Heater inlet, to cover or not - Defender Source
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  #1  
Old February 26th, 2015, 11:37 AM
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Heater inlet, to cover or not

What is the consensus of having the heater inlet vent covered or not...does it restrict airflow in thru the cabin? What is the real purpose of the covers?
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  #2  
Old February 26th, 2015, 11:43 AM
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The one in the picture is designed to restrict airflow to make the passengers colder. Although some mistakenly believe it is supposed to produce a "ram" effect, forcing more air through the fan. But since the fan CFM throughput decreases with the increased static pressure caused by sucking through a smaller straw, any benefit is most likely negated.

Oh, and hey, they look cool.



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What is the consensus of having the heater inlet vent covered or not...does it restrict airflow in thru the cabin? What is the real purpose of the covers?
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  #3  
Old February 26th, 2015, 11:58 AM
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They are all restrictive. The stock vent cover itself is restrictive and I have not seen any cover that has as much area as the stock cover.
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Old February 26th, 2015, 12:00 PM
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By stock cover, you mean the flat plastic grille that is on there from the factory?

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They are all restrictive. The stock vent cover itself is restrictive and I have not seen any cover that has as much area as the stock cover.
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Old February 26th, 2015, 12:31 PM
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Yes.
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Old February 28th, 2015, 12:30 AM
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Might be restrictive (all of 'em). I have a mud uk snow cowl and it doesn't make much difference with the original plastic finisher. Major difference is in the longevity of the blower. Less rain/snow means longer life!

------ Follow up post added February 28th, 2015 12:32 AM ------

I know there's a dump valve in the plastic duct... But mist of rain will fly right over it!
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