Find the topic you need in the online index!

The 2017 National Home Improvement Estimator has a complete cross-referenced index. Find the subject you need in the left column. Then click on the subject link in the right column to jump to the costbook page.

2017 National Home Improvement Estimator

Subject Subject links
Gas furnace 
  counterflowCounterflow gas-fired forced air furnace.  
  exterior wall ductTop of Page 396  
  horizontal flowTop of Page 397  
  interior wall ductTop of Page 396  
  low boyTop of Page 396