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.
1 A few states allow voters to choose the party primary in which they want to vote on primary election day â a process known as open primaries. 2  Primaries are usually held in the spring before the general election in the fall. 3  General Elections. A few states allow voters to choose the party primary in which they want to vote on primary election day â a process known as open primaries. 2  Primaries are usually held in the spring before the general election in the fall. 3  General Elections.