How to determine missing AC and furnace filter size

Questions covered in this video:

  1. How do I determine the size of the AC and furnace filter if it's missing?
  2. What is an intake grill and where is it commonly located?
  3. How do I know if my intake grill is designed for a filter?
  4. What are the steps to open the intake grill?
  5. Where should I measure to find the correct filter size?
  6. What tools do I need to measure the filter size?
  7. Is the thickness of the filter always one inch?
  8. What should I do if I find screws and caulking on the intake grill?
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