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The BMW Range
3 Series
E90, E91, E92, E93
Recirculated-air mode
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<blockquote data-quote="astroboy" data-source="post: 649971" data-attributes="member: 4527"><p>Jap cars if come with cabin filter, it will be located in front of the cooling coil under the dash. On the contrary, BMW microfilter is located in the engine compartment under the wiper to clean in coming external air and will not help if on internal circulation mode. And of course, the door seals in BMW is much secured than Japs cars so allowing external air in to freshen up the cabin air is important to reduce the CO2 level in the cabin. Too much CO2, driver will feel tired and doze off.. very dangerous.</p><p></p><p>It's just different design philosophy.</p></blockquote><p></p>
[QUOTE="astroboy, post: 649971, member: 4527"] Jap cars if come with cabin filter, it will be located in front of the cooling coil under the dash. On the contrary, BMW microfilter is located in the engine compartment under the wiper to clean in coming external air and will not help if on internal circulation mode. And of course, the door seals in BMW is much secured than Japs cars so allowing external air in to freshen up the cabin air is important to reduce the CO2 level in the cabin. Too much CO2, driver will feel tired and doze off.. very dangerous. It's just different design philosophy. [/QUOTE]
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The BMW Range
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Recirculated-air mode
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