Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to block off a heating vent [title] Measure the height and length of the vent. [step] To measure the height of the vent, measure from the bottom edge to the top edge. To measure the length, measure from the left edge of the vent to the right edge.

Ending1: Do not measure more than 1/8 inch. [substeps] Divide the distance between the top and bottom edge by 4. Ending2: [substeps] An easier method is using matching dimensions that are equal to each other. This will ensure that your firewall is as tall as possible. Ending3: [substeps] Write down the measurements you take so you don't forget them. [title] Buy a sheet magnet that's at least as big as the vent. Ending4: This will give you the starting point for blocking out the hot stove. Use a tape measure to find the height and length of the vent, and measure across the vent.

Answer format: ending1/ending2/ending3/ending4