Unfortunately, there isn't a universal type or size of filter. While there are many common sizes, often times, the size of your air filter is determined by the installers and are not determined by the brand of furnace or air conditioner installed in your home. The only reliable way to know the size of filter you need is to physically remove and measure your filter.
Step 1: Locate Existing Filter (See "Changing your Air Filter" for more specific instructions)
Your furnace is typically located in the garage or sometimes installed in a central area close to water heater.

Step 2: Remove Filter
Step 3: Measure Filter

Note: Physical size of filter vs. Nominal size. Expect about a 1/2 Inch difference in actual size.
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