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 unitary primary election is held, in which the candidate who receives the majority of the vote wins the mayoral position. If no candidate receives the majority, which happened in 2006, then a runoff election is held for the top two candidates from the unitary primary. In most council-mayor systems, the voters directly vote for the mayor. These elections are usually referred to as at-large elections.