25-inch female NPT inlet and outlet

Is this compatible with non-Fenwal ignition modules

leak-tight shutoff

ensuring it fits standard industrial fan hubs without the need for spacers or adapters

which leads to motor failure

Aprilaire 501 Media 326070-701 25-inch female NPT inlet andOptimize your homes indoor air quality with the Aprilaire 501 Media, a high efficiency replacement solution engineered specifically for the Aprilaire Model 5000 electronic air purifier. This MERV 10 air filter acts as the primary defense against microscopic contaminants, offering performance equivalent to MERV 15 filtration or MERV 16 filtration when integrated with the electronic capabilities of your system. With nominal 16x25x6 furnace filter