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Where is the air filter installed in a typical forced-air heating system?

  1. Between the heating unit and the hot-air supply plenum

  2. Between the blower fan and the cold-air return plenum

  3. Inside the hot-air supply plenum

  4. Outside the furnace near the intake

The correct answer is: Between the blower fan and the cold-air return plenum

While all the options mention components of a typical forced-air heating system, they do not accurately describe the location of the air filter. Option A mentions the heating unit and hot-air supply plenum, but the air filter is typically not located between the two. Option C states that the filter is inside the hot-air supply plenum, but it is usually located before the air enters the plenum. Option D mentions the furnace and intake, but the filter is typically not located outside the furnace. Therefore, option B, between the blower fan and the cold-air return plenum, is the most accurate description of where the air filter is installed in a typical forced-air heating system. The air filter is typically placed in this location to remove particles from the air before it is recirculated throughout the house.