SIEM 3RT20451AC20 / 3RT2045-1AC20 24VAC 1NO+1NC SCHÜTZ 37KW

SIEM 3RT20451AC20 / 3RT2045-1AC20 24VAC 1NO+1NC SCHÜTZ 37KW

Marsoni

M251S

$142.70

Get it in 3 business days with 1 day shipping. Friday, May 29

SIEM 3RT20451AC20 / 3RT2045-1AC20 24VAC 1NO+1NC SCHÜTZ 37KWSiemens 3RT2045 1AC20 24VAC 1NO+1NC SCHTZ 37KW

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Got this to replace cabin air filter on 2020 Honda Civic Sport, as it said it was a direct fit… It does fit but not perfectly! Holding it next to the filter you can see the size difference, with the original being slightly longer. I noticed a whistling sound from the AC at full blast right after install. I believe this noise is caused by the small gap left in the retainer box with the slightly smaller filter. Luckily it is not incredibly loud, but it’s still there. The quality of filtration seems to be much better than stock filter, but the fitment not exact for vehicles mentioned above.

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Reviewed in the United States on May 17, 2026