flue resistance

例句：

1. 1. The design of the flue must be optimized to reduce the resistance.
   必须优化烟道设计以减少阻力。
2. 2.The flue resistance is a critical factor in determining the efficiency of the heating system.
   烟道阻力是决定加热系统效率的关键因素。
3. 3.The manufacturer has introduced a new model with reduced flue resistance for better energy efficiency.
   制造商推出了一款具有更低烟道阻力的新型号，以提高能源效率。