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.
TYPES OF U.S. ELECTIONS. There are two basic types of elections: primary and general. Primary elections are held prior to a general election to. determine party candidates for the general election. The. winning candidates in the primary go on to represent that. party in the general election (although there may be a.