Keep your furnace raised up safely 2" off the floor with these handy furnace mounting blocks. Four blocks in a pack, one for each bottom corner of the furnace. Each block has an adhesive surface to quickly attach it to the furnace. Blocks will help your furnace stay dry should water happen to get on the floor. An excellent and inexpensive option for anyone installing a furnace in a basement, or on any floor where water could be present which would cause damage to the furnace. Play it safe with your new furnace investment, and keep it "high-and-dry" with a set of furnace blocks.