1 Around plumbing vent stack

2 Attic hatch

3 Tops of interior walls

4 Recessed light

5 Behind built-in cabinets

6 Around door

7 Plumbing penetrations

8 Around bathtub

9 Sill plate

10 Around chimneys and flues

11 Fireplace damper

12 Furnace or air conditioner air handler box

13 Where additions join house

14 Around window

15 Behind baseboards

16 Around electrical sockets

17 Around duct boot and register

18 Ducts

19 Around dryer vent