Change Furnace Filter In Attic

Dispose of it and replace it with a new filter of the same size when it gets dirty.

Change furnace filter in attic.

The arrows indicate that air is being pulled into the register air handler so make sure the arrows point into the system not towards the house. Turn off the furnace s power at the circuit breaker on the main electrical panel. If you click on and enlarge the image you may see a black bolt or screw at the top of the air filter slot cover remove this to lift the filter slot cover up and out. The filter may be positioned horizontally or vertically depending on the orientation of the air handler in the indoor unit.

Actually you should check your filter monthly and often change it monthly depending on the type of filter you use. Access the attic furnace. How to maintain an attic furnace. Look for a filter cabinet along the sides top or bottom of the blower cabinet.

In some cases especially on older models the filter may be found inside the blower cabinet. Wipe down the area around the slot or filter area with a cloth to remove dust. Look for a filter slot right where the return plenum contacts the blower fan assembly marked as air filter slot and yellow arrow in my photo. If you re thinking that you only have to change your filter once a year you may well be shortening the life of your furnace.

To determine if it s too dirty remove the filter and hold it up to the light. Apply a non contact circuit tester to the furnace to verify. Changing a home furnace filter regularly is the fastest and easiest way to make sure your furnace is running smoothly and efficiently as well as to help purify the air in your home. Walk specifically on the floor joists to prevent damage to the ceiling below if.

Fit in the new filter by following the direction of arrows printed on the filter see image below.