While doing some checks on my DC I noticed a difference in current draw of about 2 amps when all of the blastgates were closed and then one 5" port fully open. That doesn't appear to be much but it can add up in electric cost in a year. So now I'm wondering how much I'm losing due to leakage. The biggest culprit in my system are the blastgates. Anyone else give any thought to this?