When it comes to air filters, the thicker the filter, the less restrictive it is. This means that a 2-inch oven filter allows better airflow than a 1-inch filter. However, these two are not drastically different in thickness. With a 2-inch pleated filter, we have a static pressure of 0.158 WC, which is much better than the 0.25 WC of a 1-inch filter.
A 4-inch filter will last longer and provide better air quality for your home. It has a surface area of 20 to 30 feet with its pleated filter material (accordion). A 4-inch air filter can be changed every 3 to 6 months, while a 1-inch air filter may need to be changed every month. When it comes to improving air quality, filter depth doesn't matter as much as MERV (Minimum Efficiency Reporting Value).
This rating indicates how well an air filter can collect particulates in the air of your home. To get the best results, you should use the correct filter size and not just blindly follow the manufacturer's sizes and use any old filter. In conclusion, if it fits your oven, then a 4-inch air filter is better than a 1-inch air filter when it comes to improving air quality. It will last longer and provide better air quality for your home.
The MERV rating should be used to determine the correct filter size for your needs.