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.
A state's primary election or caucus usually is an indirect election: instead of voters directly selecting a particular person running for President, it determines how many delegates each party's national convention will receive from their respective state.uper Tuesday is the Tuesday in February or March when the greatest number of states hold primary elections. Because it is held in various states from geographically and socially diverse regions of the country, it typically represents a presidential candidate's first test of national electability.