Q. How do I change a furnace filter?
1. Turn the power OFF to the furnace or air handler. You do not want the system fan operating since a tremendous amount of dust can be dislodged when changing a filter. This will avoid any debris from being directly sucked into your HVAC system.
2. Find the AIR FLOW arrow that will show you which directions the filter should be inserted. Most filters are made in such a way that they can only be inserted one way into their slot or air cleaner cabinet. Often, a rigid scrim or wire mesh is inserted on the downstream side of the filter to give the filter the strength and rigidity it needs to do its job properly. The downstream side of the filter is the last surface the air touches and should face the blower of your HVAC system.
3. The act should be as simple as sliding the old one out and sliding a new one in its place. However, some HVAC systems may require you to remove a slot cover or air cleaner door. Other air cleaners, such as the popular Aprilaire/Space-Gard 2200 and 2400, may need to have their new filters assembled before replacing.