supply and exhaust ventilation system of metal circular air duct and trapezoidal box fixed to plastered, yellow-painted facade.

ade air aluminum appliance attached blowing box building circular climate condition conditioning construction cool cooling curved duct engineering equipment exhaust external faasect facade fan fixed form funnel hood industrial installation kitchen life metal networks outdoor part pipe pipeline plaster plastered power roof safe structure supply support system technology temperature trapezoidal tube turbine unit ventilation wall window yellowpainted