Change Furnace Filter In Attic

Look for a filter cabinet along the sides top or bottom of the blower cabinet.

Change furnace filter in attic.

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. Check the filter monthly to see when it needs to be replaced. Actually you should check your filter monthly and often change it monthly depending on the type of filter you use. To determine if it s too dirty remove the filter and hold it up to the light.

Wipe down the area around the slot or filter area with a cloth to remove dust. Dispose of it and replace it with a new filter of the same size when it gets dirty. The general rule is to change a furnace filter usually located behind a return air vent or in a slot on the furnace itself at least once every 90 days. Walk specifically on the floor joists to prevent damage to the ceiling below if.

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

The filter may be positioned horizontally or vertically depending on the orientation of the air handler in the indoor unit. In some cases especially on older models the filter may be found inside the blower cabinet. How to maintain an attic furnace. 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.

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.