When To Replace My Filter?

One inch furnace filter should be changed after one month, 4 inches House Air Filters after 3 months.
Certain conditions in your home will significantly add particles to the air. this will cause the filter to capture more particles than usual, shortening its life to less then 3 months or reducing the effectiveness of the ventilation filter to capture particles.

These conditios include:

• Dirty ductwork
• Pets
• Construction Work
• Burning Candles
• Tobacco Smoke
• Fireplace and Wood-burning stove Smoke

Also, running your furnace or air conditioning fan continuously will help clean the air in your home but could further shorten the life of the filter.

Read When to Replace your Furnace Filter