Furnaces & More |
Cleaning a Furnace
Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. Dirt affects all three basic components of your furnace, so cleaning is the most important part of regular maintenance. The three parts of the furnace should be cleaned: the filter system, the blower, and the motor.
The furnace filter should be replaced or cleaned at the beginning of the heating season and about once a month during periods of continuous use. To check the filter, take it out and hold it up to the light. If it looks clogged, replace it with a new filter of the same type and size regardless of the length of time it has been used.
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A permanent filter is usually sprayed with a special filter-coating chemical, available at hardware stores and home centers. Clean this type of filter according to the manufacturer's instructions, which are usually attached to the furnace housing. Here's how to replace a filter:
Step 1: Look for metal panel on front of furnace below return-air duct, between duct and blower system. Panel may be marked filter, or it may form lid or front of boxlike projection on furnace housing.
Step 2: Slip panel off its holding hooks, or unscrew panel from box or furnace housing. On some heating units, filters are exposed; just slip filter up and out of U-shape tracks that hold it in place.
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Step 3: Inspect and replace or clean filter, depending on type.
Step 4: Clean blower assembly, belts and pulleys to blower, and motor housing. Cleaning blower is critical if furnace has a squirrel-cage fan, because openings in this type of blower often become clogged with dirt. To clean blower, remove panel that covers filter to gain access to blower or panel on front of furnace. This panel may be slip-fit on hooks or held by series of retaining screws. Access to inside of blower is usually gained by sliding out fan unit, which is held on track by screws.
