90% Furnace venting. Posted on August 22, 2012 by Andy. With these higher efficiency furnaces, came some other considerations. The 90% implies that 90% of the heat that is put into the furnace is transferred into the duct system and subsequently into the homes living space leaving only 10% going out the exhaust.
The definition of a direct primary election is when people vote for candidates of their political party by direct vote instead of by delegates at a convention.
There are two kinds of elections in the US. General and Primary. a general election is used to fill an elective office, like mayor or senator. A primary election is one used by political parties to determine a candidate for a specific office, like president.