Instapure Double Non-Standard Fiberglass Panel Filters -1′ Diameter (10X10X1) (6-pack). As low as $1.76 per filter

Environet Fiberglass Panel Filters are constructed of moisture resistant industrial grade beverage board frame. The one-piece frame design ensures corner integrity during handling, installation, and operation. The dense and continuous glass is used to ensure maximum filtration.

• Protects HVAC system coils from dirt and dust
• Can be used as a prefilter to extend the life of higher efficiency filters
• Particle – catching adhesive applied to media for greater dust – holding capacity
• Lasts up to 30 days
• MERV 4 rated
• Available in one and two-inch sizes

• High Arrestance – premium grade fiberglass media cleans better than competitive filters
• High Dust Holding Capacity – media coated with light adhesive to increase the number of dirt filters hold
• Frame Strength – a continuous bond between the media and frame maximizes construction strength

1. On your new filter, find the arrow that indicates the proper air flow direction. This tends to confuse everyone more than anything else. That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling. Forced air furnaces recirculate air throughout a home: pushing air (cool or heated) in and pulling spent air back in for another cycle.
2. Slide the new filter in with the arrow pointing toward the furnace, and you are done.

Replacing your air filter is not difficult as long as you understand that air flows from your ducts, through the filter, and into the furnace. The arrow on the filter always should point toward the furnace.