for w124s that came with no cabin filter (87 300TD), where is the AC intake when in recirc mode? i want to fab a simple filter to control interior dust a bit.

thanks

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project