InterNACHI Exam Study Guide | 238 Questions with 100% Correct Answers | Updated & Verified | 69 Pages

b. end 1 inch above the waste drain line - - - - A condensate line should ______________. a. empty directly into the waste drain line b. end 1 inch above the waste drain line c. not drain into the waste drain line d. extend at least 1 inch into the waste drain line c. is more efficient than conventional furnaces and uses a secondary heat exchanger - - - - A condensing furnace _____________. a. works like an air conditioner, except that it heats instead of cools b. is a furnace covered in condensation c. is more efficient than conventional furnaces and uses a secondary heat exchanger a. 3 - - - - A crawlspace should have one vent at least ______ feet from the corner. a. 3 b. 2 c. 4 d. 1-1/2 a. effective resistance of the wire is increased, so the fuse can no longer adequately protect the wire from overheating - - - - A damaged or nicked wire is a safety hazard because the ___________________.