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.
Indirect election. Indirect election is a process in which voters in an election do not choose between candidates for an office, but rather elect persons who will then make the choice. It is one of the oldest forms of elections and is still used today for many upper houses and presidents.