC*a*(1-F_FIN)(1-F_HANG)(1-F_VENT)]_PRE – [Af*SF*SC*a*(1-F_FIN)(1-F_HING)(1-F_VENT)]_POST

QFACADE = [Ag*SF*SC*min(ESM_FIN, ESM_HANG)]_PRE – [Ag*SF*SC*min(ESM_FIN, ESM_HANG)]_POST+ [Ag*Ug*a*DT_EQ,V+ Asky*Usky*a*DT_EQ,H]_PRE – [Ag*Ug*a*DT_EQ,V+ Asky*Usky*a*DT_EQ,H]_POST+ [Asky*SF*SC]_PRE – [Asky*SF*SC]_POST

kW_FACADE = 1/COP*QFACADE*OPHR,yr

where   Ag = glazing area; Asky = skylight area

                Ug, Usky = U-value of glazing and skylight

SF = solar factor (orientated); SC = shading coefficient

                a = outer surface absorptivity of façade

DT_EQ,V, DT_EQ,H = equivalent temperature different of wall and roof (orientation)

ESM_FIN, ESM_HANG = external shading multiplier of fin and overhang

F_VENT = Heat penetration prevention factor for ventilated façade, it affect U-value of glazing by adding air-insulation, and increase h-value, as well as reducing solar transmission (i.e. SC may change)

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