Since we’re inside with doors and windows closed for most of the winter it’s important to keep the furnace filters clean and clear of dust and other debris.

因为在冬天的大多数时候都会紧闭门窗，所以保持暖气过滤网干净、清洁、没有灰尘和碎石是很重要的。

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Since we're inside with doors and Windows closed for most of the winter it's important to keep the furnace filters clean and clear of dust and other debris.

因为在冬天的大多数时候都会紧闭门窗，所以保持暖气过滤网干净、清洁、没有灰尘和碎石是很重要的。

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The ends of the tubular furnace are closed to minimize convection currents inside the furnace.

把管式炉的前后端盖紧，是炉内的对流减少到最低限度。

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