Gearbanger 101 said:Ones as good as the other. The SQ has helical cut gears to lessen the typical blower noise associated with all gear driven centrifugals, hence the SQ stands for "Super Quiet". The SQ is "slightly" more efficient because of this, but nothing you'll ever notice.
If you like blower whine, go with the S-Trim.....if you like it quieter, go with the SQ.
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