Individual Filters
Buy individually packaged Castle Filters for your home or office. Choose MERV 6 or MERV 8; both will last all year. Backed by our satisfaction guarantee.
MERV 6 or MERV 8?
What’s the difference? Simply put, MERV is a measure of how much dust a filter will catch. Higher MERV, more dust captured. But a higher MERV typically also means lower flow, or how freely air passes through the filter. With a higher MERV you catch more dust, but your system has to work harder. We designed our MERV 8 filter to be an ideal compromise between high-flow and impressive filtration.
However, SOME home A/C systems are under-designed, and require a higher-flowing filter. Owners of these systems will typically use extremely thin woven-fiberglass filters, as they may have found a traditional pleated filter causes their system to run poorly. Our MERV 6 Super-Flow filters are designed as a superior solution for these customers. The filter will provide the highly accessible flow the system needs, while still filtering the air far better than the alternatives.