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.
Variations in direct primary elections are characterized by which voters are eligible to vote in the partyâs primary. One can distinguish between closed, open, blanket (crossover), and nonpartisan primaries. However, there are some general features that all primaries have in common in the US.