Quote:
Originally Posted by AC_Hacker
PS: Next is fans
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I've read that centrifugal or crossflow fans are most efficient for household ventilation. Also, they should be DC powered:
- AC powered fans "hum" at the grid's frequency and may cause the whole installation to vibrate,
- AC fans can cause electromechanical interference,
- DC can be easily tied into an RE or back-up power installation.